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1/28 xc9260/xc9261 series cot control, 1.5a s y nchronous step-down dc/dc converters general description the xc9260/xc9261 series is a group of synchronous-rectification type dc/dc converters with a built-in p-channel mos driver transistor and n-channel mos switching transistor, designed to allo w the use of ceramic capacitors . output voltage is internall y set in a range from 0.8v to 3.6v (accura cy: 2.0%) increments of 0.05v. the device provides a high efficiency, stable power supply with an output current of 1.5a to be configured using only a coil and two capacitors connected externally. oscillation frequency is set to 1.2mhz or 3.0mhz can be select ed for suiting to your particular application. as for operation mode hisat-cot (*) control excellent in transient response, the xc9260 series is pwm control, the xc9261 series is automatic pwm/pfm switching cont rol, allowing fast response, low ripple and high efficiency over the full range of lo ads (from light load to heavy load). during stand-by, all circuits are shutdown to reduce current consumpti on to as low as 1.0 a or less. as for the soft-start function as fast as 0.3ms in typical for quick turn-on. with the built-i n uvlo (under voltage lock out) function, the internal p-channel mos driver transistor is forced off when input voltage becomes 2.00v or lower. the b types integrate c l high speed discharge function which enables the electric charge at the output capacitor c l to be discharged via the internal discharge. two types of package sot-89-5, usp-6c are available. (*) hisat-cot is an original torex te rm for high speed transient response. a pplications mobile phones bluetooth headsets smart phones, personal digital assistance portable game consoles digital still cameras, camcorders codeless phones point-of-load (pol) typical application circuit etr05042-001 greenoperation-compatible typical performance characteristics features input voltage range : 2.7v 5.5v output voltage range : 0.8v 3.6v ( 2.0%) quiescent current : 25 a (f osc =3.0mhz) output current : 1.5a oscillation frequency : 1.2mhz, 3.0mhz efficiency : 90% (v in =3.7v, v out =1.8v, i out =200ma) control methods : hisat-cot control : 100% duty cycle : pwm control (xc9260) : pwm/pfm auto (xc9261) protection circuits : thermal shutdown : current limit (pendent character) : short circuit protection (type b) functions : soft-start : uvlo : c l high speed discharge (type b) capacitor : ceramic capacitor operating ambient temperature :- 40 + 105 packages : sot-89-5, usp-6c environmentally friendly : eu rohs compliant, pb free 1.5a lx v out v in ce v out v in ce l agnd pgnd c in c l xc9260a18d / xc9261a18d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 l = lqm2mpn1r0mgh( 1.0 h) c in =10 f(grm155r61a106m) c l =10 f(grm155r61a106m) vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v
2/28 xc9260/xc9261 series block diagram (*) the xc9260 offers a fixed pwm control, a control logic of pwm/pfm selector is fixed at ?pwm? internally. the xc9261 control scheme is a fixed pwm/pfm automatic switching, a control logic of pwm/pfm selector is fixed at ?pwm/pfm automatic switching? internally. diodes inside the circuit are an esd protection diode and a parasitic diode. 2) xc9260/xc9261 series type b (usp-6c) 2) xc9260/xc9261 series type b (usp-6c) 1) xc9260/xc9261 series type a (sot-89-5) 2) xc9260/xc9261 series type b (sot-89-5) (*) the xc9260 offers a fixed pwm control, a control logi c of pwm/pfm selector is fixed at ?pwm? internally. the xc9261 control scheme is a fixed pwm/pfm automatic switching, a control logic of pwm/pfm selector is fixed at ?pwm/pfm automatic switching? internally. diodes inside the circuit are an esd protection diode and a parasitic diode.
3/28 xc9260/xc9261 series product classification 1) ordering information xc9260 ????? - pwm control xc9261 ????? - pwm/pfm automatic switching control designator item symbol description a type b refer to selection guide ? output voltage 08 36 output voltage options e.g. 1.2v =1, =2 1.25v =1, =c 0.05v increments : 0.05=a, 0.15=b, 0.25=c, 0.35=d, 0.45=e, 0.55=f, 0.65=h, 0.75=k, 0.85=l, 0.95=m c 1.2mhz oscillation frequency d 3.0mhz pr-g sot-89-5 (1,000/reel) ? - (*1) packages (order unit) er-g usp-6c (3,000/reel) 2) selection guide type output voltage c l auto-discharge short protection (latch) uvlo a fixed no no yes b fixed yes yes yes type chip enable current limit soft-start time thermal shutdown a yes yes fixed yes b yes yes fixed yes (*1) the ?-g? suffix denotes halogen and antimony free as well as being fully rohs compliant.
