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s-8330/8331 series www.sii-ic.com step-up, for lcd bias supply, 1-channel switching regulator ? seiko instruments inc., 1996-2010 rev.6.0 _00 seiko instruments inc. 1 the s-8330/8331 series is a cmos pwm-control step-up sw itching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power mos fet (for s-8330 series) , and an error amplifier. the output voltage can adjust by built-in electric volu me circuit, and equip with shutdown function. the s-8330 series is low current consumption because of cmos st ructure , and a step-up switching regulator constructed by externally connecting only a coil, a capacitor and a diode. this feature, along with its 8-pin ssop package and a few external components, makes the s-8330 series ideal for lcd bias generators of portable equipment. for applications requiring a high output current, products used with an external transistor (s-8331 series) are also available. ? features ? maximum output voltage: 20 v to 30 v (2 v step) 12 v range can be adjusted by electric volume ? output voltage accuracy : 2.4% ? output current: 5 ma (v in = 5 v,v out = 30 v) ? low current consumption : during operation: 100 a (typ.) (v in = 5 v 180 khz) during shutdown: 1.0 a (max.) ? shutdown function: stepping up operation is stopped , and vout pin is shorted to gnd while shutdown. ? input voltage range: 2.0 to 9.0 v ? soft start function ? built-in cr oscillation circuit: oscillating frequency: 180 khz (typ.) (a series) oscillating frequency: 50 khz (typ.) (b series) ? 8-bit built-in electric volume circuit ? external transistor type is available (s-8331 series) ? lead-free *1 *1. refer to ? ? product name structure ? for details. ? applications ? power supplies for medium type or large type lcd panel ? power supplies for portable devices such as pagers, handy calculators, and remote controllers ? constant voltage power supplies for came ras, video equipment, and communication equipment ? package ? 8-pin ssop
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 2 ? block diagram cont reset sd vout vss v ref pwm control circuit + ? vin l ? + external transistor vdin vclk vstrb cl on/off vin rb cb ext l vss cr oscillation circuit (1) s-8330 series (2) s-8331 series figure 1 block diagram ? product name structure 1. product name s - 833 x x xx fs - t2 - g environmental code g: lead-free (for details, pleas e contact our sales office ) ic direction in tape specifications *1 package name (abbreviation) maximum output voltage product category a: fosc=180 khz b: fosc= 50 khz power transistor 0: built-in switch 1: external transistor *1. refer to the taping specific ations at the end of this book. 2. package drawing code package name package tape reel 8-pin ssop fs008-a-p-sd fs 008-a-c-sd fs008-a-r-sd 3. product list output voltage range (v) s-8330axxfs series s-8330bxxfs series s-8331axxfs series 8 to 20 s-8330a20fs-t2-g s-8330b20fs-t2-g s-8331a20fs-t2-g 10 to 22 s-8330a22fs-t2-g s-8330b22fs-t2-g s-8331a22fs-t2-g 12 to 24 s-8330a24fs-t2-g s-8330b24fs-t2-g s-8331a24fs-t2-g 14 to 26 s-8330a26fs-t2-g s-8330b26fs-t2-g s-8331a26fs-t2-g 16 to 28 S-8330A28FS-T2-G s-8330b28fs-t2-g s-8331a28fs-t2-g 18 to 30 s-8330a30fs-t2-g s-8330b30fs-t2-g s-8331a30fs-t2-g
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 3 ? pin configuration 8-pin ssop top view 8 7 6 5 4 1 3 2 figure 2 pin no. symbol description 1 vdin electric volume data input pin 2 vclk electric volume clock input pin 3 vstrb electric volume strobe signal input pin 4 v out output voltage pin 5 v in power supply pin 6 cont external inductor connection pin (note 1) ext external transistor connection pin (note 2 ) 7 off/on shutdown pin ?h?: normal operation (stepping up operation) ?l?: stop stepping up operation 8 v ss gnd pin note 1: s-8330 series: open drain output note 2: s-8331 series: cmos output
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 4 ? absolute maximum ratings (unless otherwise specified: ta=25 c) parameter symbol ratings unit v out pin voltage v out v ss ? 0.3 to 33 v cont pin voltage v cont v ss ? 0.3 to 33 v cont pin current i cont 300 ma ext pin voltage v ext v ss ? 0.3 to v out +0.3 v ext pin current i ext 50 ma input voltage v din , v clk , v strb , v in , v on/off v ss ? 0.3 to 10 v 300 (when not mounted on board) mw power dissipation p d 500 (note 1) mw operating temperature range t opr ? 20 to +70 c storage temperature t stg ? 40 to +125 c note 1: when mounted on board [mounted board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) board name : jedec standard51-7 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. (1) when mounted on board (2) when not mounted on board 0 50 100 150 600 400 200 0 power dissipation p d (mw) ambient temperature ta ( c) 500 300 100 0 50 100 150 300 200 100 0 power dissipation p d (mw) ambient temperature ta ( c) 400 figure 3 power dissipation of package
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 5 ? electrical characteristics 1. s-8330a series step-up switching regulator (unless otherwise specified: ta=25 c) items symbols conditions min. typ. max. unit mea.circ. s-8330a20fs 8 ? 20 s-8330a22fs 10 ? 22 output voltage range vout s-8330a24fs 12 ? 24 v 5 s-8330a26fs 14 ? 26 s-8330a28fs 16 ? 28 s-8330a30fs 18 ? 30 output voltage accuracy 2.4% % 5 input voltage vin 2.0 ? 9.0 v 2 current consumption 1 iss1 v in =5 v, v out = output voltage max. ? 100 200 a 4 current consumption 2 iss2 v in =2 v, v out = output voltage min. ? 50 100 a 4 current consumption during power off isss power off pin =vdin=0 v,v in =vclk=vstrb=5 v ? ? 1.0 a 4 switching current isw vcont=0.4 v 100 200 ? ma ? switching transistor leakage current iswq power off pin =0 v , vcont=9 v ? ? 1.0 a 3 s-8330a20fs ? 300 ? s-8330a22fs ? 330 ? line regulation vout1 v in =3 v to 6 v s-8330a24fs ? 360 ? mv 5 s-8330a26fs ? 390 ? s-8330a28fs ? 420 ? s-8330a30fs ? 450 ? load regulation vout2 v in =5 v i out =output voltage/2.4 m to output voltage/24 k ? 30 ? mv 5 s-8330a20fs ? 1.0 ? s-8330a22fs ? 1.1 ? output voltage s-8330a24fs ? 1.2 ? mv/ c 5 temperature coefficient vout/ ta ta= -20 c to +70 c s-8330a26fs ? 1.3 ? s-8330a28fs ? 1.4 ? s-8330a30fs ? 1.5 ? oscillating frequency fosc v out =output voltage 0.95 measure waveform at cont pin 144 180 216 khz 2 maximum duty ratio max duty v out =output voltage 0.95 measure waveform at cont pin 60 72 84 % 2 vsh1 vout =output voltage 0.95 v in 3.0 v 2.4 ? ? power off terminal vsh2 check oscillation at cont pin v in < 3.0 v 1.6 ? ? v 2 input voltage vsl v out =output voltage 0.95 check oscillation stop at cont pin ? ? 0.4 power off terminal input leakage current isl v in =9 v -1 ? 1 a 1 soft start time tss 1 3 6 ms ? efficiency effi ? 85 ? % 5
