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rev.4.2 _01 step-up, super-small package, 600 khz, pwm control or pw m/pfm switchable switching regula tor controller s-8355/56/57/58 series seiko instruments inc. 1 the s-8355/56/57/58 series is a cm os step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a pwm control circuit (s-8355/57 series) and a pwm/pfm switching control circuit (s-8356/58 series). with an external low-on-resistance nch power mos, this product is ideal for applications requiring high efficiency and a high output current. the s-8355/57 series realizes low ripple, high efficiency, and excellent transient characteristics due to its pwm control circuit whose duty ratio can be varied linearly from 0 to 83% (from 0 to 78% for 250 khz, 300 khz, and 600 khz models), an excellently designed error amplifier and a phase compensation circuits. s-8356/58 series features a pwm/pf m switching controller that can switch the operation to a pfm controll er with a duty ratio is 15% under a light load to prevent a decline in the efficiency due to the ic operating current. ? features ? low voltage operation : startup at 0.9 v min. (i out = 1 ma) guaranteed ? low current consumption : during operation 25.9 a (3.3 v, 100 khz, typ.) during shutdown 0.5 a (max.) ? duty ratio : built-in pwm/pfm switching control circuit (s-8356/58 series) 15 to 83% (100 khz models) 15 to 78% (250 khz, 300 khz, and 600 khz models) ? external parts : coil, diode, capacitor, and transistor ? output voltage : selectable in 0.1 v steps between 1.5 and 6.5 v (for v dd / v out separate types) selectable in 0.1 v steps between 2.0 and 6.5 v (for other than v dd / v out separate types) ? output voltage accuracy : 2.4% ? oscillation frequency : 100 khz, 250 khz, 300 khz, 600 khz selectable ? soft start function : 6 ms (100 khz, typ.) ? shutdown function ? applications ? power supplies for portable equipment such as digital cameras, electronic notebooks, and pdas ? power supplies for audio equipment such as portable cd / md players ? constant voltage power supplies for cameras, vcrs, and communications devices ? power supplies for microcomputers ? packages drawing code package name package tape reel sot-23-3 mp003-a mp003-a mp003-a sot-23-5 mp005-a mp005-a mp005-a sot-89-3 up003-a up003-a up003-a 6-pin snb(b) bd006-a bd006-a bd006-a
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 2 ? block diagrams (1) s-8357/58 series b, h and f types (without shutdown function) (2) s-8357/58 series b, h, f and n types (with shutdown function) vout ext vss pwmcontrol circuit or pwm / pfm swiching control circuit oscillation circuit soft start built-in reference power supply phase compensation circuit ic internal power supply + ? vout vss ext phase compensation circuit soft start built-in reference power supply pwmcontrol circuit or pwm / pfm swiching control circuit oscillation circuit off / on ic internal power supply + ? figure 1 figure 2 (3) s-8357/58 series e, j, g and p types (v dd / v out separate type) (4) s-8355/56 series k, l, m and q types (with shutdown function, v dd / v out separate type) ext vss oscillation circuit pwmcontrol circuit or pwm / pfm swiching control circuit soft start built-in reference power supply vout vdd phase compensation circuit ic internal power supply + ? ext vdd vout vss oscillation circuit pwmcontrol circuit or pwm / pfm swiching control circuit + ? soft start built-in reference power supply phase compensation circuit ic internal power supply off / on figure 3 figure 4
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 3 ? product name structure the control system, product types, out put voltage, and packages for the s-8355/ 56/57/58 series can be selected at the user?s request. please refer to the ? 3. product name ? for the definition of the product name and ? 4. product name list ? for the full product names. 1. function list (1) pwm control products table 1 product name switching frequency khz shutdown function v dd / v out separate type package application s-8355kxxmc 100 yes yes sot-23-5 applications requiring variable output voltage and a shutdown function s-8355lxxmc, s-8355lxxbd 250 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8355mxxmc, s-8355mxxbd 300 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8355qxxmc, s-8355qxxbd 600 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8357bxxmc 100 yes ? sot-23-5 applications requiring a shutdown function s-8357bxxma 100 ? ? sot-23-3 applications not requiring a shutdown function s-8357bxxua 100 ? ? sot-89-3 applications not requiring a shutdown function s-8357exxmc 100 ? yes sot-23-5 applications in which output voltage is adjusted by external resistor s-8357fxxmc, s-8357fxxbd 300 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8357gxxmc, s-8357gxxbd 300 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage and a thin coil s-8357hxxmc, s-8357hxxbd 250 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8357jxxmc, s-8357jxxbd 250 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage with an external resistor and a thin coil s-8357nxxmc, s-8357nxxbd 600 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8357pxxmc, s-8357pxxbd 600 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage with an external resistor and a thin coil
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 4 (2) pwm / pfm switching control products table 2 product name switching frequency khz shutdown function v dd / v out separate type package application s-8356kxxmc 100 yes yes sot-23-5 applications requiring variable output voltage and a shutdown function s-8356lxxmc, s-8356kxxbd 250 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8356mxxmc, s-8356mxxbd 300 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8356qxxmc, s-8356qxxbd 600 yes yes sot-23-5, 6-pin snb(b) applications requiring va riable output voltage, a shutdown function, and a thin coil s-8358bxxmc 100 yes ? sot-23-5 applications requiring a shutdown function s-8358bxxma 100 ? ? sot-23-3 applications not requiring a shutdown function s-8358bxxua 100 ? ? sot-89-3 applications not requiring a shutdown function s-8358exxmc 100 ? yes sot-23-5 applications in which output voltage is adjusted by external resistor s-8358fxxmc, s-8358fxxbd 300 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8358gxxmc, s-8358gxxbd 300 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage and a thin coil s-8358hxxmc, s-8358hxxbd 250 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8358jxxmc, s-8358jxxbd 250 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage with an external resistor and a thin coil s-8358nxxmc, s-8358nxxbd 600 yes ? sot-23-5, 6-pin snb(b) applications requiring a shutdown function and a thin coil s-8358pxxmc, s-8358pxxbd 600 ? yes sot-23-5, 6-pin snb(b) applications requiring variable output voltage with an external resistor and a thin coil 2. package and function list by product type table 3 series name type package name (abbreviation) shutdown function yes / no v dd / v out separate type yes / no s-8355 series, s-8356 series k, l, m, q (shutdown function + v dd / v out separate type) k = 100 khz, l = 250 khz, m = 300 khz, q = 600 khz mc / bd yes yes ma / ua no s-8357 series b, h, f (normal product) b = 100 khz, h = 250 khz, f = 300 khz mc / bd yes no n (normal product) n = 600 khz mc / bd yes no e, j, g, p (v dd / v out separate type) e = 100 khz, j = 250 khz, g = 300 khz, p = 600 khz mc / bd no yes ma / ua no s-8358 series b, h, f (normal product) b = 100 khz, h = 250 khz, f = 300 khz mc / bd yes no n (normal product) n = 600 khz mc/bd yes no e, j, g, p (v dd / v out separate type) e = 100 khz, j = 250 khz, g = 300 khz, p = 600 khz mc / bd no yes