4/28 xc9260/xc9261 series pin configuration pin assignment pin number sot-89-5 usp-6c pin name functions 1 5 lx switching output 2 - v ss ground 3 3 v out output voltage monitor 4 4 ce chip enable 5 6 v in power input - 2 agnd analog ground - 1 pgnd power ground function ce pin function pin name signal status l stand-by ce h active please do not leave the ce pin open. * the dissipation pad for the usp-6c package should be sol der-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release. if the pad needs to be connected to other pins, it should be connected to the gnd (no. 1 and 2) pin.
5/28 xc9260/xc9261 series absolute maximum ratings ta = 2 5 parameter symbol ratings units input voltage v in -0.3 +6.2 v lx pin voltage v lx -0.3 v in +0.3 or +6.2 (*1) v output voltage v out -0.3 v in +0.3 or +4.0 (*2) v ce input voltage v ce -0.3 +6.2 v lx current i lx - ma 500 sot-89-5 1300 (pcb mounted) (*3) 120 power dissipation usp-6c pd 1000 (pcb mounted) (*3) mw operating ambient temperature topr -40 +105 storage temperature tstg -55 +125 * all voltages are described based on the gnd (agnd and pgnd and v ss ) pin. (*1) the maximum value should be either v in +0.3v or +6.2v in the lowest. (*2) the maximum value should be either v in +0.3v or +4.0v in the lowest. (*3) this is a reference data taken by using the test board. please refer to page 25 and 26 for details.
6/28 xc9260/xc9261 series electrical characteristics xc9260/xc9261 series ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, i out =30ma

v operating voltage range v in - 2.7 - 5.5 v maximum output current i outmax when connected to external components (*1), v in = 1500 - - ma uvlo voltage (*2) v uvlo v out =0.6v,voltage which lx pin holding ?l? level (*6) 1.35 2.0 2.68 v f osc =1.2mhz - 15.0 25.0 quiescent current (xc9261) iq v out =v out(t) 1.1v f osc =3.0mhz - 25.0 40.0 a f osc =1.2mhz - 250 450 quiescent current (xc9260) iq v out =v out(t) 1.1v f osc =3.0mhz - 400 825 a stand-by current i stb v ce =0.0v - 0.0 1.0 a minimum on time t onmin when connected to external components, v in = , i out = 1ma

ns thermal shutdown t tsd - - 150 - thermal shutdown hysteresis t hys - - 30 - lx sw ?h? on resistance r lxh v out =0.6v, i lx =100ma (*3) - 0.14 0.28 ? lx sw ?l? on resistance (*4) r lxl v out =v out(t) v 1.1, i lx =100ma (*3) - 0.10 0.20 ? lx sw ?h? leakage current i leakh v in =5.5v, v ce =0v, v out =0v, v lx =0.0v - 0.0 1.0 a lx sw ?l? leakage current i leakl v in =5.5v, v ce =0v, v out =0v, v lx =5.5v - 0.0 30.0 a current limit (*5) i limh v out =0.6v, i lx until lx pin oscillates 2.5 3.0 4.5 a output voltage temperature characteristics ? v out / (v out ? ? topr) i out =30ma, -40 Q topr Q 105 - 100 - ppm/ ce ?h? voltage v ceh v out =0.6v, applied voltage to v ce , voltage changes lx to ?h? level (*6) 1.40 - v in v ce ?l? voltage v cel v out =0.6v, applied voltage to v ce , voltage changes lx to ?l? level (*6) v ss (*7) - 0.30 v ce ?h? current i ceh v in =5.5v, v ce =5.5v, v out =0.0v -0.1 - 0.1 a ce ?l? current i cel v in =5.5v, v ce =0.0v, v out =0.0v -0.1 - 0.1 a soft-start time t ss v ce =0.0v 5.0v v out =v out(t) v 0.9 after "h" is fed to ce, the time by when clocks are generated at lx pin. 0.10 0.30 0.50 ms short protection threshold voltage (type b) v short sweeping v out , v out voltage which lx becomes ?l? level (*6) 0.17 0.27 0.37 v c l discharge (type b) r dchg v ce =0v, v out =4.0v 50 210 300 ? unless otherwise stated, v in =5v, v ce =5v, v out(t) =nominal value, note: (*1) when the difference between the input and the output is small, 1 00% duty might come up and inte rnal control circuits keep p-ch driver turning on even though the output current is not so large. if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance. (*2) including uvlo detect voltage, hysteresis operating voltage range for uvlo release voltage. (*3) r lxh = (v in - lx pin measurement voltage) / 100ma, r lxl = lx pin measurement voltage / 100ma (*4) design value for the xc9261 series. (*5) current limit denotes the level of detection at peak of coil current. (*6) "h"=v in ~ v in - 1.2v, "l"=- 0.1v ~ + 0.1v (*7) agnd in the case of usp-6c.