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 6 externally attached parts: coils : cd54 (47 h) of sumida corporation diodes : ma720 schottky type of matsus hita electric industrial co., ltd. capacitors: f93 tantalum type (two circuits of 50 v, 4.7 f are connected in parallel) of nichicon corporation v in =5 v, v out =vout max. i out = output voltage /24 k on/off=5 v,vdin=vclk=vstrb=0 v note: output voltage specified above is the typical value of the output voltage.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 7 2. s-8330b series step-up switching regulator (unless otherwise specified: ta=25 c) item symbol conditions min. typ. max. unit mea. cir. s-8330b20fs 8 ? 20 s-8330b22fs 10 ? 22 output voltage range vout s-8330b24fs 12 ? 24 v 5 s-8330b26fs 14 ? 26 s-8330b28fs 16 ? 28 s-8330b30fs 18 ? 30 output voltage accuracy 2.4% % 5 input voltage vin 2.0 ? 9.0 v 2 current consumption 1 iss1 v in =5 v, v out =output voltage max. ? 40 80 a 4 current consumption 2 iss2 v in =2 v, v out =output voltage min. ? 20 40 a 4 current consumption during power off isss power off pin =vdin=0 v,v in =vclk=vstrb=5 v ? ? 1.0 a 4 switching current isw vcont=0.4 v 100 200 ? ma ? switching transistor leakage current iswq power off pin=0 v , vcont=9 v ? ? 1.0 a 3 s-8330b20fs ? 300 ? s-8330b22fs ? 330 ? line regulation vout1 v in =3 v to 6 v s-8330b24fs ? 360 ? mv 5 s-8330b26fs ? 390 ? s-8330b28fs ? 420 ? s-8330b30fs ? 450 ? load regulation vout2 v in =5 v i out =output voltage/2.4 m to output voltage/24 k ? 30 ? mv 5 s-8330b20fs ? 1.0 ? s-8330b22fs ? 1.1 ? output voltage s-8330b24fs ? 1.2 ? temperature coefficient vout/ ta ta=-20 c to +70 c s-8330b26fs ? 1.3 ? mv/ c 5 s-8330b28fs ? 1.4 ? s-8330b30fs ? 1.5 ? oscillating frequency fosc v out =output voltage 0.95 measure waveform at cont pin 40 50 60 khz 2 maximum duty ratio max duty v out =output voltage 0.95 measure waveform at cont pin 60 72 84 % 2 vsh1 v out =output voltage 0.95 v in 3.0 v 2.4 ? ? power off pin vsh2 check oscillation at cont pin v in < 3.0 v 1.6 ? ? v 2 input voltage vsl v out =output voltage 0.95 check oscillation stop at cont pin ? ? 0.4 power off pin input leakage current isl v in =9 v -1 ? 1 a 1 soft start time tss 3 10 20 ms ? efficiency effi ? 85 ? % 5
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 8 externally attached parts: coils : cd54 (47 h) of sumida corporation diodes : ma720 schottky type of ma tsushita electric industrial co., ltd. capacitors: f93 tantalum type (two circuits of 50 v, 4.7 f are connected in parallel) of nichicon corporation v in =5v,v out =vout max. i out = output voltage /24 k on/off=5 v,vdin=vclk=vstrb=0 v note: output voltage specified above is the typical value of the output voltage.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 9 3. s-8331a series step-up switching regulator (unless otherwise specified: ta=25 c) item symbol conditions min. typ. max. unit mea. cir. s-8330a20fs 8 ? 20 s-8330a22fs 10 ? 22 output voltage range vout s-8330a24fs 12 ? 24 v 6 s-8330a26fs 14 ? 26 s-8330a28fs 16 ? 28 s-8330a30fs 18 ? 30 output voltage accuracy 2.4% % 5 input voltage vin 2.0 ? 9.0 v 2 current consumption 1 iss1 v in =5 v, v out =output voltage max. ? 50 100 a 4 current consumption 2 iss2 v in =2 v, v out =output voltage min. ? 25 50 a 4 current consumption during power off isss power off pin =vdin=0 v,v in =vclk=vstrb=5 v ? ? 1.0 a 4 output current at extpin iexth vext=v in -0.4 v 3.0 5.0 ? ma ? iextl vext=0.4 v 5.0 8.0 ? ma ? s-8331a20fs ? 300 ? s-8331a22fs ? 330 ? line regulation vout1 v in =3 v to 6 v s-8331a24fs ? 360 ? mv 6 s-8331a26fs ? 390 ? s-8331a28fs ? 420 ? s-8331a30fs ? 450 ? load regulation vout2 v in =5 v i out =output voltage/2.4 m to output voltage/24 k ? 30 ? mv 6 s-8331a20fs ? 1.0 ? s-8331a22fs ? 1.1 ? output voltage s-8331a24fs ? 1.2 ? temperature coefficient vout/ ta ta=-20 c to +70 c s-8331a26fs ? 1.3 ? mv/ c 6 s-8331a28fs ? 1.4 ? s-8331a30fs ? 1.5 ? oscillating frequency fosc v out =output voltage 0.95 measure waveform at ext pin 144 180 216 khz 2 maximum duty ratio max duty v out =output voltage 0.95 measure waveform at ext pin 60 72 84 % 2 vsh1 v out =output voltage 0.95 v in 3.0 v 2.4 ? ? power off pin vsh2 check oscillation at ext pin v in <3.0 v 1.6 ? ? v 2 input voltage vsl v out =output voltage 0.95 check oscillation stop at ext pin ? ? 0.4 power off pin input leakage current isl v in =9 v -1 ? 1 a 1 soft start time tss 1 3 6 ms ? efficiency effi ? 85 ? % 6
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 10 externally attached parts: coils : cd54 (47 h) of sumida corporation diodes : ma720 schottky type of mats ushita electric industrial co., ltd. capacitors: f93 tantalum type (two circuits of 50 v, 4.7 f are connected in parallel) of nichicon corporation. transistors: 2sd1624 of s anyo electric co., ltd. base resistance (rb):1.0 k base capacitor (cb):2200 pf (ceramic type) v in =5 v, v out =vout max. i out = output voltage/24 k on/off=5 v, vdin=vclk=vstrb=0 v note: output voltage specified above is the typical value of the output voltage.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 11 4. characteristics common to s-8330/31series electric volume (unless otherwise specified: ta=25 c) item symbol conditions min. typ. max. unit mea. cir. s-833xx20fs 8 ? 14 14 ? 20 s-833xx22fs 10 ? 16 16 ? 22 s-833xx24fs 12 ? 18 output voltage range (note 1) vout 18 ? 24 v 5 (6) s-833xx26fs 14 ? 20 20 ? 26 s-833xx28fs 16 ? 22 22 ? 28 s-833xx30fs 18 ? 