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 5 3. product name s-835 x x xx xx - xxx - tx ic direction in tape specifications *1 t2 : sot-23-3, sot-23-5, sot-89-3 tf : 6-pin snb(b) product code *2 package code ma : sot-23-3 mc : sot-23-5 ua : sot-89-3 bd : 6-pin snb(b) output voltage 15 to 65 (e.g. when the output voltage is 1.5 v, it is expressed as 15.) product type b : normal product, f osc = 100 khz (s-8357/58 series) h : normal product, f osc = 250 khz (s-8357/58 series) f : normal product, f osc = 300 khz (s-8357/58 series) n : normal product, f osc = 600 khz (s-8357/58 series) e : v dd / v out separate type, f osc = 100 khz (s-8357/58 series) j : v dd / v out separate type, f osc = 250 khz (s-8357/58 series) g : v dd / v out separate type, f osc = 300 khz (s-8357/58 series) p : v dd / v out separate type, f osc = 600 khz (s-8357/58 series) k : with shutdown function + v dd / v out separate type, f osc = 100 khz (s-8355/56 series) l : with shutdown function + v dd / v out separate type, f osc = 250 khz (s-8355/56 series) m : with shutdown function + v dd / v out separate type, f osc = 300 khz (s-8355/56 series) q : with shutdown function + v dd / v out separate type, f osc = 600 khz (s-8355/56 series) control system 5 or 7 : pwm control 6 or 8 : pwm / pfm switching control *1. refer to the taping specifications. *2. refer to the table 4 to table 13 in the ? 4. product name list ?.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 6 4. product name list (1) s-8355 series table 4 output voltage s-8355kxxmc series s-8355lxxmc series s-8355mxxmc series s-8355mxxbd series 1.5 v ? s-8355l15mc-nca-t2 ? ? 1.8 v s-8355k18mc-nad-t2 ? s-8355m18mc-mcd-t2 s-8355m18bd-mcd-tf 2.0 v s-8355k20mc-naf-t2 s-8355l20mc-ncf-t2 s-8355m20mc-mcf-t2 ? 3.1 v s-8355k31mc-naq-t2 ? s-8355m31mc-mcq-t2 ? 3.2 v ? ? s-8355m32mc-mcr-t2 ? 3.3 v s-8355k33mc-nas-t2 ? ? ? 3.4 v ? ? s-8355m34mc-mct-t2 s-8355m34bd-mct-tf 5.0 v s-8355k50mc-nbj-t2 ? s-8355m50mc-mdj-t2 ? 5.5 v ? ? s-8355m55mc-mdo-t2 ? remark please contact the sii marketing department for products with an output voltage other than those specified above. table 5 output voltage s-8355qxxmc series s-8355qxxbd series 1.5 v s-8355q15mc-owa- t2 s-8355q15bd-owa-tf 2.8 v ? s-8355q28bd-own-tf 3.1 v ? s-8355q31bd-owq-tf 3.4 v ? s-8355q34bd-owt-tf 5.0 v s-8355q50mc-oxj-t2 s-8355q50bd-oxj-tf remark please contact the sii marketing department for products with an output voltage other than those specified above. (2) s-8356 series output voltage s-8356kxxmc series s-8356mxxmc series s-8356mxxbd series 1.5 v ? s-8356m15mc-mea-t2 ? 1.8 v s-8356k18mc-ned-t2 s-8356m18mc-med-t2 s-8356m18bd-med-tf 3.0 v ? s-8356m30mc-mep-t2 ? 3.3 v s-8356k33mc-nes-t2 ? ? 5.0 v s-8356k50mc-nfj-t2 s-8356m50mc-mfj-t2 s-8356m50bd-mfj-tf remark please contact the sii marketing department for products with an output voltage other than those specified above. table 7 output voltage s-8356qxxmc series s-8356qxxbd series 1.8 v s-8356q18mc-oyd-t2 ? 3.3 v s-8356q33mc-oys-t2 ? 3.7 v ? s-8356q37bd-oyw-tf 5.0 v s-8356q50mc-ovj-t2 s-8356q50bd-ovj-tf remark please contact the sii marketing department for products with an output voltage other than those specified above.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 7 (3) s-8357 series table 8 output voltage s-8357bxxmc series s-8357bxxma series s-8357bxxua series s-8357exxmc series 1.5 v ? ? ? s-8357e15mc-nka-t2 2.0 v ? ? ? s-8357e20mc-nkf-t2 2.5 v s-8357b25mc-nik-t2 ? ? ? 2.6 v s-8357b26mc-nil-t2 ? ? ? 2.7 v s-8357b27mc-nim-t2 ? ? ? 2.8 v s-8357b28mc-nin-t2 ? ? ? 3.0 v s-8357b30mc-nip-t2 s-8357b30ma-nip-t2 ? ? 3.3 v s-8357b33mc-nis-t2 s-8357b33ma-nis-t2 s-8357b33ua-nis-t2 ? 3.6 v s-8357b36mc-niv-t2 ? ? ? 4.8 v s-8357b48mc-njh-t2 ? s-8357b48ua-njh-t2 ? 5.0 v s-8357b50mc-njj-t2 s-8357b50ma-njj-t2 s-8357b50ua-njj-t2 s-8357e50mc-nlj-t2 5.2 v s-8357b52mc-njl-t2 ? ? ? 5.4 v s-8357b54mc-njn-t2 ? ? ? 6.0 v s-8357b60mc-njt-t2 ? ? ? remark please contact the sii marketing department for products with an output voltage other than those specified above. table 9 output voltage s-8357fxxmc series s-8357gxxmc series s-8357hxxmc series s-8357jxxmc series 2.5 v ? ? ? s-8357j25mc-nok-t2 3.0 v ? ? s-8357h30mc-nmp-t2 ? 3.1 v ? ? s-8357h31mc-nmq-t2 ? 3.2 v s-8357f32mc-mgr-t2 ? ? ? 3.3 v s-8357f33mc-mgs-t2 ? ? ? 3.5 v ? ? s-8357h35mc-nmu-t2 ? 3.6 v ? ? s-8357h36mc-nmv-t2 ? 5.0 v s-8357f50mc-mhj-t2 s-8357g50mc-mjj- t2 s-8357h50mc-nnj-t2 s-8357j50mc-npj-t2 5.2 v s-8357f52mc-mhl-t2 ? ? ? remark please contact the sii marketing department for products with an output voltage other than those specified above. table 10 output voltage s-8357jxxbd series s-8357nxxmc series 3.3 v ? s-8357n33mc-o2s-t2 5.0 v s-8357j50bd-npj-tf s-8357n50mc-o3j-t2 remark please contact the sii marketing department for products with an output voltage other than those specified above.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 8 (4) s-8358 series table 11 output voltage s-8358bxxmc series s-8358bxxma series s-8358bxxua series s-8358exxmc series 2.0 v ? ? ? s-8358e20mc-nsf-t2 2.3 v s-8358b23mc-nqi-t2 ? ? ? 2.5 v s-8358b25mc-nqk-t2 ? ? ? 2.6 v s-8358b26mc-nql-t2 ? ? ? 2.7 v s-8358b27mc-nqm-t2 ? ? ? 3.0 v s-8358b30mc-nqp-t2 ? ? ? 3.1 v s-8358b31mc-nqq-t2 ? ? ? 3.2 v s-8358b32mc-nqr-t2 ? ? ? 3.3 v s-8358b33mc-nqs-t2 ? s-8358b33ua-nqs-t2 ? 3.5 v s-8358b35mc-nqu-t2 ? ? ? 3.6 v s-8358b36mc-nqv-t2 ? ? ? 3.8 v s-8358b38mc-nqx-t2 ? ? ? 4.0 v s-8358b40mc-nqz-t2 ? ? ? 5.0 v s-8358b50mc-nrj-t2 s-8358b50ma-nrj-t 2 s-8358b50ua-nrj-t2 s-8358e50mc-ntj-t2 6.0 v s-8358b60mc-nrt-t2 ? ? ? remark please contact the sii marketing department for products with an output voltage other than those specified above. table 12 output voltage s-8358fxxmc series s-8358gxxmc series s-8358hxxmc series s-8358jxxmc series 2.3 v ? ? s-8358h23mc-nui-t2 ? 2.6 v s-8358f26mc-mkl-t2 ? ? ? 2.7 v s-8358f27mc-mkm-t2 ? ? ? 3.0 v ? ? s-8358h30mc-nup-t2 ? 3.3 v s-8358f33mc-mks-t2 ? s-8358h33mc-nus-t2 s-8358j33mc-nws-t2 5.0 v s-8358f50mc-mlj-t2 s-8358g50mc-mnj-t2 s-8358h50mc-nvj-t2 s-8358j50mc-nxj-t2 5.3 v s-8358f53mc-mlm-t2 ? ? ? remark please contact the sii marketing department for products with an output voltage other than those specified above. table 13 output voltage s-8358nxxmc series 5.3 v s-8358n53mc-o7m-t2 remark please contact the sii marketing department for products with an output voltage other than those specified above.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 9 ? pin configurations table 14 s-8357/58 series b, h and f types (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vout output voltage pin and ic power supply pin 2 vss gnd pin 3 ext external transistor connection pin 1 3 2 sot-23-3 top view figure 5 table 15 s-8355/56 series k, l, m and q types (with shutdown function, v dd / v out separate type) pin no. symbol pin description 1 vout output voltage 2 vdd ic power supply pin 3 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (entire circuit stopped) 4 vss gnd pin sot-23-5 top view 5 4 3 2 1 5 ext external transistor connection pin figure 6 table 16 s-8357/58 series b, h, f and n types (with shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (entire circuit stopped) 2 vout output voltage pin and ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 ext external transistor connection pin *1. the nc pin indicates electrically open. table 17 s-8357/58 series e, j, g and p types (without shutdown function, v dd / v out separate type) pin no. symbol pin description 1 vout output voltage pin 2 vdd ic power supply pin 3 nc *1 no connection 4 vss gnd pin 5 ext external transistor connection pin *1. the nc pin indicates electrically open.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 10 table 18 s-8357/58 series b, h and f types (without shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 vss gnd pin 2 vout output voltage pin and ic power supply pin 3 ext external transistor connection pin sot-89-3 top view 3 2 1 figure 7 table 19 s-8355/56 series k, l, m and q types (with shutdown function, v dd / v out separate type) pin no. symbol pin description 1 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (entire circuit stopped) 2 vout output voltage pin 3 vdd ic power supply pin 4 ext external transistor connection pin 5 nc *1 no connection 6 vss gnd pin *1. the nc pin indicates electrically open. table 20 s-8357/58 series b, h, f and n types (with shutdown function, v dd / v out non-separate type) pin no. symbol pin description 1 nc *1 no connection 2 off / on shutdown pin ?h?: normal operation (step-up operating) ?l?: step-up stopped (entire circuit stopped) 3 vout output voltage pin and ic power supply pin 4 ext external transistor connection pin 5 nc *1 no connection 6 vss gnd pin *1. the nc pin indicates electrically open. 6-pin snb(b) top view 6 5 4 1 2 3 4 5 6 3 2 1 bottom view *1 *1. connect the heatsink of back side at shadowed area to the board, and set electric potential open or vdd. however, do not use it as the function of electrode. figure 8 table 21 s-8357/58 series e, j, g and p types (without shutdown function, v dd / v out separate type) pin no. symbol pin description 1 nc *1 no connection 2 vout output voltage pin 3 vdd ic power supply pin 4 ext external transistor connection pin 5 nc *1 no connection 6 vss gnd pin *1. the nc pin indicates electrically open.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 11 ? absolute maximum ratings table 22 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit vout pin voltage v out v ss ? 0.3 to v ss + 12 v off / on pin voltage *1 off / on v v ss ? 0.3 to v ss + 12 v vdd pin voltage *2 v dd v ss ? 0.3 to v ss + 12 v ext pin voltage b, h, f, n type v ext v ss ? 0.3 to v dd + 0.3 v others v ss ? 0.3 to v out + 0.3 v ext pin current i ext 80 ma power dissipation sot-23-3 p d 150 mw sot-23-5 250 mw sot-89-3 500 mw 6-pin snb(b) 90 mw operating ambient temperature topr ? 40 to + 85 c storage temperature tstg ? 