7/28 xc9260/xc9261 series electrical characteristics (continued) spec table t onmin v out f osc = 1.2mhz f osc = 3.0mhz nominal output voltage

v out(t) min. typ. max. v in min. typ. max. min. typ. max. 0.80 0.784 0.800 0.816 2.70 173 247 321 71 119 166 0.85 0.833 0.850 0.867 2.70 184 262 341 72 121 169 0.90 0.882 0.900 0.918 2.70 194 278 361 73 122 171 0.95 0.931 0.950 0.969 2.70 205 293 381 74 123 172 1.00 0.980 1.000 1.020 2.70 216 309 401 86 123 160 1.05 1.029 1.050 1.071 2.70 227 324 421 91 130 169 1.10 1.078 1.100 1.122 2.70 238 340 441 95 136 177 1.15 1.127 1.150 1.173 2.70 248 355 461 99 142 185 1.20 1.176 1.200 1.224 2.70 259 370 481 104 148 193 1.25 1.225 1.250 1.275 2.70 270 386 502 108 154 201 1.30 1.274 1.300 1.326 2.70 281 401 522 112 160 209 1.35 1.323 1.350 1.377 2.70 292 417 542 117 167 217 1.40 1.372 1.400 1.428 2.70 302 432 562 121 173 225 1.45 1.421 1.450 1.479 2.70 313 448 582 125 179 233 1.50 1.470 1.500 1.530 2.70 324 463 602 130 185 241 1.55 1.519 1.550 1.581 2.70 335 478 622 134 191 249 1.60 1.568 1.600 1.632 2.70 346 494 642 138 198 257 1.65 1.617 1.650 1.683 2.75 350 500 650 140 200 260 1.70 1.666 1.700 1.734 2.83 350 500 650 140 200 260 1.75 1.715 1.750 1.785 2.92 350 500 650 140 200 260 1.80 1.764 1.800 1.836 3.00 350 500 650 140 200 260 1.85 1.813 1.850 1.887 3.08 350 500 650 140 200 260 1.90 1.862 1.900 1.938 3.17 350 500 650 140 200 260 1.95 1.911 1.950 1.989 3.25 350 500 650 140 200 260 2.00 1.960 2.000 2.040 3.33 350 500 650 140 200 260 2.05 2.009 2.050 2.091 3.42 350 500 650 140 200 260 2.10 2.058 2.100 2.142 3.50 350 500 650 140 200 260 2.15 2.107 2.150 2.193 3.58 350 500 650 140 200 260 2.20 2.156 2.200 2.244 3.67 350 500 650 140 200 260 2.25 2.205 2.250 2.295 3.75 350 500 650 140 200 260 2.30 2.254 2.300 2.346 3.83 350 500 650 140 200 260 2.35 2.303 2.350 2.397 3.92 350 500 650 140 200 260 2.40 2.352 2.400 2.448 4.00 350 500 650 140 200 260 2.45 2.401 2.450 2.499 4.08 350 500 650 140 200 260 2.50 2.450 2.500 2.550 4.17 350 500 650 140 200 260 2.55 2.499 2.550 2.601 4.25 350 500 650 140 200 260 2.60 2.548 2.600 2.652 4.33 350 500 650 140 200 260 2.65 2.597 2.650 2.703 4.42 350 500 650 140 200 260 2.70 2.646 2.700 2.754 4.50 350 500 650 140 200 260
8/28 xc9260/xc9261 series electrical characteristics (continued) spec table t onmin v out f osc =1.2mhz f osc =3.0mhz nominal output voltage

v out(t) min. typ. max. v in min. typ. max. min. typ. max. 2.75 2.695 2.750 2.805 4.58 350 500 650 140 200 260 2.80 2.744 2.800 2.856 4.67 350 500 650 140 200 260 2.85 2.793 2.850 2.907 4.75 350 500 650 140 200 260 2.90 2.842 2.900 2.958 4.83 350 500 650 140 200 260 2.95 2.891 2.950 3.009 4.92 350 500 650 140 200 260 3.00 2.940 3.000 3.060 5.00 350 500 650 140 200 260 3.05 2.989 3.050 3.111 5.08 350 500 650 140 200 260 3.10 3.038 3.100 3.162 5.17 350 500 650 140 200 260 3.15 3.087 3.150 3.213 5.25 350 500 650 140 200 260 3.20 3.136 3.200 3.264 5.33 350 500 650 140 200 260 3.25 3.185 3.250 3.315 5.42 350 500 650 140 200 260 3.30 3.234 3.300 3.366 5.50 350 500 650 140 200 260 3.35 3.283 3.350 3.417 5.50 355 508 660 142 203 264 3.40 3.332 3.400 3.468 5.50 361 515 670 144 206 268 3.45 3.381 3.450 3.519 5.50 366 523 680 146 209 272 3.50 3.430 3.500 3.570 5.50 371 530 689 148 212 276 3.55 3.479 3.550 3.621 5.50 377 538 699 151 215 280 3.60 3.528 3.600 3.672 5.50 382 545 709 153 218 284
9/28 xc9260/xc9261 series test circuits (*1) < circuit no. > < circuit no. > < circuit no. > < circuit no. > a 1f v < circuit no. > < circuit no. > i ceh i cel a a 1uf rpulldown 200 wave form measure point v i limh a v r l c l l c in wave form measure point 1f 1f 1f 1f wave form measure point r lxh = (v in -v lx )/i lx r lxl = v lx /i lx i lx v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd v in l x agnd ce v out pgnd a i leakh i leakl < circuit no. > b type external components f osc = 1.2mhz l : 4.7 h(ltf5022t-4r7n2r0-lc) c in : 10 f(ceramic) c l : 10 f(ceramic) external components f osc = 3.0mhz l : 1.0 h(lqm2mpn1r0mgh) c in : 10 f(ceramic) c l : 10 f(ceramic) (*1) in the case of sot-89-5, agnd and pgnd are treated as v ss .