24 24 ? 30 potential division accuracy ? ? 2.4 % 5 (6) electric volume resolution ? 1/256 ? 5 (6) error in linearity (note 1) ? ? 1/2 lsb 5 (6) data setup time tsc 0.5 ? ? a ? data hold time thc 0.5 ? ? a ? vclk falling edge to vstrb rising edge tss 0.5 ? ? a ? vstrb pulse width tda 0.5 ? ? a ? vstrb falling edge to vclk rising edge ths 0.5 ? ? a ? vclk pulse width tdc 0.5 4.17 ? a ? vclk period ttc 5 8.33 ? a ? vdin,vclk,vstrb input voltage ?h? level vshc1 v in 3.0 v 2.4 ? ? vshc2 v in < 3.0 v 1.6 ? ? v ? vdin,vclk,vstrb input voltage ?l? level vslc ? ? 0.2 vdin,vclk,vstrb input leakage current islc v in =9 v -1 ? 1 a 1 tss ths tda ttc tdc thc d1 d7 (next msb) d0 vstrb vclk vdin tsc figure 4 data input timing note 1: an electric volume has 8-bit resolution. however, its error in linearity may exceed 1/2lsb only before and after switching from 127 to 128 (from 01111111 to 10000000). when the electric volume is used within the variable range of 12 v, it s error in linearity corresponds to 6 bits (2.4% potential division accuracy is ensured).
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 12 ? measurement circuits meas pin a 1. vin other pins open on/off vss a v vss *300 not needed in the *s-8331 series. *5 oscilloscope on/off cont(ext) vin 2. vdin vclk vstrb vout vss on/off cont 3. vin a vdin vclk vstrb vout vss on/off cont(ext) vin 4. a vdin vclk vstrb vout *300 not needed in the *s-8331 series. *5 a
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 13 vss on/off cont 5. vin ? v + vdin vclk vstrb vout ? + vss on/off 1k 2200pf ext 6. vin ? v + vdin vclk vstrb vout ? + figure 5 measurement circuits
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 14 ? operation 1. step-up dc-dc converter the s-8330/31 series is a dc-dc converter using a pulse width modulation method (pwm) with low current consumption. convent ional pfm dc/dc converters have a drawback. namely, an increase in the ripple voltage occurs because pulses are skipped when low output load current flows and the ripple frequency of the output voltage varies. in t he s-8330/31 series, the pulse width varies in the range of 0 % to 72 % depending upon the load current, but the switching frequency does not vary. this allows the ripple voltage due to switching to be reduced with a filter. also, the internal soft start circuit controls the rush current and the output voltage overshoot to be generated when the ic starts the step-up operation by setting the power off pin to "h" le vel. at powering on the ic, the rush current flows to charge up capacitive components of output capacitor "c out " and load via coils and diodes. on/off electric volume cont m1 osc di l v in v out c out - ? + + figure 6 step-up dc-dc converter the following are fundamental equations of step-up swit ching regulators [ (1) to (7) ] (see figure 6). the pin voltage at cont immediatetly after m1 is turned on (current i l which flows into l is zero): v a = v s (1) (v s : not saturated voltage of m1) change in i l with time: l vv l v dt di sinll ? == (2) integreation of the above equation (i l ) is as follows: t l vv i sin l ? ? ? ? ? ? ? ? = (3) i l flows into l during t on . the time is determined depending upon the oscillating frequency of the osc. the peak current (i pk ) after t on : on sin pk t l vv i ? ? ? ? ? ? ? ? = (4) the energy stored in l is represented by 1/2 y l (i pk ) 2 . when m1 is turned off (t off ), the energy stored in l is transmitted through a diode. then reverse voltage (v l ) generates.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 15 v l : v l = (v out + v d ) ? v in (5) (v d ; diode forward voltage) the pin voltage at cont rises only by the voltage corresponding to v out +v d . a change in the current (i l ) which flows through a diode into v out during t off : l vvv l v dt di ind out ll ?+ == (6) integration of the above equation is as follows : t l vvv ii ind out pkl ? ? ? ? ? ? ? ?+ ?= (7) during t on , the energy is stored in l and is not transmitted to v out . when output current (i out ) flows from v out , the energy of the capacitor (c out ) is consumed. as a result, the pin voltage at c out decreases and goes to the lowest value after t on . when m1 is turned off, the energy stored in l is transmitted through a diode into c out , and the pin voltage at c out rises drastically. v out is a time function that indicates the maximum value (ripple voltage v p-p ) when the current flowing into v out through diode and load current i out match. next, the ripple voltage is found out based on the following equations: i out when the time is set to t 1 until v out reaches the maximum level immediately after t on : 1 ind out pk out t l vvv ii ? ? ? ? ? ? ? ?+ ?= (8) ? ? ? ? ? ? ? ? ?+ ??= in d out out pk1 vvv l )ii(t (9) t off when i l =0 (the energy of the inductor is completely transmitted). based on equation (7) pk off ind out i t vvv l = ? ? ? ? ? ? ? ? ?+ (10) when substituting equation (10) for equation (9): off pk out off1 t i i tt ? ? ? ? ? ? ? ? ? ?= (11) electric charge q 1 which is charged in c out during t 1 : 2 1 ind out 1pk 1t 0 in d out 1t 0 pkl 1t 0 1 t 2 1 l vvv titdt l vvv dtidtiq ? ?+ ??=? ?+ ??== ? (12) when substituting equation (12) for equation (9): () 1 out pk 1out pk pk t 2 ii tii 2 1 i1q ? + =???= (13) a rise in voltage (v p-p ) due to q 1 : 1 out pk out out 1 pp t 2 ii c 1 c q v ? ? ? ? ? ? ? + ?= = ? (14)