40 to + 125 c *1. with shutdown function *2. for v dd / v out separate type caution the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions. sot-23-3 sot-89-3 sot-23-5 6-pin snb(b) 600 400 0 power dissipation (p d ) [mw] 200 0 50 100 150 a mbient tem p erature ( ta ) [ c ] figure 9 power dissipation of the packages (before mounting)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 12 ? electrical characteristics (1) 100 khz product (b, e and k types) table 23 (1 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx15 to 19 ? 14.0 23.4 a 1 s-835xx20 to 29 ? 19.7 32.9 a 1 s-835xx30 to 39 ? 25.9 43.2 a 1 s-835xx40 to 49 ? 32.6 54.4 a 1 s-835xx50 to 59 ? 39.8 66.4 a 1 s-835xx60 to 65 ? 47.3 78.9 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx15 to 19 ? 5.6 11.1 a 1 s-835xx20 to 29 ? 5.8 11.5 a 1 s-835xx30 to 39 ? 5.9 11.8 a 1 s-835xx40 to 49 ? 6.1 12.1 a 1 s-835xx50 to 59 ? 6.3 12.5 a 1 s-835xx60 to 65 ? 6.4 12.8 a 1 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 1 ext pin output current i exth v ext = v out ? 0.4 v s-835xx15 to 19 ? 4.5 ? 8.9 ? ma 1 s-835xx20 to 24 ? 6.2 ? 12.3 ? ma 1 s-835xx25 to 29 ? 7.8 ? 15.7 ? ma 1 s-835xx30 to 39 ? 10.3 ? 20.7 ? ma 1 s-835xx40 to 49 ? 13.3 ? 26.7 ? ma 1 s-835xx50 to 59 ? 16.1 ? 32.3 ? ma 1 s-835xx60 to 65 ? 18.9 ? 37.7 ? ma 1 i extl v ext = 0.4 v s-835xx15 to 19 9.5 19.0 ? ma 1 s-835xx20 to 24 12.6 25.2 ? ma 1 s-835xx25 to 29 15.5 31.0 ? ma 1 s-835xx30 to 39 19.2 38.5 ? ma 1 s-835xx40 to 49 23.8 47.6 ? ma 1 s-835xx50 to 59 27.4 54.8 ? ma 1 s-835xx60 to 65 30.3 60.6 ? ma 1 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation ? v out2 i out = 10 a to v out(s) / 50 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 to + 85 c ? 50 ? ppm / c2 oscillation frequency f osc v out = v out(s) 0.95 85 100 115 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 75 83 90 % 1 pwm / pfm switching duty ratio (for s-8356/58 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 v sh measured oscillation at ext pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 off / on pin input voltage (with shutdown function) v sl2 judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 1
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 13 table 23 (2 / 2) (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit i sh off / on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 off / on pin input current (for with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 3.0 6.0 12.0 ms 2 efficiency effi ? ? 85 ? % 2 external parts coil: cdrh6d28-470 of sumida corporation diode: rb461f (schottky type) of rohm co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation transistor: cph3210 of sanyo electric co., ltd. base resistor (r b ): 1.0 k ? base capacitor (c b ): 2200 pf (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 50 ? with shutdown function : off / on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 14 (2) 250 khz product (h, j and l types) table 24 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx15 to 19 ? 28.9 48.2 a 1 s-835xx20 to 29 ? 42.7 71.1 a 1 s-835xx30 to 39 ? 58.0 96.7 a 1 s-835xx40 to 49 ? 74.5 124.1 a 1 s-835xx50 to 59 ? 92.0 153.4 a 1 s-835xx60 to 65 ? 110.5 184.2 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx15 to 19 ? 8.7 17.3 a 1 s-835xx20 to 29 ? 8.8 17.6 a 1 s-835xx30 to 39 ? 9.0 18.0 a 1 s-835xx40 to 49 ? 9.2 18.3 a 1 s-835xx50 to 59 ? 9.3 18.6 a 1 s-835xx60 to 65 ? 9.5 19.0 a 1 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 1 ext pin output current i exth v ext = v out ? 0.4 v s-835xx15 to 19 ? 4.5 ? 8.9 ? ma 1 s-835xx20 to 24 ? 6.2 ? 12.3 ? ma 1 s-835xx25 to 29 ? 7.8 ? 15.7 ? ma 1 s-835xx30 to 39 ? 10.3 ? 20.7 ? ma 1 s-835xx40 to 49 ? 13.3 ? 26.7 ? ma 1 s-835xx50 to 59 ? 16.1 ? 32.3 ? ma 1 s-835xx60 to 65 ? 18.9 ? 37.7 ? ma 1 i extl v ext = 0.4 v s-835xx15 to 19 9.5 19.0 ? ma 1 s-835xx20 to 24 12.6 25.2 ? ma 1 s-835xx25 to 29 15.5 31.0 ? ma 1 s-835xx30 to 39 19.2 38.5 ? ma 1 s-835xx40 to 49 23.8 47.6 ? ma 1 s-835xx50 to 59 27.4 54.8 ? ma 1 s-835xx60 to 65 30.3 60.6 ? ma 1 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation ? v out2 i out = 10 a to v out(s) / 50 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 to + 85 c ? 50 ? ppm / c2 oscillation frequency f osc v out = v out(s) 0.95 212.5 250 287.5 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 70 78 85 % 1 pwm / pfm switching duty ratio (for s-8356/58 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 v sh measured oscillation at ext pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 off / on pin input voltage (with shutdown function) v sl2 judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 1 i sh off / on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 off / on pin input current (with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 1.5 3.0 6.0 ms 2 efficiency effi ? ? 85 ? % 2
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 15 external parts coil: cdrh6d28-220 of sumida corporation diode: rb461f (schottky type) of rohm co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation transistor: cph3210 of sanyo electric co., ltd. base resistor (r b ): 1.0 k ? base capacitor (c b ): 2200 pf (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 50 ? with shutdown function : off / on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 16 (3) 300 khz product (f, g and m types) table 25 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx15 to 19 ? 33.8 56.4 a 1 s-835xx20 to 29 ? 50.3 83.9 a 1 s-835xx30 to 39 ? 68.6 114.4 a 1 s-835xx40 to 49 ? 88.4 147.4 a 1 s-835xx50 to 59 ? 109.4 182.4 a 1 s-835xx60 to 65 ? 131.6 219.3 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx15 to 19 ? 9.7 19.4 a 1 s-835xx20 to 29 ? 9.9 19.7 a 1 s-835xx30 to 39 ? 10.0 20.0 a 1 s-835xx40 to 49 ? 10.2 20.4 a 1 s-835xx50 to 59 ? 10.4 20.7 a 1 s-835xx60 to 65 ? 10.5 21.0 a 1 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 1 ext pin output current i exth v ext = v out ? 0.4 v s-835xx15 to 19 ? 4.5 ? 8.9 ? ma 1 s-835xx20 to 24 ? 6.2 ? 12.3 ? ma 1 s-835xx25 to 29 ? 7.8 ? 15.7 ? ma 1 s-835xx30 to 39 ? 10.3 ? 20.7 ? ma 1 s-835xx40 to 49 ? 13.3 ? 26.7 ? ma 1 s-835xx50 to 59 ? 16.1 ? 32.3 ? ma 1 s-835xx60 to 65 ? 18.9 ? 37.7 ? ma 1 i extl v ext = 0.4 v s-835xx15 to 19 9.5 19.0 ? ma 1 s-835xx20 to 24 12.6 25.2 ? ma 1 s-835xx25 to 29 15.5 31.0 ? ma 1 s-835xx30 to 39 19.2 38.5 ? ma 1 s-835xx40 to 49 23.8 47.6 ? ma 1 s-835xx50 to 59 27.4 54.8 ? ma 1 s-835xx60 to 65 30.3 60.6 ? ma 1 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation ? v out2 i out = 10 a to v out(s) / 50 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 to + 85 c ? 50 ? ppm / c2 oscillation frequency f osc v out = v out(s) 0.95 255 300 345 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 70 78 85 % 1 pwm / pfm switching duty ratio (for s-8356/58 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 v sh measured oscillation at ext pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 off / on pin input voltage (with shutdown function) v sl2 judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 1 i sh off / on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 off / on pin input current (with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 1.5 3.0 6.0 ms 2 efficiency effi ? ? 85 ? % 2
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 17 external parts coil: cdrh6d28-220 of sumida corporation diode: rb461f (schottky type) of rohm co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation transistor: cph3210 of sanyo electric co., ltd. base resistor (r b ): 1.0 k ? base capacitor (c b ): 2200 pf (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 50 ? with shutdown function : off / on pin is connected to v out for v dd / v out separate type : vdd pin is connected to vout pin remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 18 (4) 600 khz product (n type) table 26 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 2 input voltage v in ? ? ? 10 v 2 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 2 oscillation start voltage v st2 no external parts, voltage applied to v out ? ? 0.8 v 1 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 2 current consumption 1 i ss1 v out = v out(s) 0.95 s-835xx15 to 19 ? 63.6 105.9 a 1 s-835xx20 to 29 ? 96.4 160.6 a 1 s-835xx30 to 39 ? 132.8 221.3 a 1 s-835xx40 to 49 ? 172.2 286.9 a 1 s-835xx50 to 59 ? 214.0 356.7 a 1 s-835xx60 to 65 ? 240.2 400.3 a 1 current consumption 2 i ss2 v out = v out(s) + 0.5 v s-835xx15 to 19 ? 15.9 31.8 a 1 s-835xx20 to 29 ? 16.1 32.1 a 1 s-835xx30 to 39 ? 16.2 32.4 a 1 s-835xx40 to 49 ? 16.4 32.8 a 1 s-835xx50 to 59 ? 16.6 33.1 a 1 s-835xx60 to 65 ? 16.7 33.3 a 1 current consumption during shutdown i sss off / on v = 0 v ? ? 0.5 a 1 ext pin output current i exth v ext = v out ? 0.4 v s-835xx15 to 19 ? 4.5 ? 8.9 ? ma 1 s-835xx20 to 24 ? 6.2 ? 12.3 ? ma 1 s-835xx25 to 29 ? 7.8 ? 15.7 ? ma 1 s-835xx30 to 39 ? 10.3 ? 20.7 ? ma 1 s-835xx40 to 49 ? 13.3 ? 26.7 ? ma 1 s-835xx50 to 59 ? 16.1 ? 32.3 ? ma 1 s-835xx60 to 65 ? 18.9 ? 37.7 ? ma 1 i extl v ext = 0.4 v s-835xx15 to 19 9.5 19.0 ? ma 1 s-835xx20 to 24 12.6 25.2 ? ma 1 s-835xx25 to 29 15.5 31.0 ? ma 1 s-835xx30 to 39 19.2 38.5 ? ma 1 s-835xx40 to 49 23.8 47.6 ? ma 1 s-835xx50 to 59 27.4 54.8 ? ma 1 s-835xx60 to 65 30.3 60.6 ? ma 1 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 2 load regulation ? v out2 i out = 10 a to v out(s) / 50 1.25 ? 30 60 mv 2 output voltage temperature coefficient out out v ta ? v ? ? ta = ? 40 to + 85 c ? 50 ? ppm / c2 oscillation frequency f osc v out = v out(s) 0.95 510 600 690 khz 1 maximum duty ratio maxduty v out = v out(s) 0.95 65 78 85 % 1 pwm / pfm switching duty ratio (for s-8356/58 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 1 off / on pin input voltage v sh measured oscillation at ext pin 0.75 ? ? v 1 v sl1 at v out 1.5 v ? ? 0.3 v 1 v sl2 judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 1 off / on pin input current i sh off / on v = v out(s) 0.95 ? 0.1 ? 0.1 a 1 i sl off / on v = 0 v ? 0.1 ? 0.1 a 1 soft start time t ss ? 1.5 3.0 6.0 ms 2 efficiency effi ? ? 85 ? % 2