10/28 xc9260/xc9261 series typical application circuit * in the case of sot-89-5, agnd and pgnd are treated as v ss . typical examples f osc =1.2mhz manufacturer product number value murata lqh5bpn4r7nt0l 4.7 h tdk ltf5022t-4r7n2r0-lc 4.7 h l coilcraft xfl4020-472mec 4.7 h typical examples f osc =3.0mhz manufacturer product number value murata lqm2mpn1r0mgh 1.0 h taiyo yuden makk2016t1r0m 1.0 h l tdk mlp2520k1r0m 1.0 h typical examples (*1) f osc =1.2mhz, f osc =3.0mhz manufacturer product number value murata grm155r61a106m 10 f/10v murata grm21br71a106ke51 10 f/10v c in taiyo yuden lmk212ab7106mg 10 f/10v murata grm155r61a106m 10 f/10v (*2) murata grm21br71a106ke51 10 f/10v (*2) c l taiyo yuden lmk212ab7106mg 10 f/10v (*2) (*1) select components appropriate to the usage conditions (ambient temperature, input & output voltage). (*2) c l =20 f or more if v in - v out(t) < 1.5 ? the relationship between output voltage, input voltage, and c l value 2.5 2.8 3.1 3.4 3.7 4.0 4.3 4.6 4.9 5.2 5.5 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 output voltage (v) input voltage (v) external components c l = 10f external components c l = 20for more
11/28 xc9260/xc9261 series operational explanation the xc9260/xc9261 series consists of a reference voltage sour ce, error amplifier, comparator, phase compensation, minimum on time generation circuit, output voltage adjustment resistors, p-channel mos driv er transistor, n-channel mos switching transistor for the synchronous switch, current limiter circuit, uvlo circuit, thermal shutdown circuit, short protection circui t, pwm/pfm selection circuit and others. (see the block diagram below.) block diagram xc9260/xc9261 series type b (sot-89-5) the method is hisat-cot (high speed circuit architecture for tr ansient with constant on time ) control, which features on time control method and a fast transient response that also achieves low output voltage ripple. the on time (t on ) is determined by the input voltag e and output voltage, and turns on the pch mos driver tr. for a fixed time. during the off time (t off ), the voltage that is fed back through r1 and r2 is compared to the reference voltage by the error amp, and the error amp output is phase compensated and sent to the comparator. the comparator compares this signal to the reference voltage, and if the signal is lower than the reference volt age, sets the sr latch. on time then resumes. by doing thi s, pwm operation takes place with the off time controlled to the optimum duty ratio and the output voltage is stabilized. the phas e compensation circuit optimizes the frequency characteristics of t he error amp, and generates a ramp wave similar to the ripple voltage that occurs in the output to modu late the output signal of t he error amp. this enables a stable feedback system to be obtained even when a low esr capacitor such as a ceramic capacitor is used, and a fast transient response and stabilization of the output voltage are achieved. generates an on time that depends on the input voltage and output voltage (t on ). the on time is set as given by the equations below. f osc P 1.2mhz type t on (ns) = v out /v in 833 f osc P 3.0mhz type t on (ns) = v out /v in 333 the switching frequency can be obtained from the on time (t on ), which is determined by the input voltage and output voltage, and the pwm controlled off time (t off ) as given by the equation below. f osc (mhz) = v out (v) / (v in (v) t on (ns)) <100% duty cycle mode> when the load current is heavy and the voltage difference between input voltage and output voltage is small, 100% duty cycle mode is activated and it keeps the pch mos driver tr. keep on. 100% duty cycle mode attains a high output voltage stability and a high-speed response under all load conditions, from light to heavy, even in conditions where the dropout voltage is low. the error amp monitors the output voltage. the voltage divided by the internal r1 and r2 resistors is a feedback voltage for error amp. and compared to the referenc e voltage. the output voltage of the e rror amp becomes higher when the feedback voltage is higher than the reference vo ltage. the frequency characteristics of t he error amp are optimized internally.