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 16 when taking into consideration esr (electric series resistance) resr of iout and cout during t1: out 1out esr out pk out pk out out 1 pp c ti r 2 ii 1t 2 ii c 1 c q v ? ?? ? ? ? ? ? ? + +? ? ? ? ? ? ? + ?= = ? (15) when substituting equation (15) for equation (11): esr out pk out off pk 2 out pk pp r 2 ii c t i2 )ii( v ? ? ? ? ? ? ? + +? ? = ? (16) the effective methods to reduce the ripple voltage ar e to maximize the capacitance of the capacitor connected to the output pin and to minimize esr.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 17 2. power off pin ( off/on pin) this pin stops and starts set up operation. turnig the power off pin to ?l? stops the operation of the internal circuits excluding the electric volume, minimizes current consumption and short-curcuits v out pin to v ss . at this time, current flows via coils and a diode at the input side into v ss . therefore, a switch to cut off the current is needed. figure 7 shows a circuit example us ing the nec 2sj356 (pch mos fet) as a current cutting switch. this circuit example turns on and off the 2sj356 in connection with the reset signal to the power off pin using a small signal transistor m n (nch mos fet). a zenor diode (zd) is used for the purpose of clamping voltage so as not to apply high voltage (20v or more) of the rated voltage between the gate and the source of the 2sj356. ho wever, when the circuit is used at 20 v or below, a zenor diode is not needed. invalid current flowing into resistors r a , r b during step-up operation may affect the efficiency. set r a , r b to the maximum level. if you set the resistance of r a to the high value, a drop in the voltage occurs in resistor r a due to off current of m n and the current cutting switch 2sj356 does not normally function. be careful (note that the efficiency characteristics shown in the reference data were measured without attaching a current cutting sw itch and is different from that shown in this example). cont reset on/off m n 2sj356 r b :1m zd:15v v out sbd r a : 500k v ss v in l ? + cl figure 7 circuit example using 2sj356 the power off pin is configured as shown in figure 8. do not use this circuit under the floating state because the power off pin is not internally pull ed up nor pulled down. if 0.4 v to 2.4 v when v in 3.0 v, 0.4 v to 1.6 v when v in < 3.0v are applied, current consumpt ion increases. do not apply voltage. when the power off pin is not used, connect it to v in pin. the power off pin is not provided with hysteresis. power off pin cr osc output voltage ?h? operation setting value ?l? stop v ss figure 8 on/off vin vss
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 18 3. electric volume the s-8330/31 series incorporates an electric volume with an 8-bit shift register and an 8-bit latch. the output voltage is variable in the width of 12 v. the output voltage can be held in the data transmission mode because the data read in the shi ft register is fetched into the latch by unshyncronized strobe input. figure 9 shows a block diagram and timing charts . 8-bit shift register reset vout vstrb vclk vdin 8-bit latch electric volume d0 d1 d2 d3 d4 d5 d6 d7 (lsb) read setting value min. value vout vstrb hold reset hold vclk vdin (msb) figure 9 block diagram and timing vdin: inputs data to the electric volume. ?data 1? is input at ?h?level; ?d ata 0? is input at ?low? level. vclk: inputs clock to the electric volume. fetches data at vdin pin into the shift regist er at the rising edge of clocks. when clocks of over 8 bits are input, the read data is sh ifted in succession for each clock, and data corresponding to 8 bits which was input lastly is valid. vstrb: inputs strobe signal. the contents of the shift register are latched by turning the strobe signal to ?h?. when the data fetched into the latch is directly transmi tted to the electric volume, the output voltage changes. data in the latch is held by turning the strobe signal to ?l?. 2lsb (93.8mv) 1/2lsb (23.5mv) output voltage (v) electric volume data (dec) 254 255 128 127 0 1 1/2lsb the electric volume has 8-bit resolution. an error in linearity may exceed 1/2lsb (23.5 mv) only before or after data changeover of 127 128 (01111111 10000000) (see figure 9). the error in linearity corresponds to 6 bits (93.8 mv) when used in the 12 v variable range. in an application where the variable range of output voltage is 6 v or less, it is possible to use it with high linearity accuracy with appropriate product selection. for example, if you want to change output voltage within the range from 12 v to 18 v, select the s-8330a24fs and use it within the range of 0 127 (00000000 01111111). if so, high linearity accuracy (within1/2lsb) can be obtained. figure 10 linearity accuracy
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 19 the contents of the register must be reset because they are uncertain when powering on. if the power off pin is ?l? level and step-up operation stops, the cont ents of the register are held inside the electric volume by applying voltage of 2 v or more between v in to v ss . data write and reset operation in the register are also available under this state. the register is reset by setting vclk to ?h? and vstrb to ?h?. the output voltage is set to the minimum va lue. power on under the state where the power off pin is being set to ?l?. next, set vclk to ?h? and vst rb to ?h? to reset the contents of the register. then, start step-up operation under the state where the power off pin is being set to ?h?. [ note ] if you start step-up operation without resetting t he contents of the register after powering on, the maximum voltage is output to v out , and the connected device or instrument may be broken or damaged. it is recommended to connect a pull down resistor to the power off pin if a problem may occur due to the maximum output voltage. ? recommended selection of series products and external parts 1. how to select the series products the s-8330/31 series comes in three types dependi ng upon the switching transistor attachment method (internal or external) and the oscillating frequenc y. as shown in figure 11, respective output current targets differ to ensure high efficiency within the respective output current range. select an appropriate series which meets your output current requirements (see the reference data for the output current and efficiency characteristics). c s-8331a series: the switching transistor is ex ternally attached and the oscillating frequency is 180 khz (typ.). its target is the output current of 10 ma or more. high output voltage of 30 v or more is available by only attaching a simple external circuit to the s-8331a series (see the s-8330 series application circuit shown in figure 17). d s-8330a series: the switching transistor is built in and the oscillating frequency is 180 khz (typ.). its target is the output current ranging from 1 ma to 10 ma. the oscillating frequency of the s-8330a series is higher than that of the s-8330b series. this minimizes ripple and ensures excellent transitory response characteristics. e s-8330b series: the switching transistor is built in and the oscillating frequency is 50 khz (typ.). its target is output current of 1 ma or le ss. the self current consumption of the s-8330b series is less than that of t he s-8330a series. this ensures high efficiency in the output current of about 0.1 ma or less. s-8330b s-8330a a switch transistor is built in 8v 30v (f=180khz) (f=180khz) (f=50khz) s-8331 a switch transitor is externally attached 1ma 10ma 100ma figure 11 s-8330/8331 series depending upon output current output voltage output current