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 19 external parts coil: cdrh6d28-100 of sumida corporation diode: rb461f (schottky type) of rohm co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation transistor: cph3210 of sanyo electric co., ltd. base resistor (r b ): 1.0 k ? base capacitor (c b ): 2200 pf (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 50 ? , off / on = v out remark v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 20 (5) 600 khz product (p and q types) table 27 (ta = 25 c unless otherwise specified) item symbol condition min. typ. max. unit measurement circuit output voltage v out ? v out(s) 0.976 v out(s) v out(s) 1.024 v 4 input voltage v in ? ? ? 10 v 4 operation start voltage v st1 i out = 1 ma ? ? 0.9 v 4 oscillation start voltage v st2 no external parts, voltage applied to v dd ? ? 0.8 v 3 operation holding voltage v hld i out = 1 ma, judged by decreasing v in voltage gradually 0.7 ? ? v 4 current consumption 1 i ss1 v dd = 3.3 v ? 132.8 221.3 a 3 current consumption 2 i ss2 v dd = 3.3 v ? 16.2 32.4 a 3 current consumption during shutdown (with shutdown function) i sss off / on v = 0 v ? ? 0.5 a 3 ext pin output current i exth v dd = 3.3 v ? 10.3 ? 20.7 ? ma 3 i extl v dd = 3.3 v 19.2 38.5 ? ma 3 line regulation ? v out1 v in = v out(s) 0.4 to 0.6 ? 30 60 mv 4 load regulation ? v out2 i out = 10 a to v out(s) / 50 1.25 ? 30 60 mv 4 output voltage temperature coefficient out out v ta v ? ? ? ta = ? 40 to + 85 c ? 50 ? ppm / c4 oscillation frequency f osc v dd = 3.3 v 510 600 690 khz 3 maximum duty ratio maxduty v dd = 3.3 v 65 78 85 % 3 pwm / pfm switching duty ratio (for s-8356/58 series) pfmduty v in = v out(s) ? 0.1 v, no-load 10 15 24 % 3 v sh measured oscillation at ext pin 0.75 ? ? v 3 v sl1 at v out 1.5 v ? ? 0.3 v 3 off / on pin input voltage (with shutdown function) v sl2 judged oscillation stop at ext pin at v out < 1.5 v ? ? 0.2 v 3 i sh off / on v = v out(s) 0.95 ? 0.1 ? 0.1 a 3 off / on pin input current (with shutdown function) i sl off / on v = 0 v ? 0.1 ? 0.1 a 3 soft start time t ss ? 1.5 3.0 6.0 ms 4 efficiency effi ? ? 85 ? % 4 external parts coil: cdrh6d28-100 of sumida corporation diode: rb461f (schottky type) of rohm co., ltd. capacitor: f93 (16 v, 47 f tantalum type) of nichicon corporation transistor: cph3210 of sanyo electric co., ltd. base resistor (r b ): 1.0 k ? base capacitor (c b ): 2200 pf (ceramic type) v in = v out(s) 0.6 applied, i out = v out(s) / 50 ? , off / on = v out remark 1. v out(s) specified above is the set output voltage value, and v out is the typical value of the actual output voltage. 2. v dd / v out separate type a step-up operation is performed from v dd = 0.8 v. however, 1.8 v v dd 10 v is recommended stabilizing the output voltage and oscillation frequency. (v dd 1.8 v must be applied for products with a set value of less than 1.9 v.)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 21 ? measurement circuits 1. oscilloscope a + ? vss ext vout vdd *2 0.1 f off / on *1 figure 10 2. v c d r b vss ext vout vdd *2 0.1 f off / on *1 + ? + ? figure 11 3. oscilloscope vss ext vout vdd 0.1 f a off / on *1 + ? figure 12 4. v c d r b vss ext vout vdd 0.1 f off / on *1 + ? + ? figure 13 *1. with shutdown function *2. for v dd / v out separate type
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 22 ? operation 1. switching control types 1.1 pwm control (s-8355/57 series) the s-8355/57 series is a dc-dc converter using a pu lse width modulation method (pwm) and features a low current consumption. in conventional pfm dc-dc converters, pulses are skip ped when the output load current is low, causing a fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage. the switching frequency does not change, although the pulse width changes from 0 to 83% (78% for f, g, h, j, l, m, n, p and q types) corresponding to each load current. the ripple voltage generated from switching can thus be removed easily through a filter because the switching frequency is constant. 1.2 pwm/pfm switching control (s-8356/58 series) s-8356/58 series is a dc-dc converter that automatical ly switches between a pulse width modulation method (pwm) and a pulse frequency modulation method (pfm), depending on the load current, and features low current consumption. the s-8356/58 series operates under pwm control with the pulse width duty changing from 15 to 83% (78% for f, g, h, j, l, m, n, p and q types) in a high output load current area. the s-8356/58 series operates under pfm control with the pulse width duty fixed at 15%, and pulses are skipped according to the load cu rrent. the oscillation circuit thus oscillates in termittently so that t he resultant lower self current consumption prevents a reduction in the efficiency at a low load current. the switching point from pwm control to pfm control depends on the external devices (coil, diode, etc.), input voltage and output voltage. this series are an especially highly efficient dc- dc converter at an output current around 100 a. 2. soft start function for this ic, the built-in soft start circuit controls the rush current and overshoot of the output voltage when powering on or when the off / on pin is switched to the ?h? level.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 23 3. off on/ pin (shutdown pin) (sot-23-5 package products of s-8355/56/57/58 series b, h, f, k, l, m, n and q types, and 6-pin snb(b) package products) off / on pin stops or starts step-up operation. setting the off / on pin to the ?l? level stops operation of all the internal circuits and reduces the current consumption significantly. do not use the off / on pin in a floating state because it has the structure shown in figure 14 and is not pulled up or pulled down internally. do not apply a voltage of between 0.3 v and 0.75 v to the off / on pin because applying such a voltage increases the current consumption. if the off / on pin is not used, connect it to the vout pin. the off / on pin does not have hysteresis. table 28 off / on pin cr oscillation circuit output voltage ?h? operation fixed ?l? stop ? v in *1 *1. voltage obtained by subtracting the voltage drop due to the dc resistance of the inductor and the diode forward voltage from v in . vss vout *1 off / on *1. vdd for k, l, m and q types. figure 14 off on/ pin structure
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 24 4. operation the following are the basic equations [(1) through (7)] of the step-up switching regulator. (refer to figure 15 .) c l m1 d vout cont vin l + ext vss ? figure 15 step-up switching regulator circuit for basic equation voltage at cont pin at the moment m1 is turned on (v a ) *1 : v a = v s *2 (1) *1. current flowing through l (i l ) is zero. *2. non-saturated voltage of m1. the change in i l over time : l v v l v dt di s in l l ? = = (2) integration of equation (2) (i l ) : t l v v i s in l ? ? ? ? ? ? ? ? = (3) i l flows while m1 is on (t on ). the time of t on is determined by the oscillation frequency of osc. the peak current (i pk ) after t on : on s in pk t l v v i ? ? ? ? ? ? ? ? = (4) the energy stored in l is represented by 1/2 ? l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is emitted through a diode to the output capacitor. then, the reverse voltage (v l ) is generated : v l = (v out + v d *1 ) ? v in (5) *1. diode forward voltage the voltage at cont pin rises only by v out + v d . the change in the current (i l ) flowing through the diode into v out during t off : l v v v l v dt di in d out l l ? + = = (6)