12/28 xc9260/xc9261 series operational explanation (continued) the reference voltage forms a reference that is used to stabilize the output voltage of the ic. after ?h? level is fed to ce pin, the reference voltage connect ed to the error amp increases linearly during the soft start int erval. this allows the voltage divided by the internal r1 and r2 resistors and the reference voltage to be controlled in a balanced manner, and the output voltage rises in proportion to the rise in the reference voltage. this operation prevents rush input cur rent and enables the output voltage to rise smoothly. if the output voltage does not reach the set output voltage within the soft start time, such as when the load is heavy or a lar ge capacity output capacitor is connected, the balancing of the voltage divided by the internal resistors r1 and r2 and the reference voltage is lost, however, the current restriction func tion activates to prevent an ex cessive increase of input curren t, enabling a smooth rise of the output voltage. regarding xc9260 which has pwm control method, it works wi th a continuous conduction mode, and operates at a stable switching frequency by means of an on time (t on ) that is determined by the input voltage and output voltage regardless of the load. regarding xc9261 which has pwm/pfm auto switching control me thod, it works with a discontinuous conduction mode at light loads, and lowers the switching frequency to reduce switching loss and improve efficiency. operation starts when ?h? voltage is input in to the ce pin. the ic can be put in t he shutdown state by inputting ?l? voltage in to the ce pin. in the shutdown state, the supply current of the ic is 0 a (typ.), and the pch mos driver tr. and nch mos switch tr. for synchronous rectification turn off. the ce pin is a cmos input and the sink current is 0 a. when the v in voltage becomes 2.00v (typ.) or lower, the p-ch mos driver tr ansistor output driver transistor is forced off to prevent false pulse output caused by unstable oper ation of the internal circuitry. when the v in pin voltage becomes 2.10v (typ.) or higher, switching operation takes place. by releasi ng the uvlo function, the ic per forms the soft start function to initiate output startup oper ation. the uvlo circuit does not cause a complete shutdown of the ic,but c auses pulse output to be suspended; therefore, the internal circuitry remains in operation . for protection against heat damage of the ics, thermal shutdown function moni tors chip temperature. the thermal shutdown circuit starts operating and the p-ch mos driver and n-ch mos driver trans istor will be turned off when the chip s temperature reaches 150 . when the temperature drops to 120 or less after shutting of the current flow, the ic performs the soft-start function to initiate output startup operation. the b type short-circuit protection circuit protects the device that is connected to this product and to the input/output in situations such as when the out put is accidentally shorted to gnd. the shor t-circuit protection circuit monitors the output voltage, and when the output voltage falls below the short-circuit protection threshold voltage, it turns off the pch mos drive r tr and latches it. once in the latched state, operation is resumed by turning off the ic from the ce pin and then restarting, or b y re-input into the v in pin. the b type can quickly discharge the electric charge at the output capacitor (c l ) when a low signal to the ce pin which enables a whole ic circuit put into off state, is inputt ed via the n-ch mos switch transistor located between the v out pin and the gnd pin. when the ic is disabled, electric charge at the output capacitor (c l ) is quickly discharged so that it may avoid application malfunction. v=v out(t) e ? t / t= ln (v out(t) / v) v: output voltage after discharge v out(t) : output voltage t: discharge time : c l r dchg c l : capacitance of output capacitor r dchg : c l auto-discharge resistance, but it depends on supply voltage. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2 4 6 8 1012 1416 1820 discharge time: t(ms) output voltage: v out (v) - -- --- output voltage dischage characteristics r dchg = 210 (typ) c l =10 f v out = 1.2v v out = 1.8v v out = 3.3v