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 20 2. inductor the inductance value greatly affects i out and efficiency . figure 12 shows the dependency of i out , of the s-8330a and the s-8330b on ?l?. the smaller value l, the larger peak current i pk . i out reaches the maximum value in a certain value l. when decreasing value l further, the switching transis tor falls short of the current drive ability and i out decreases; when increasing value l, a loss due to i pk of the switching transistor decreases and the efficiency reaches the maximum in a certain value l; when increasing value l, a loss due to a series resistor of the coils increases. this worsens the efficiency. so, it is recommended to set value l to 22 to 100 h in the s-8330a and 47 to 220 h in the s-8330b, respectively. determine value l referring to the reference data bec ause the maximum output current actually differs depending upon the input voltage. pay attention to the allowable current of the induc tor when selecting an appropriate inductor. if current exceeding this allowable current flows into the induc tor, magnetic saturation occurs in the inductor. this may lead to a serious drop in the efficienc y and damage of the ic due to exessive current. select an appropriate inductor so that i pk does not exceed this allowable current. current i pk in the non-continuous mode is represent ed by the following equation. lf )vvv(i2 i osc ind out out pk ? ?+ = (a) (17) where f osc is the oscillating frequency. set v d to approximately 0.4 v. for example, when you want a power source of input voltage v in =5 v, output voltage v out =30 v, and load current i out =5 ma, the s- 8330a30fs responds to your requirements because f osc =180 khz. when you set value l to 47 h, i pk =174 ma is found out as shown in equation (17). as a result, you can select an inductor for which value l is 47 h and the allowable current is 174 ma or more. a limitation relating to the maximum value i pk lies in the ic itself. always use current i pk at 500 ma or less. figure 12 dependency of inductance on maximum output current and efficiency s-8330a i out lqh4n i out 22 100 recommended range l value ( h) v out =18v, v in =5.0v s-8330b i out lqh4n i out 47 220 l value ( h) v out =18v, v in =5.0v recommended range
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 21 3. diode always use a diode which meets the following conditions. z low forward voltage: v f <0.3 v z low switching speed: 500 ns max. z reverse direction voltage: v out +v f or more z rating current: i pk or more. 4. capacitor (c in , c out ) capacitor (c in ) at the input side improves the effi ciency by reducing the power impedance and stabilizing the input current. select avalue (c in ) depending upon the impedance of the power supply used. the standard capacitance is approximately 10 f. select a capacitor (c out ) at the output side with small esr (equivalent series resistance) and lar ge capacitance to stabilize the ripple voltage. the standard capacitance is approximately 10 f. it is particularly recommended to use a tantalum electrolytic capacitor with excellent low te mperature and leakage current characteristics. 5. externally-attached tr ansistors (s-8331 series) the output current can be increased by externally attaching a transistor to the s-8331 series. a bipolar (npn) type or an enhancement (nch) mos fet type of transistor can be used as an external transistor. 5.1 bipolar npn type figure 16 shows a circuit example using the 2sd1624 manufactured by sanyo electric co., ltd. as a bipolar transistor (npn). the drive ability to increase output current is determined by values h fe and rb of the bipolar transistor. a peripheral circui t example of the transistor is shown in figure 13. it is recommended to select value rb of approximately 1 k . find necessary base current i b from the bipolar transistor h fe using i b =i pk /h fe , exth in i 4.0 ib 7.0v rb ? ? = and select small value rb. small value rb can increase the output current, but may worsen the efficiency. also current may flow on the pulse or the voltage may drop due to wiring resistor. so, find the optimum value with experiments. attaching a speed-up capacitor cb to the resist or rb reduces switching loss and increases the efficiency. value cb: 7.0frb2 1 cb osc figure 13 external transistor peripheral circuit i pk ext nch v in pch rb s-8331 2200pf 1k
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 22 5.2 enhancement mos fet type figure 14 shows a circuit example using the 2sk 2159 manufactured by nec electronics corporation as a mos fet transistor (nch). use an nch power mos fet as a mos fet. the ext pin in the s- 8331 series can drive a mos fet with approx.1000 pf gate capacitance. the on reisistor of the mos fet depends upon a difference between voltage input voltage v in and the threshold voltage of the mos fet and thereby affects the output amperage and the efficiency. the gate voltage and the current of the mos fet are supplied by input voltage v in . so pay attention if the i nput voltage is low. also note that the ic will not function if the threshold voltage of the mos fet is higher than the input voltage. reset on/off zd:15v r a r b m n 2sj356 sbd v out v ss v in l ? + cl ext 2sk2159 figure 14 circuit exam ple using the 2sk2159