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 25 integration of the equation (6) is as follows : t l v v v i i in d out pk l ? ? ? ? ? ? ? ? + ? = (7) during t on , the energy is stored in l and is not transmitted to v out . when receiving the output current (i out ) from v out , the energy of the capacitor (c l ) is consumed. as a result, the pin voltage of c l is reduced, and goes to the lowest level after m1 is turned on (t on ). when m1 is turned off, the energy stored in l is transmitted th rough the diode to c l , and the voltage of c l rises rapidly. v out is a time function, and therefore indicates the maximum value (ripple voltage (v p ? p ) ) when the current flowing through into v out and load current (i out ) match. next, the ripple voltage is determined as follows. i out vs. t 1 (time) from when m1 is turned off (after t on ) to when v out reaches the maximum level : 1 in d out pk out t l v v v i i ? ? ? ? ? ? ? ? + ? = (8) ? ? ? ? ? ? ? ? ? + ? ? = in d out out pk 1 v v v l ) i i ( t (9) when m1 is turned off (t off ), i l = 0 (when the energy of the inductor is completely transmitted). based on equation (7) : pk off in d out i t v v v l = ? ? ? ? ? ? ? ? ? + (10) when substituting equation (10) for equation (9) : off pk out off 1 t i i t t ? ? ? ? ? ? ? ? ? ? = (11) electric charge ? q 1 which is charged in c l during t 1 : 2 1 in d out 1 pk 1 t 0 in d out 1 t 0 pk l 1 t 0 1 t 2 1 l v v v t i tdt l v v v dt i dt i q ? ? + ? ? = ? ? + ? ? = = ? (12) when substituting equation (12) for equation (9) : () 1 out pk 1 out pk pk t 2 i i t i i 2 1 i 1 q ? + = ? ? ? = ? (13) a rise in voltage (v p ? p ) due to ? q 1 : 1 out pk l l 1 p p t 2 i i c 1 c q ? v ? ? ? ? ? ? ? + ? = = ? (14) when taking into consideration i out to be consumed during t 1 and the equivalent series resistance (r esr ) of c l : l 1 out esr out pk out pk l l 1 p p c t i r 2 i i 1 t 2 i i c 1 c q v ? ? ? ? ? ? ? ? ? + + ? ? ? ? ? ? ? + ? = ? = ? (15) when substituting equation (11) for equation (15) : esr out pk l off pk 2 out pk p p r 2 i i c t i 2 ) i i ( v ? ? ? ? ? ? ? + + ? ? = ? (16) therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small r esr .
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 26 ? external parts selection the relationship between the major characteristics of the step-up circuit and the characteristics parameters of the external parts are shown in figure 16 . for higher efficiency ? for larger output current ? operation efficiency stand-by efficiency for smaller ripple voltage ? smaller inductance larger inductance smaller direct current re sistance of inductor larger output capacitance larger output capacitance with mos fet, smaller on resistance with mos fet, smaller input capacitance with bipolar transistor, smaller external resistance r b with bipolar tran sistor, larger external resistance r b figure 16 relationship between major characteristics of step-up circuit and external parts
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 27 1. inductor the inductance value (l value) has a strong influence on the maximum output current (i out ) and efficiency ( ). figure 17 shows the relationship between the i out and dependency on l of s-8355/56/57/58. f, g, h, j, l and m types cdrh6d28, v out = 5.0 v, v in = 3.0 v recommended range i out 4.7 47 l value ( h) efficiency decreases i out decreases i pk increases coil size : smaller efficiency decreases i out decreases i pk decreases coil size : bigger figure 17 l value vs. i out characteristics, l value vs. characteristics the peak current (i pk ) increases by decreasing l value and the stability of the circuit improves and i out increases. if l value is decreased, the efficiency falls causing a decline in the current drive capacity for the switching transistor, and i out decreases. the loss of i pk by the switching transistor decreases by increasing l value and the efficiency becomes maximum at a certain l value. further increasing l value decreases the effi ciency due to the loss of the di rect current resistance of the coil. i out also decreases. a higher oscillation frequency allows selection of a lower l value, making the coil smaller. the recommended inductances are a 22 to 100 h for b, e, and k types, a 4.7 to 47 h for f, g, h, j, l, and m types, 3.0 to 22 h for n, p and q types. be careful of the allowable inductor current when choosing an inductor. exceeding the allowable current of the inductor causes magnetic saturation, much lower efficiency and destruction of the ic chip due to a large current. choose an inductor so that i pk does not exceed the allowable current. i pk in discontinuous mode is calculated by the following equation: l f ) v v v ( i 2 i osc in d out out pk ? ? + = (a) (17) f osc = oscillation frequency, v d ? 0.4 v. 2. diode use an external diode that meets the following requirements : ? low forward voltage : v f < 0.3 v ? high switching speed : 500 ns max. ? reverse voltage : v out + v f or more ? current rate : i pk or more
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 28 3. capacitor (c in , c l ) a capacitor on the input side (c in ) improves the efficiency by reducing the power impedance and stabilizing the input current. select a c in value according to the impedance of the power supply used. a capacitor on the output side (c l ) is used for smoothing the output voltage. for step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. therefore, select an appropriate capacitor in accordance with the ripple voltage, which increases in case of a higher output voltage or a higher load current. the capacitor value should be 10 f or more. select an appropriate capacitor the equivalent series resistance (r esr ) for stable output voltage. the stable voltage range in this ic depends on the r esr . although the inductance value (l value) is also a factor, an r esr of 30 to 500 m ? maximizes the characteristics. however, the best r esr value may depend on the l value, the capacitance, the wiring, and the applications (output load). therefore, fully evaluate the r esr under the actual operating conditions to determine the best value. refer to the ? 3. example of ceramic capacitor application ? ( figure 27 ) in the ? ? application circuit ? for the circuit example using a ceramic capacitor and the external resistance of the capacitor (r esr ). 4. external transistor an enhancement (n-channel) mos fet type or a bipolar (npn) type can be used as the external transistor. 4.1 enhancement (n-channel) mos fet type figure 18 is a circuit example using a mos fet transistor (n-channel). v out ext vout + ? off / on *2 vss vdd *1 + ? *1. for v dd / v out separate type. *2. with shutdown function. figure 18 circuit example using mos fet (n-channel) type an n-channel power mos fet should be used for the mos fet. because the gate voltage and current of the external power mos fet are supplied from the stepped-up output voltage (v out ), the mos fet is driven more effectively. a large current may flow during startup, depending on the mos fet selection. so perform sufficient evaluation using the actual devices. also recommend to use a mos fet with an input capacitance of 700 pf or less. since the on-resistance of the mos fet might depend on the difference between the output voltage (v out ) and the threshold voltage of the mos fet, and affect the output current as well as the efficiency, the threshold voltage should be low. when the output voltage is low, the circuit operates only when the mos fet has a threshold voltage lower than the output voltage.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 29 4.2 bipolar (npn) type a circuit example using the cph3210 (h fe = 200 to 560) from sanyo electric co., ltd. as a bipolar transistor (npn) is shown in figure 20 to 25 in the ? ? standard circuits ?. the h fe value and r b value of the bipolar transistor determine the driving capacity to increase the ou tput current using a bipolar transistor. a peripheral circuit example of the transistor is shown in figure 19 . nch pch vout *1 i pk ext c b 2200 pf r b 1 k ? *1. v dd for e, g, j, k, l, m, p and q types. figure 19 external transistor peripheral circuit the recommended r b value is around 1 k ? . actually, calculate the necessary base current (i b ) from the bipolar transistor (h fe ) using fe pk b h i i = , and select the smaller r b value than exth b out b i 4 . 0 i 7 . 0 v r ? ? = *1 . a small r b value can increase the output current, but the efficiency decreases. since a current may flow on the pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the optimum r b value should be determined by experiment. connecting the speed-up capacitor (c b ) in parallel with the r b resistance as shown in figure 19 , decreases switching loss and improves the efficiency. the c b value is calculated according to 7 . 0 f r 2 1 c osc b b ? ? ? . select a c b value after performing sufficient evaluation since the optimum c b value differs depending upon the characteristics of the bipolar transistor. *1. for e, g, j, k, l, m, p and q type, exth b dd b i 4 . 0 i 7 . 0 v r ? ? = .