13/28 xc9260/xc9261 series operational explanation (continued) the current limiter circuit of the xc9260/xc9261 series monitors the current fl owing through the p-channe l mos driver transisto r connected to the lx pin. when the driver current is greater than a specific level, t he current limit function operates to turn off the pulses from the lx pin at any given timing. when the over curr ent state is eliminated, the ic resumes its normal operation. note on use 1. for the phenomenon of temporal and tr ansitional voltage decrease or voltage increase, the ic may be damaged or deteriorated if ic is used beyond t he absolute max. specifications. 2. spike noise and ripple voltage arise in a switching regulato r as with a dc/dc converter. t hese are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout of external components. once the design has been completed, verification with actual components should be done. 3. the dc/dc converter characteristi cs depend greatly on the externally connected components as well as on the characteristics of this ic, so refer to the specifications and standard circuit ex amples of each component when carefully considering which components to select. be especially careful of the capacitor characteristics and use b characteristics (jis standard) or x7r, x5r (eia standard) ceramic capacitors. 4. make sure that the pcb gnd traces are as thick and wide as possible. the v ss pin or pgnd pin and agnd pin fluctuation caused by high ground current at the time of switching may result in instability of t he ic. therefore, the gnd traces close to the v ss pin, pgnd pin and agnd pin are important. 5. mount external components as close as possible to the ic. keep the wiring short and thick to lower the wiring impedance. 6. a feature of hisat-cot contro l is that it controls the off time in order to control the dut y, which varies due to the effect s of power loss. in addition, changes in the on time due to 100% dut y cycle mode are allowed. for this reason, caution must be exercised as the characteristi cs of the switching frequency will vary dependi ng on the external component characteristics, board layout, input voltage, output voltag e, load current and other parameters. 7. due to propagation delay inside the product, the on time gener ated by the minimum on time generation circuit is not the same as the on time that is the ratio of the input voltage to the output voltage. 8. with regard to the current limiting val ue, the actual coil current may at times exceed the electrical characteristics due to propagation delay inside the product. 9. the ce pin is a cmos input pin. do not use with the pin o pen. if connecting to the input or ground, use the resistor not mor e than 1m ? or less. to prevent malfunctioning of the device connected to this product or the input/output due to short circuiting between pins, it is recommended t hat a resistor be connected. 10. in the b type, if the outpu t voltage drops below the short circuit protection threshold voltage at the end of the soft star t interval, operation will stop. 11. regarding xc9261 which has pwm/pfm aut o switching control method, it works with a discontinuous conduction mode at light loads, and in this case where the voltage difference between input voltage and output voltage is low or the coil inductance is higher than the value indicated in the standard circ uit example, the coil current may reverse when the load is light, and thus pulse skipping will not be possible and light load efficiency will worsen. 12. when the voltage difference between input voltage and output voltage is low, the load stability feature may deteriorate. 13. torex places an importance on improving our products and th eir reliability.we request that users incorporate fail-safe designs and post-aging protecti on treatment when using torex products in their systems.