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 23 ? standard circuits cont reset on/off zd sd v out v ss cr oscillator vref pwm controller + ? v in l ? + vdin vclk vstrb cl figure 15 s-8330 series reset on/off zd sd v out v ss cr oscillator v ref pwm controller + ? ? + vdin vclk vstrb cl v in external tr rb cb ext l figure 16 s-8331 series (1) s-8330 series (2) s-8331 series
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 24 ? precautions z mount capacitors, diodes, coils and other co mponents as near as possible to the the ic. z inherent ripple voltage or spike noise may generate in the switching regulator. because it greatly depends upon the coils and the capacitors you use, check it using an actually-mounted model. z make sure that a loss in the switching transisto r (particularly at high temperatures) does not exceed the allowable power dissipation. z configure parts and components so that the line to the vss pin (indicated by the bold line shown in figure 17) becomes short as much as possible. if a resistor and/or an inductance component stays on the line, the vss potential of the ic varies depending upon the switching current. s-8330 series cpu cont vss vss vdin vin v out vclk vstrb on/off ? + figure 17 s-8330 series application circuit z when switching the output voltage by the electric volume, the so ft start does not function. pay attention to overshoot occuring when increasing t he output voltage with a large width (refer to 5. output voltage changeover shown in the transitory response characteristics). z do not apply an electrostatic discharge to this ic that exceeds the performanc e ratings of the built-in electrostatic protection circuit. z seiko instruments inc. shall not be resposible for any patent infringement by products including the s-8330/8331 series in connection with the met hod of using the s-8330/8331 series in such products, the product specif ications or the country of destination thereof.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 25 ? application circuits 1. large size lcd panel drive power supply this is a circuit example to drive a large size lcd panel (40 v/20 ma) at a 5-v power (5 v10%). s-8331a30fs on/off tr.3 tr.2 tr.1: 2sd1624 cf ra: 180k rb: 600k zd:15v sd: ma789 to 40v v out v ss ? + f93/ 4.7 f 2 v in ext l 1k 2200 p f vdin vclk vstrb figure 18 large size lcd panel drive power supply this is an output voltage step-up circuit using the s- 8331 series. 30 v or more output voltage, i.e., the maximum voltage of the s-8330/8331 series, is avail able by dividing the output voltage by external resistors ra and rb and feeding back to v out pin. in the s-8331 series the internal impedance of v out pin varies by switching the electric volume. ther efore, a small singal npn transistor (tr. 3) is needed between the external voltage dividing resistor and v out pin to convert the impedance. the output voltage is represented by equation (18). output voltage = ? ? ? ? ? ? ? + rbra rb (v out +v be ) (18) v out : s-8331 v out setting voltage v be : voltage between the base and the emitter of tr. 3 pay attention to the following pr ecautions when using this ic. ? make sure that the switching transistor (tr.1) and a schottky diode (sd) have sufficient resistance against high output voltage you use. for example, the 2sd1624 manufactured by sanyo electric co., ltd. and the ma789 manufactured by matsushita electric industrial co., ltd. are used in this circuit example for a switching transis tor and a schottky diode, respectively. ? when stopping step-up operation from the step-up operation state using the power off pin, v out pin is short-circuited to v ss by an nch transistor. because of this, the output voltage is temporarily added to the area between the collector and the emitter of the transistor (tr. 3). always use a small signal transistor which is sufficient enough to withstand high output voltage (tr. 3). ? the output voltage fails to stabilize when the output curr ent falls short to 1 ma or less. in this case, add a capacitor cf between the output line and the v out pin. the recommended capacitance of the capacitor is approx. 0.01 f. select the best capacitance after checking it under actual operation conditions.
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 26 2. medium size lcd panel drive power supply for pda voltage suitable for smart addressing (sa) and multiple line addressing (a) drive generates from a 3 v- or 5 v-power supply. the following is a circui t example and its characterist ics, targeted at positive voltage of approx. +15 v/500 a and negative voltage of approx. -9 v/500 a. cont s-8330b vss vdin v in v out vclk vstrb on/off ? + ? + ? + vin f93 co+ co- /10 sumida/ 10 20 12 +15v ? 9v ma720 ma720 100 h /10 f93 /10 f93 cee93 +vout ? vout v out=15v set 1 s t side 3rd 2 n d side figure 19 medium size lcd panel drive power supply for pda output vol. vout (v) 14.6 14.8 15.0 15.2 15.4 0.01 0.1 1 10 100 output current i out (ma) v out =+15v vin=2.8v vin=3.8v vin=5.0v output current - output voltage characteristics (output current increase) output current - output voltage characteristics (output current increase) ? 9.4 ? 9.2 ? 9.0 ? 8.8 ? 8.6 0.01 0.1 1 10 100 vin=2.8v vin=3.8v vin=5.0v v out = ? 9v output vol. vout (v) output current i out (ma) 40 50 60 70 80 90 0.01 0.1 1 10 100 vin=2.8v vin=3.8v vin=5.0v output current - efficiency characteristics (output current increase) efficiency (%) output current i out (ma) this circuit stablilizes the positive output voltage +vout in the s-8330b series. the negative output voltage -vout is determined and stabilized by the wiri ng ratio at the second and third sides in the transducer manufactured by sumida corporation (cee93 6375-002 non-gap type) when the output current at the positive side is the sa me as that at the negative side. also this circuit is targeted at applications at low load. the use of a 50 khz product with low switching frequency improves the efficiency at load of approx. 500 ma.