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 30 5. v dd / v out separate type (for e, g, j, k, l, m, p and q types) the e, g, j, k, l, m, p and q types provides separate internal circuit power supply (vdd pin) and output voltage setting pin (vout pin) in the ic, making it ideal for the following applications. (1) when changing the output voltage with external resistance. (2) when outputting a high voltage such as + 15 v or + 20 v. choose the products in the table 29 according to the applications (1) or (2) above. table 29 output voltage (v cc ) 1.8 v v cc < 5 v 5 v v cc reference circuit s-835xx18 yes yes application circuit 1 (figure 26) s-835xx50 ? yes application circuit 1 (figure 26) connection to vdd pin v in or v cc v in ? cautions 1. this ic starts a step-up operation at v dd = 0.8 v, but set 1.8 v dd 10 v to stabilize the output voltage and frequency of the oscillator. (input a voltage of 1.8 v or more at the vdd pin for all products with a setting less than 1.9 v.) an input voltage of 1.8 v or more at the vdd pin allows connection of the vdd pin to either the input voltage vin pin or output vout pin. 2. choose external resistors r a and r b so as to not affect the output voltage, considering that there is impedance between the vout pin and vss pin in the ic chip. the inte rnal resistance between the vout pin and vss pin is as follows : (1) s-835xx18 : 2.1 to 14.8 m ? (2) s-835xx20 : 1.4 to 14.8 m ? (3) s-835xx30 : 1.4 to 14.2 m ? (4) s-835xx50 : 1.4 to 12.1 m ? 3. attach a capacitor (c c ) in parallel to the r a resistance when an unstable event such as oscillation of the output voltage occurs. calculate c c using the following equation : [] khz 20 r 2 1 c a c ? ? ? = f
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 31 ? standard circuits 1 s-8357bxxma, s-8357bxxua, s-8358bxxma, s-8358bxxua vout ext vss pwm control circuit or pwm / pfm switching control circuit phase compensating circuit oscillation circuit soft start built-in reference power supply + ? v in 1 k ? 2200 p f c in sd c l + ? + ? ic internal power supply remark the power supply for the ic chip is from the vout pin. figure 20 2 s-8357bxxmc, s-8357fxxmc / bd, s-8357hxxmc / bd, s-8357nxxmc / bd, s-8358bxxmc, s-8358fxxmc / bd, s-8358hxxmc / bd, s-8358nxxmc / bd vout v in l 2200 p f c in sd c l + ? + ? vss + ? off / on ext oscillation circuit pwm control circuit or pwm / pfm switching control circuit soft start built-in reference power supply ic internal power supply phase compensating circuit 1 k ? remark the power supply for the ic chip is from the vout pin. figure 21 3 s-8357exxmc, s-8357gxxmc / bd, s-8357jxxmc / bd, s-83 57pxxmc / bd, s-8358exxmc, s-8358gxxmc / bd, s-8358jxxmc / bd, s-8358pxxmc / bd vout ext vss v in l 2200 p f c in sd + ? oscillation circuit pwm control circuit or pwm / pfm switching control circuit soft start built-in reference power supply vdd + ? phase compensating circui t c c c l + ? r a r b ic internal power supply 1 k ? remark the power supply for the ic chip is from the vout pin. figure 22
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 32 4 s-8357exxmc, s-8357gxxmc / bd, s-8357jxxmc / bd, s-8358exxmc, s-8358gxxmc / bd, s-8358jxxmc / bd vout ext vss v in l 2200 p f c in sd c l + ? + ? oscillation circuit pwm control circuit or pwm / pfm switching control circuit soft start built-in reference power supply vdd + ? phase compensating circuit ic internal power supply 1 k ? remark the power supply for the ic chip is from the vout pin. figure 23 5 s-8355kxxmc / bd, s-8355lxxmc / bd, s-8355mxxmc / bd, s-8355qxxmc / bd, s-8356kxxmc / bd, s-8356lxxmc / bd, s-8356mxxmc / bd, s-8356qxxmc / bd vout ext vss v in l 2200 p f c in sd + ? c l + ? vdd c c r a r b off / on oscillation circuit pwm control circuit or pwm / pfm switching control circuit + ? soft start built-in reference power supply phase compensating circuit ic internal power supply 1 k ? remark the power supply for the ic chip is from the vout pin. figure 24 6 s-8355kxxmc / bd, s-8355lxxmc / bd, s-8355mxxmc / bd, s-8356kxxmc / bd, s-8356lxxmc / bd, s-8356mxxmc / bd vout v in l 2200 p f c in sd c l + ? + ? vss ext vdd off / on oscillation circuit pwm control circuit or pwm / pfm switching control circuit + ? soft start built-in reference power supply phase compensating circuit ic internal power supply 1 k ? remark the power supply for the ic chip is from the vout pin. figure 25 caution the above connection diagram and constant will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 33 ? precautions ? mount external capacitors, the diode, and the coil as close as possible to the ic. ? characteristics ripple voltage and spike noise occur in ic containing switching regulators. moreover rush current flows at the time of a power supply injection. because these largely depend on the coil, the capacitor and impedance of power supply used, fully check them using an actually mounted model. ? make sure that the dissipation of the switching transistor (especially at a high temperature) does not exceed the allowable power dissipation of the package. ? the performance of this ic varies depending on the design of the pcb patterns, peripheral circuits and external parts. thoroughly test all settings with your device. also, try to use the recommended external parts. if not, contact an sii sales person. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any disputes arising out of or in connection with any infringement by products including this ic of patents owned by a third party.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 34 ? application circuits 1. lcd power supply the following example is an application power supply circuit (15 v / 20 v output) to drive an lcd panel, and its characteristics. s-8356m50, s-8356q50 ext vout vss vdd v out c l c c r b r a tr c in v in ? + ? + off / on l sd figure 26 power supply circuit example for lcd table 30 condition output voltage ic l type name tr type name sd type name c l r a r b cc 1 15 v s-8356m50 cdrh5d18-220 mch3405 ma2z748 f93 (20 v, 10 f) 580 k ? 300 k ? 15 pf 2 20 v s-8356m50 cdrh5d18-220 fdn337n ma729 f93 (25 v, 10 f) 575 k ? 200 k ? 15 pf 3 10 v s-8356q50 cdrh5d18-100 mch3405 ma2z748 f93 (20 v, 10 f) 560 k ? 560 k ? 15 pf caution the above connection diagram and constant will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 35 2. output characteristics of the power supply for lcd the data of the step-up characteristics (a) output current (i out ) vs. efficiency ( ) characteristics, (b) output current (i out ) vs. output voltage (v out ) characteristics under conditions of 1 to 3 in table 30 is shown below. condition 1 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 0.01 0.1 1 10 100 [%] i out [ma] v in = 3.0 v v in = 5.0 v v in = 7.0 v 12 13 14 15 16 v out [v] 0.01 0.1 1 10 100 i out [ma] v in = 3.0 v v in = 5.0 v v in = 7.0 v condition 2 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 [%] 0.01 0.1 1 10 100 i out [ma] v in = 3.0 v v in = 5.0 v v in = 7.0 v 14 16 18 20 22 v out [v] 0.01 0.1 1 10 100 i out [ma] v in = 3.0 v v in = 5.0 v v in = 7.0 v condition 3 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 [%] 0.01 0.1 1 10 100 i out [ma] v in = 3.3 v v in = 5.0 v 7 8 9 10 11 v out [v] 0.01 0.1 1 10 100 i out [ma] v in = 3.3 v v in = 5.0 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 36 3. using ceramic capacitor example when using small r esr parts such as ceramic capacitors for the output capacitance, mount a resistor (r 1 ) corresponding to the r esr in series with the ceramic capacitor (c l ) as shown in figure 27 . r 1 differs depending on ?l? value, the capacitance, the wiring, and the application (output load). the following example shows a circuit using r 1 = 100 m ? , output voltage = 3.3 v, output load = 500 ma and its characteristics. ext vout vss v out sd c l l r 1 tr v in c in figure 27 using ceramic capacitor circuit example table 31 condition ic l type name tr type name sd type name sd type name r 1 1 s-8357f33 cdrh6d28-220 fdn335n m1fh3 10 f 2 100 m ? 2 s-8358b50 cdrh6d28-470 fdn335n m1fh3 10 f 2 100 m ? 3 s-8357n33 cdrh6d28-100 fdn335n m1fh3 10 f 2 100 m ? caution the above connection diagram and constant will not guarantee successful operation. perform through evaluation using the actual application to set the constant.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 37 4. output characteristics of the using ceramic capacitor circuit example the data of the step-up characteristics (a) output current (i out ) vs. efficiency ( ) characteristics, (b) output current (i out ) vs. output voltage (v out ) characteristics, (c) output current (i out ) vs. ripple voltage (vr) under conditions of 1 to 3 in table 31 is shown below. condition 1 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 [%] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.28 3.29 3.30 3.31 3.32 v out [v] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v (c) output current (i out ) vs. ripple voltage (v r ) 0 20 40 60 80 100 vr [mv] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 2 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 [%] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 2.0 v v in = 3.0 v v in = 4.0 v 5.03 5.04 5.05 5.06 5.07 v out [v] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 2.0 v v in = 3.0 v v in = 4.0 v (c) output current (i out ) vs. ripple voltage (v r ) 0 20 40 60 80 100 v r [mv] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 2.0 v v in = 3.0 v v in = 4.0 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 38 condition 3 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 0 20 40 60 80 100 [%] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.28 3.29 3.30 3.31 3.32 v out [v] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v (c) output current (i out ) vs. ripple voltage (v r ) 0 20 40 60 80 100 vr [mv] 0.01 0.1 1 10 100 i out [ma] 1000 v in = 0.9 v v in = 1.8 v v in = 2.7 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 39 ? characteristics (typical data) 1. example of major temperature characteristics (ta = ? 