14/28 xc9260/xc9261 series note on use (continued) 14. instructions of pattern layouts the operation may become unstable due to noise and/or phase lag from the output curr ent when the wire impedance is high, please place the input capacitor(c in ) and the output capacitor (c l ) as close to the ic as possible. (1) in order to stabilize v in voltage level, we recommend that a by-pass capacitor (c in ) be connected as close as possible to the v in pin, pgnd pin and agnd pin. (2) please mount each external component as close to the ic as possible. (3) wire external components as close to the ic as possible and use thick, short connecting traces to reduce the circuit impedance. (4) make sure that the gnd traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of switching may result in instability of the ic. (5) this series? internal driver transistors bring on heat bec ause of the output current and on resistance of p-channel and n-channel mos driver transistors. please consi der the countermeasures against heat if necessary. sot-89-5 pcb mounted 1st layer 2nd layer usp-6c pcb mounted 1st layer 2nd layer
15/28 xc9260/xc9261 series typical performance characteristics (1) efficiency vs. output current xc9260a10d / xc9261a10d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 xc9260a10c / xc9261a10c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) xc9260a18c / xc9261a18c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: iout (ma) efficiency: effi (% ) xc9261 xc9260 vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) xc9260a18d / xc9261a18d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) vin = 5.0v vin = 3.7v vin = 5.0v vin = 3.7v xc9260a33d / xc9261a33d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 xc9260a33c / xc9261a33c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) efficiency: effi (% ) xc9261 xc9260 v in = 5.0v v in = 5.0v l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m)
16/28 xc9260/xc9261 series typical performance characteristics (continued) (2) output voltage vs. output current xc9261a18d 1.60 1.70 1.80 1.90 2.00 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) xc9261a33d 3.00 3.10 3.20 3.30 3.40 3.50 3.60 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) v in = 5.0v v in = 3.7v l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = lqm2mpn1r0mgh( 1. 0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) (3) ripple voltage vs. output current xc9260a18d / xc9261a18d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) ripple voltage: vr(mv) xc9261 xc9260 xc9260a33d / xc9261a33d 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) ripple voltage: vr(mv) xc9261 xc9260 v in = 3.7v l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = lqm2mpn1r0mgh( 1. 0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v xc9260a18c / xc9261a18c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) ripple voltage: vr(mv) xc9261 xc9260 xc9260a33c / xc9261a33c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 10000 output current: i out (ma) ripple voltage: vr(mv) xc9261 xc9260 v in = 5.0v v in = 3.7v l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m)
17/28 xc9260/xc9261 series typical performance characteristics (continued) (4) fb voltage vs. ambient temperature (5) uvlo voltage vs. ambient temperature xc9261b18d 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) feedback voltage: vfb (v) v in = 3.7v xc9260a08d 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) uvlo voltage: uvlo (v) (6) quiescent current vs. ambient temperature xc9261a08d 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) quiescent current: iq ( a) xc9261a08c 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) quiescent current: iq ( a) v in = 5.0v, 3.7v, 2.7v v in = 5.0v, 3.7v, 2.7v xc9260a08d 0 100 200 300 400 500 600 700 800 900 1000 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) quiescent current: iq ( a) xc9260a08c 0 100 200 300 400 500 600 700 800 900 1000 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) quiescent current: iq ( a) v in = 5.0v v in = 3.7v v in = 2.7v v in = 5.0v v in = 3.7v v in = 2.7v