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 27 pay attention to the following precautions when using it. ? generally, the allowable current level of the thin transducer (cee93 equivalent) is lower than that of the thin coil (cd54 equivalent). make sure that the current flowing into the transducer under the specified operational conditions does not exceed t he allowable current. for example, if load current is larger than 5 ma in the above circ uit, magnetic saturation occurs and the ic may be damaged at the worst. ? when using an external gap-type transducer, t he stability in the negative output voltage may worsen.
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 28 ? temperature characteristics i ss1 ,i ss2 ? temp s-8330a 0 20 40 60 80 100 120 140 160 180 -40 -20 0 20 40 60 80 100 ta (oc) i ss1 ( a ) i ss1 :v in =2v,v ou t =8v i ss2 :v in =5v, v out =30v v in =9v v in =5v v in =2v i ss1 ,i ss2 ? temp s-8331a 0 2 0 4 0 6 0 8 0 100 120 140 160 180 -40 -20 0 20 40 60 80 100 ta (oc) i ss1 ( a) i ss1 :v i n =2v,v ou t =8v i ss2 :v in =5v,v ou t =30v v in =9v v in =5v v in =2v i sss ? temp s-8330a 0.00 0.02 0.04 0.06 0.08 0.10 -40 -20 0 20 40 60 80 100 ta ( c) i sss ( a) v in =9v v in =5v v in =2v i sss ? temp s-8331a 0.00 0.02 0.04 0.06 0.08 0.10 -40-200 20406080100 ta ( c) i sss ( a) v in =9v v in =5v v in =2v i swq ? temp s-8330a/b 0.00 0.02 0.04 0.06 0.08 0.10 -40 -20 0 20 40 60 80 100 ta ( c ) i swq ( a ) v in =2,5,9v maxduty ? temp s-8330a/31a 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 ta ( c ) maxduty (%) v in =2v v in =5v v in =9v vout=18v ? power supply dependency characteristics f osc ? v in s-8330a/31a 140 150 160 170 180 190 200 210 220 23456789 vin (v) f osc (khz) ta=-40 ta=85 ta=25 i sw ? v in s-8330a/b 0 50 100 150 200 250 300 350 23456789 vin (v) i sw (ma) v out =18v ta=-40 ta=85 ta=25
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 29 i exth ? v in s-8331a 0 1 2 3 4 5 6 7 8 9 10 23456789 v in (v) i exth (ma) ta=-40 ta=85 ta=25 i extl ? v in s-8331a 0 1 2 3 4 5 6 7 8 9 10 23456789 v in (v) i extl (ma) ta=-40 ta=85 ta=25 v sh1,2 ? v in s-8330a/b/31a 0.60 0.80 1.00 1.20 1.40 1.60 23456789 v in (v) v sh1,2 (v) ta=-40 ta=25 ta=85 vsl ? vin s-8330a/b/31a 0.40 0.50 0.60 0.70 0.80 0.90 23456789 v in (v) v sl (v) ta=85 ta=25 ta=-40 v shc1,2 ? v in s-8330a/b/31a 0.60 0.80 1.00 1.20 1.40 1.60 23456789 v in (v) v shc1 , 2 (v) ta=85 ta=25 ta=-40 v shl ? v in s-8330a/b/31a 0.40 0.50 0.60 0.70 0.80 0.90 23456789 v in (v) v shl (v) ta=85 ta=25 ta=-40
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 30 ? transitory response characteristics 1. powering on (v in : 0v 5.0 v) s-8330a30 (light load : i out =1ma) t (1msec/div) output vol. (5v/div) input vol. (2.5v/div) v out =18v 0v 20v 0v 5v t (1msec/div) output vol. (5v/div) input vol. (2.5v/div) v out =18v 0v 20v 0v 5v s-8330a30 (heavy load : i out =1ma) s-8331a30 (light load i out =1ma) t (1msec/div) output vol. (5v/div) input vol. (2.5v/div) v out =18v 0v 20v 0v 5v s-8331a30 (heavy load i out =20ma) t (1msec/div) output vol. (5v/div) input vol. (2.5v/div) v out =18v 0v 20v 0v 5v 2. power off pin response (von/off=0 5.0 v) s-8330a30 (light load : i out =1ma) t (1msec/div) output vol. (5v/div) power off pin voltage v in =5v,v out =18v 0v 20v 0v 5v s-8330a30 (heavy load : i out =10ma) t (1msec/div) output vol. (5v/div) 0v 20v 0v 5v v in =5v,v out =18v power off pin voltage s-8331a30 (light load i out =1ma) t (1msec/div) output vol. (5v/div) power off pin voltage v in =5v,v out =18v 0v 20v 0v 5v s-8331a30 (heavy load out =20ma) t (1msec/div) output vol. (5v/div) power off pin voltage 0v 20v 0v 5v v in =5v,v out =18v
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 31 3. load variations s-8330a30 ( i out :0.01m 1ma) t (5msec/div) output vol. (50mv/div) load current v in =5v,v out =18v s-8330a30 ( i out :1ma 0.01ma) t (5msec/div) output vol. (50mv/div) load current v in =5v,v out =18v s-8331a30 ( i out :0.01ma 1ma) t (5msec/div) output vol. (50mv/div) load current v in =5v,v out =18v s-8331a30 ( i out :1ma 0.01ma) t (5msec/div) output vol. (50mv/div) load current v in =5v,v out =18v 4. power supply variations s-8330a30 ( vin:2.4v 3.5v) t (5msec/div) output vol. (50mv/div) input vol. (0.5v/div) i out =1ma,v out =18v s-8330a30 ( vin:3.5v 2.4v) t (5msec/div) output vol. (50mv/div) input vol. (0.5v/div) i out =1ma,v out =18v s-8331a30 ( v in :2.4v 3.5v) t (5msec/div) output vol. (50mv/div) input vol. (0.5v/div) i out =1ma,v out =18v s-8331a30 ( v in :3.5v 2.4v) t (5msec/div) output vol. (50mv/div) input vol. (0.5v/div) i out =1ma,v out =18v
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 32 5. output voltage changeover s-8330a20 (v out :8v 14v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =1ma 8v 14v 0v 5v s-8330a20 (v out :14v 8v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =10ma 8v 14v 0v 5v s-8330a30 (v out :18v 24v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =1ma 18v 24v 0v 5v s-8330a30 (v out :24v 18v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =10ma 18v 24v 0v 5v s-8331a20 (v out :8v 14v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =1ma 8v 14v 0v 5v s-8331a20 (v out :14v 8v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =20ma 8v 14v 0v 5v s-8331a30 (v out :18v 24v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =1ma 18v 24v 0v 5v s-8331a30 (v out :24v 18v) t (5msec/div) output vol. (2v/div) strb pin vol. v in =5v, i out =20ma 18v 24v 0v 5v