40 to + 85 c) (1) current consumption 1 (i ss1 ) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 0 10 20 30 40 50 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss1 [ a] 0 10 20 30 40 50 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss1 [ a] f osc = 600 khz 0 20 40 60 80 100 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss1 [ a] (2) current consumption 2 (i ss2 ) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 0 2 4 6 8 10 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss2 [ a] 0 2 4 6 8 10 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss2 [ a] f osc = 600 khz 0 2 4 6 8 10 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i ss2 [ a]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 40 (3) current consumption at shutdown (i sss ) vs. temperature (ta) f osc = 100 khz f osc = 300 khz 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i sss [ a] 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i sss [ a] (4) ext pin output current ?h? (i exth ) vs. temperature (ta) (5) ext pin output current ?l? (i extl ) vs. temperature (ta) v out = 3.3 v, f osc = 100 khz v out = 3.3 v, f osc = 300 khz ? 10 ? 20 ? 30 ? 40 ? 50 ? 60 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i exth [ma] 0 0 10 20 30 40 50 60 ? 40 ? 20 0 20 40 60 80 100 ta [ c] i extl [ma] (6) oscillation frequency (f osc ) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 50 75 100 125 150 ? 40 ? 20 0 20 40 60 80 100 ta [ c] f osc [khz] 200 250 300 350 400 ? 40 ? 20 0 20 40 60 80 100 ta [ c] f osc [khz] f osc = 600 khz 400 500 600 700 800 ? 40 ? 20 0 20 40 60 80 100 ta [ c] f osc [khz]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 41 (7) maximum duty ratio (maxduty) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 70 75 80 85 90 ? 40 ? 20 0 20 40 60 80 100 ta [ c] maxduty [%] 70 75 80 85 90 ? 40 ? 20 0 20 40 60 80 100 ta [ c] maxduty [%] f osc = 600 khz 70 75 80 85 90 ? 40 ? 20 0 20 40 60 80 100 ta [ c] maxduty [%] (8) pwm / pfm switching duty ratio (pfmduty) vs. temperature (ta) (s-8356/58 series) (9) off / on pin input voltage ?h? (v sh ) vs. temperature (ta) v out = 3.3 v, f osc = 100 khz v out = 3.3 v, f osc = 300 khz 5 10 15 20 25 ? 40 ? 20 0 20 40 60 80 100 ta [ c] pfmduty [%] 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v sh [v] (10) off / on pin input voltage ?l? 1 (v sl1 ) vs. temperature (ta) (11) off / on pin input voltage ?l? 2 (v sl2 ) vs. temperatuer (ta) v out = 3.3 v, f osc = 300 khz v out = 1.4 v, f osc = 300 khz 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v sl1 [v] 0 0.2 0.4 0.6 0.8 1.0 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v sl2 [v]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 42 (12) soft start time (t ss ) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 0 2 4 6 8 ? 40 ? 20 0 20 40 60 80 100 ta [ c] t ss [ms] 0 2 4 6 8 ? 40 ? 20 0 20 40 60 80 100 ta [ c] t ss [ms] f osc = 600 khz 0 2 4 6 8 ? 40 ? 20 0 20 40 60 80 100 ta [ c] t ss [ms] (13) operation start voltage (v st1 ) vs. temperature (ta) (14) oscillation start voltage (v st2 ) vs. temperature (ta) v out = 3.3 v, f osc = 100 khz v out = 3.3 v, f osc = 100 khz 0 0.2 0.4 0.6 0.8 1.0 1.2 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v st1 [v] 0 0.2 0.4 0.6 0.8 1.0 1.2 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v st2 [v]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 43 (15) output voltage (v out ) vs. temperature (ta) (v out = 3.3 v) f osc = 100 khz f osc = 300 khz 3.20 3.25 3.30 3.35 3.40 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v out [v] 3.20 3.25 3.30 3.35 3.40 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v out [v] f osc = 600 khz 3.20 3.25 3.30 3.35 3.40 ? 40 ? 20 0 20 40 60 80 100 ta [ c] v out [v]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 44 2. examples of major power supply dependence characteristics (ta = 25 c) (1) current consumption 1 (i ss1 ) vs. power supply voltage (v dd ), current consumption 2 (i ss2 ) vs. power supply voltage (v dd ) (v out = 3.3 v) f osc = 300 khz f osc = 600 khz 0 10 20 30 40 50 0 2 4 6 8 10 v dd [v] i ss1,2 [ a] 0 20 40 60 80 100 0 2 4 6 8 10 v dd [v] i ss1,2 [ a] (2) current consumption at shutdown (i sss ) vs. power supply voltage (v dd ) v out = 3.3 v, f osc = 300 khz 0 0.2 0.4 0.6 0.8 1.0 i sss [ a] 0 2 4 6 8 10 v dd [v] (3) oscillation friquency (f osc ) vs. power supply voltage (v dd ) f osc = 100 khz f osc = 300 khz 20 40 60 80 100 120 0 2 4 6 8 10 v dd [v] f osc [khz] 0 2 4 6 8 10 v dd [v] f osc [khz] 60 120 180 240 300 360 f osc = 600 khz 0 2 4 6 8 10 v dd [v] f osc [khz] 120 240 360 480 600 720
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 45 (4) maximum duty ratio (maxduty) vs. power supply voltage (v dd ) f osc = 100 khz f osc = 300 khz 0 2 4 6 8 10 v dd [v] 50 60 70 80 90 100 maxduty [%] 0 2 4 6 8 10 v dd [v] 50 60 70 80 90 100 maxduty [%] f osc = 600 khz 0 2 4 6 8 10 v dd [v] 50 60 70 80 90 100 maxduty [%] (5) ext pin output current ?h? (i exth ) vs. power supply voltage (v dd ) (6) ext pin output current ?l? (i extl ) vs. power supply voltage (v dd ) 0 2 4 6 8 10 v dd [v] 0 ? 20 ? 40 ? 60 ? 80 ? 100 i exth [ma] 0 2 4 6 8 10 v dd [v] 0 ? 20 ? 40 ? 60 ? 80 ? 100 i extl [ma]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 46 (7) output voltage (v out ) vs. power supply voltage (v dd ) (v dd separate type, v out = 3.3 v, v in = 1.98 v, i out = 66 ma) f osc = 100 khz f osc = 300 khz 0 2 4 6 8 10 v dd [v] 1.5 2.0 2.5 3.0 3.5 v out [v] 0 2 4 6 8 10 v dd [v] 1.5 2.0 2.5 3.0 3.5 v out [v] f osc = 600 khz 0 2 4 6 8 10 v dd [v] 1.5 2.0 2.5 3.0 3.5 v out [v]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 47 3. output waveforms (1) s-8358b33mc i out = 1 ma i out = 20 ma ? 25 ? 20 ? 15 ? 10 ? 5 0 5 10 15 20 25 time [ s] 4 2 0 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 25 ? 20 ? 15 ? 10 ? 5 0 5 10 15 20 25 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] i out = 100 ma i out = 200 ma 4 2 0 3.40 3.35 3.30 3.25 ? 25 ? 20 ? 15 ? 10 ? 5 0 5 10 15 20 25 time [ s] output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 25 ? 20 ? 15 ? 10 ? 5 0 5 10 15 20 25 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] (2) s-8358f33mc i out = 1 ma i out = 10 ma 4 2 0 3.40 3.35 3.30 3.25 ? 10 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 10 time [ s] output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 10 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 10 3.40 3.35 3.30 3.25 time [ s] output voltage [0.05 v / div] cont voltage [2.0 v / div] i out = 100 ma i out = 200 ma 4 2 0 ? 10 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 10 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 10 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 10 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 48 (3) s-8358n33mc i out = 1 ma i out = 10 ma 4 2 0 ? 5 ? 4 ? 3 ? 2 ? 1 0 1 2 3 4 5 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 5 ? 4 ? 3 ? 2 ? 1 0 1 2 3 4 5 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] i out = 100 ma i out = 200 ma 4 2 0 ? 5 ? 4 ? 3 ? 2 ? 1 0 1 2 3 4 5 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div] 4 2 0 ? 5 ? 4 ? 3 ? 2 ? 1 0 1 2 3 4 5 time [ s] 3.40 3.35 3.30 3.25 output voltage [0.05 v / div] cont voltage [2.0 v / div]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 49 4. examples of transient response characteristics (1) power-on (v in : 0 v 2 v) 100 khz, i out = 1 ma 100 khz, i out = 100 ma 0 2 ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] v in [v] 0 2 4 v out [v] v in v out 0 2 v in [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v in v out 300 khz, i out = 1 ma 300 khz, i out = 100 ma 0 2 v in [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v in v out 0 2 v in [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v in v out 600 khz, i out = 1 ma 600 khz, i out = 100 ma 0 2 v in [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v in v out 0 2 v in [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v in v out
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 50 (2) off on/ pin response ( off / on v : 0 v 2.0 v) 100 khz, i out = 1 ma 100 khz, i out = 100 ma 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v out v on/off 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v on/off v out 300 khz, i out = 1 ma 300 khz, i out = 100 ma 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v on/off v out 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v on/off v out 600 khz, i out = 1 ma 600 khz, i out = 100 ma 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v on/off v out 0 2 v on/off [v] ? 1 0 1 2 3 4 5 6 7 8 9 time [ms] 0 2 4 v out [v] v on/off v out
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 51 (3) load fluctuations 100 khz, i out : 100 a 100 ma 100 khz, i out : 100 ma 100 a ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.00 3.20 3.40 3.60 v out [0.2 v / div] 100 a i out 100 ma v out [0.2 v / div] 100 a i out 100 ma 3.20 3.40 3.60 3.80 ? 10 0 10 20 30 40 50 60 70 80 90 time [ms] 300 khz, i out : 100 a 100 ma 300 khz, i out : 100 ma 100 a v out [0.2 v / div] 100 a i out 100 ma ? 0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 time [ms] 3.00 3.20 3.40 3.60 v out [0.2 v / div] 100 a i out 100 ma 3.20 3.40 3.60 3.80 ? 10 0 10 20 30 40 50 60 70 80 90 time [ms] 600 khz, i out : 0.1 ma 100 ma 600 khz, i out : 100 ma 0.1 ma v out [0.2 v / div] 100 a i out 100 ma 3.00 3.20 3.40 3.60 ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] v out [0.2 v / div] 100 a i out 100 ma 3.00 3.20 3.60 3.80 ? 0.5 0 0.5 1.0 1.5 2.5 3.0 2.0 time [ms] 3.40
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 52 (4) input voltage fluctuations (i out = 100 ma) 100 khz, v in = 1.98 v 2.64 v 100 khz, v in = 2.64 v 1.98 v 3.25 3.30 3.35 3.40 3.45 3.0 2.5 2.0 1.5 ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] v out [v] v in [v] 3.0 2.5 2.0 1.5 v in [v] ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.25 3.30 3.35 3.40 3.45 v out [v] 300 khz, v in = 1.98 v 2.64 v 300 khz, v in = 2.64 v 1.98 v 3.0 2.5 2.0 1.5 ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.25 3.30 3.35 3.40 3.45 v in [v] v out [v] 3.0 2.5 2.0 1.5 v in [v] ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.25 3.30 3.35 3.40 3.45 v out [v] 600 khz, v in = 1.98 v 2.64 v 600 khz, v in = 2.64 v 1.98 v 3.0 2.5 2.0 1.5 v in [v] ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.25 3.30 3.35 3.40 3.45 v out [v] 3.0 2.5 2.0 1.5 v in [v] ? 0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time [ms] 3.25 3.30 3.35 3.40 3.45 v out [v]
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 53 ? reference data use this reference data to choose the external parts. this reference data makes it possible to choose the recommended external part based on the application and characteristics data. 1. external parts for reference data table 32 efficiency vs. output current characteristics and output voltage vs. output current characteristics for external condition product name oscillation frequency output voltage control system inductor transistor diode output capacitor 1 s-8357f33 300 khz 3.3 v pwm cdrh104r-220 s-90n0312sma m1fh3 f93 (16 v, 47 f) 2 2 s-8357f50 300 khz 5.0 v pwm 3 s-8356m50 300 khz 5.0 v pwm/pfm 4 s-8357b33 100 khz 3.3 v pwm cdrh104r-470 5 s-8358b33 100 khz 3.3 v pwm/pfm s-90n0442sua 6 s-8357b50 100 khz 5.0 v pwm 7 s-8356m50 300 khz 5.0 v pwm/pfm cdrh8d28-220 s-90n0212sma f93 (16 v, 47 f) 8 s-8357b33 100 khz 3.3 v pwm cdrh8d28-470 9 s-8358b33 100 khz 3.3 v pwm/pfm 10 s-8357b50 100 khz 5.0 v pwm 11 s-8357f33 300 khz 3.3 v pwm cxlp120-220 ma2z748 f92 (6.3 v, 47 f) 12 s-8356m50 300 khz 5.0 v pwm/pfm 13 s-8357n33 600 khz 3.3 v pwm cdrh8d28-100 m1fh3 f93 (16 v, 47 f) 14 s-8357n50 600 khz 5.0 v pwm 15 s-8356q33 600 khz 3.3 v pwm/pfm 16 s-8356q50 600 khz 5.0 v pwm/pfm
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 54 the properties of the external parts are shown below. table 33 properties of external parts compornent product name manufacturer characteristics inductor cdrh104r-220 sumida corporation 22 h, dcr *1 = 73 m ? , i max. *2 = 2.5 a, component height = 4.0 mm cdrh104r-470 47 h, dcr *1 = 128 m ? , i max. *2 = 1.9 a, component height = 4.0 mm cdrh8d28-100 10 h, dcr *1 = 47 m ? , i max. *2 = 2.7 a, component height = 3.0 mm cdrh8d28-220 22 h, dcr *1 = 99 m ? , i max. *2 = 1.8 a, component height = 3.0 mm cdrh8d28-470 47 h, dcr *1 = 195 m ? , i max. *2 = 1.25 a, component height = 3.0 mm cxlp120-220 sumitomo special metals co., ltd. 22 h, dcr *1 = 590 m ? , i max. *2 = 0.55 a, component height = 1.2 mm diode m1fh3 shindengen electric manufacturing co., ltd. v f *3 = 0.3 v, i f *4 = 1.5 a ma2z748 matsushita electric industrial co., ltd. v f *3 = 0.4 v, i f *4 = 0.3 a f93 nichicon corporation 16 v, 47 f capacitor (output capacitance) f92 6.3 v, 47 f transistor (nch fet) s-90n0212sma seiko instruments inc. v dss *5 = 20 v max., v gss *6 = 12 v max., c iss *7 = 190 pf, r ds(on) *8 = 0.16 ? max. (v gs *9 = 2.5 v, i d *10 = 0.5 a) s-90n0312sma v dss *5 = 20 v max., v gss *6 = 8 v max., c iss *7 = 170 pf, r ds(on) *8 = 0.14 ? max. (v gs *9 = 2.5 v, i d *10 = 0.5 a) s-90n0442sua v dss *5 = 20 v max.,v gss *6 = 8 v max., c iss *7 = 390 pf, r ds(on) *8 = 0.07 ? max. (v gs *9 = 2.5 v, i d *10 = 2 a) *1. direct current resistance *2. maximum allowable current *3. forward voltage *4. forward current *5. drain source voltage *6. gate source voltage *7. input capacitance *8. drain source on-resistance *9. gate source voltage *10. drain current caution the values shown in the characteristics column of table 33 above are based on the materials provided by each manufacture. however, consider the characteristics of the original materials when using the above products.
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 55 2. output current (i out ) vs. efficiency ( ) characteristics, output current (i out ) vs. output voltage (v out ) characteristics the following shows the actual (a) output current (i out ) vs. efficiency ( ) characteristics and (b) output current (i out ) vs. output voltage (v out ) characteristics under the conditions of no. 1 to 16 in table 32 . condition 1 s-8357f33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 1 10 100 1000 0.1 [%] i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v in = 0.9 v v in = 1.8 v v in = 2.7 v 1 10 100 1000 0.1 i out [ma] v out [v] condition 2 s-8357f50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 1 10 100 1000 0.1 i out [ma] v out [v] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 3 s-8356m50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 4 s-8357b33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 56 condition 5 s-8358b33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 6 s-8357b50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 7 s-8357m50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 8 s-8357b33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 57 condition 9 s-8358b33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 10 s-8357b50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 11 s-8357f33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 12 s-8356m50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 58 condition 13 s-8357n33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 14 s-8357n50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 15 s-8356q33 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] v in = 1.8 v v in = 2.7 v 1 10 100 1000 0.1 i out [ma] 3.0 3.1 3.2 3.3 3.4 3.5 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 1.8 v v in = 2.7 v condition 16 s-8356q50 (a) output current (i out ) vs. efficiency ( ) (b) output current (i out ) vs. output voltage (v out ) 20 40 60 80 100 [%] 1 10 100 1000 0.1 i out [ma] v in = 3.0 v v in = 4.0 v 4.7 4.8 4.9 5.0 5.1 5.2 v out [v] 1 10 100 1000 0.1 i out [ma] v in = 3.0 v v in = 4.0 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller rev.4.2 _01 s-8355/56/57/58 series seiko instruments inc. 59 3. output current (i out ) vs. ripple voltage (vr) characteristics the following shows the actual output current (i out ) vs. ripple voltage (vr) characteristics and (b) output current (i out ) vs. output voltage (v out ) characteristics under the conditions of no. 1 to 16 in table 32 . condition 1 s-8357f33 condition 2 s-8357f50 0 50 100 150 vr [mv] v in = 0.9 v v in = 1.8 v v in = 2.7 v 1 10 100 1000 0.1 i out [ma] 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 3 s-8356m50 condition 4 s-8357b33 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v condition 5 s-8358b33 condition 6 s-8357b50 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 7 s-8356m50 condition 8 s-8357b33 0 50 100 150 vr [mv] v in = 2.0 v v in = 3.0 v v in = 4.0 v 1 10 100 1000 0.1 i out [ma] 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v
step-up, super-small package, 600 khz, pwm control or pwm/pfm switchable switching regulator controller s-8355/56/57/58 series rev.4.2 _01 seiko instruments inc. 60 condition 9 s-8358b33 condition 10 s-8357b50 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 11 s-8357f33 condition 12 s-8356m50 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 0 50 100 150 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 13 s-8357n33 condition 14 s-8357n50 20 40 60 80 100 0 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 0.9 v v in = 1.8 v v in = 2.7 v 20 40 60 80 100 0 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 2.0 v v in = 3.0 v v in = 4.0 v condition 15 s-8356q33 condition 16 s-8356q50 20 40 60 80 100 0 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 1.8 v v in = 2.7 v 20 40 60 80 100 0 vr [mv] 1 10 100 1000 0.1 i out [ma] v in = 3.0 v v in = 4.0 v

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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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