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 33 ? reference data the reference data is used to properly determi ne the best external parts. tables 1 and 2 list characteristic data of parts recommended to respond to the wide variety of applications. table 1 recommended parts 1 no. product v out l model value l diode c out remark (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) s-8330a20 s-8330a30 s-8330a20 s-8330a30 s-8330b30 s-8330a20 s-8330a30 s-8330b30 8 v 18 v 30 v 8 v 18 v 30 v 18 v 8 v 18 v 30 v 18 v cd54 lqh4n cd54 lqh4n 47 h 22 h 100 h 100 h 47 h 100 h ma720 4.7 f 2 output c urrent, efficiency ripple voltage table 2 recommended parts 2 part product manufacturer value l dc resistor max. p. c. diameter height cd54 sumida corporation 22 h 0.18 1.11a 5.8 mm 4.5 mm 47 h 0.37 0.72a 100 h 0.70 0.52a inductor lqh4n murata manufacturing co., ltd. 22 h 0.94 0.32a 4.5 mm 2.6 mm 47 h 1.5 0.22a 100 h 2.5 0.16a 220 h 5.4 0.11a diode ma720 matsushita electric industrial co., ltd. forward current 500 ma (vf=0.55 v) output capacitor f93 nichicon corporation external transistor 2sd1624 sanyo electric co., ltd. (1) 7.6 7.8 8.0 8.2 8.4 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=7v v out =8v s-8330a20 (cd54:47 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=7v v out =8v s-8330a20 (cd54:47 h) output current ? efficiency characteristics (output current increase) efficiency (%)
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 34 (2) 17.6 17.8 18.0 18.2 18.4 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=9v v out =18v output vol. v out (v) s-8330a30 (cd54:47 h) output current ? output voltage characteristics (output current increase) 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (cd54:47 h) output current ? ef ficiency characteristics (output current increase) efficiency (%) (3) 29.6 29.8 30.0 30.2 30.4 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=9v v out =30v s-8330a30 (cd54:47 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) vin=2v vin=5v vin=9v v ou t =30v s-8330a30 (cd54:47 h) output current ? eff iciency characteristics (output current increase) efficiency (%) (4) 7.6 7.8 8.0 8.2 8.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=7v v ou t =8v s-8330a20 (lqh4n:47 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=7v v ou t =8v s-8330a20 (lqh4n:47 h) output current ? ef ficiency characteristics (output current increase) efficiency (%)
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 35 (5) 17.6 17.8 18.0 18.2 18.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (lqh4n:47 h) output current ? output voltage characteristics (output current increase) output v ol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (lqh4n:47 h) output current ? efficiency characteristics (output current increase) efficiency (%) (6) 29.6 29.8 30.0 30.2 30.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =30v s-8330a30 (lqh4n:47 h) output current ? output voltage characteristics (output current increase) output v ol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =30v s-8330a30 (lqh4n:47 h) output current ? ef ficiency characteristics (output current increase) efficiency (%) (7) 17.6 17.8 18.0 18.2 18.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (lqh4n:22 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (lqh4n:22 h) output current ? efficiency characteristics (output current increase) efficiency (%)
step-up, for lcd bias supply, 1-channel switching regulator s-8330/8331 series rev.6.0 _00 seiko instruments inc. 36 (8) 17.6 17.8 18.0 18.2 18.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (lqh4n:100 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v ou t =18v s-8330a30 (lqh4n:100 h) output current ? efficiency characteristics (output current increase) ef f ic ie n c y (%) (9) 17.6 17.8 18.0 18.2 18.4 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v ou t =18v s-8330b30 (lqh4n:100 h) output current ? output voltage characteristics (output current increase) output vol. v out (v) 50 60 70 80 90 100 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v ou t =18v s-8330b30 (lqh4n:100 h) output current ? ef ficiency characteristics (output current increase) efficiency (%) (10) (11) 0 0 50 100 150 200 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=7v v out =8v s-8330a20 (cd54:47 h) output current ? ripple voltage characteristics (output current increase) ripple voltage vr (mv) 0 50 100 150 200 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =18v s-8330a30 (cd54:47 h) output current ? ripple voltage characteristics (output current increase) ripple voltage vr (mv)
step-up, for lcd bias supply, 1-channel switching regulator rev.6.0 _00 s-8330/8331 series seiko instruments inc. 37 (12) (13) 0 50 100 150 200 0.01 0.1 1 10 100 output current i out (ma) vin=2v vin=5v vin=9v v out =30v s-8330a30 (cd54:47 h) output current ? ripple voltage characteristics (output current increase) ripple voltage vr (mv) 0 50 100 150 200 0.01 0.1 1 10 100 output current iout(ma) vin=2v vin=5v vin=9v v out =18v s-8330b30 (lhq4n:100 h) output current ? ripple voltage characteristics (output current increase) ripple voltage vr (mv)

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www.sii-ic.com ? the information described herein is subject to change without notice. ? seiko instruments inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design. ? when the products described herein are regulated produ cts subject to the wassenaar arrangement or other agreements, they may not be exported without authoriz ation from the appropriate governmental authority. ? use of the information described he rein for other purposes and/or repr oduction or copying without the express permission of seiko instrum ents inc. is strictly prohibited. ? the products described herein cannot be used as par t 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 oc cur. 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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