18/28 xc9260/xc9261 series typical performance characteristics (continued) (7) stand-by current vs. ambient temperature (8) oscillation frequency vs. ambient temperature xc9260a08d 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation freqency: f os c (khz) xc9261a08d 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) standby current: istb ( a) v in = 5.0v v in = 3.6v v in = 3.0v v in = 5.0v v in = 3.7v, 2.7v l = lqm2mpn1r0mgh(1.0h) c in = 10f(grm155r61a106m) c l = 10f(grm155r61a106m) xc9260a18d 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation freqency: f os c (khz) xc9260a33d 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation fre qency: f os c (khz) v in = 5.0v, 5.5v v in = 4.2v v in = 5.0v, 3.6v l = lqm2mpn1r0mgh(1.0h) c in = 10f(grm155r61a106m) c l = 10f(grm155r61a106m) l = lqm2mpn1r0mgh(1.0h) c in = 10f(grm155r61a106m) c l = 10f(grm155r61a106m) v in = 3.0v xc9260a08c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation freqency: f os c (khz) xc9260a18c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation freqency: f os c (khz) v in = 5.0v v in = 3.6v v in = 3.0v l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v, 3.6v v in = 3.0v
19/28 xc9260/xc9261 series typical performance characteristics (continued) (8) oscillation frequency vs. ambient temperature (continued) (9) pch driver on resistance vs. ambient temperature xc9260a08d 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) lx sw pch on resistance: r lxh (m ) xc9260a33c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 500.0 1000.0 1500.0 2000.0 output current: i out (ma) oscillation freqency: f os c (khz) v in = 5.0v v in = 3.7v v in = 2.7v v in = 5.0v, 5.5v v in = 4.2v l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) (10) nch driver on resistance vs. ambient temperature (11) lxsw ?h? leakage current vs. ambient temperature xc9260a08d 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 -50 -25 0 25 50 75 100 125 ambient temperature : ta ( ) lxsw?h? leakage current: i leakh ( a) xc9260a08d 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) lx sw nch on resistance: r lxl (m ) v in = 5.0v v in = 3.7v v in = 2.7v v in = 5.5v (12) lxsw ?l? leakage current vs. ambient temperature (13) ce ?h? voltage vs. ambient temperature xc9261a08d 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) ce?h? voltage v ceh (v) xc9260a08d 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 -50 -25 0 25 50 75 100 125 ambient temperature : ta ( ) lxsw?h? leakage current: i leakl ( a) v in = 5.5v v in = 5.0v v in = 3.7v v in = 2.7v
20/28 xc9260/xc9261 series typical performance characteristics (continued) (14) ce?l? voltage vs. ambient temperature (15) soft-start time vs. ambient temperature xc9261b08d 0 50 100 150 200 250 300 350 400 450 500 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) soft-start time: t ss ( u s) xc9261a08d 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) ce?l? voltage v cel (v) v in = 5.0v v in = 3.7v v in = 2.7v v in = 5.0v (16) current limit vs. ambient temperature (17) cl discharge resistance vs. ambient temperature xc9261b08d 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) cl discharge resistance: r dchg ( ) xc9261a08d 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 -50 -25 0 25 50 75 100 125 ambient temperature : ta ( ) current limit: i limh (ma) v in = 5.0v v in = 5.0v v in = 3.7v v in = 2.7v (18) short protection threshold vs. ambient temperature xc9261b08d 0 100 200 300 400 500 -50 -25 0 25 50 75 100 125 ambient temperature: ta ( ) short protection threshold v short (mv) v in = 5.0v, 3.7v, 2.7v
21/28 xc9260/xc9261 series typical performance characteristics (continued) (19) load transient response v in = 5.0v v out = 1.8v f os c = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 1.8v f osc = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 3.3v f os c = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 3.3v f osc = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) i out : 1.0a v out : 50mv/div v out : 50mv/div 50 s/div 50 s/div v out : 50mv/div 50 s/div v out : 50mv/div 50 s/div i out : 10m a i out : 1.0a i out : 10m a i out : 1.0a i out : 10m a i out : 1.0a i out : 10ma xc9260a18d xc9261a18d xc9260a33d xc9261a33d v in = 5.0v v out = 1.2v f os c = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 1.2v f osc = 3.0mh i out = 10ma ? 1.0a l = lqm2mpn1r0mgh( 1.0 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) i out : 1.0a v out : 50mv/div v out : 50mv/div 50 s/div 50 s/div i out : 10m a i out : 1.0a i out : 10m a xc9260a12d xc9261a12d
22/28 xc9260/xc9261 series typical performance characteristics (continued) (19) load transient response (continued) v in = 5.0v v out = 1.8v f osc = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 1.8v f os c = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 3.3v f osc = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 3.3v f os c = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v out : 100mv/div 50 s/div v out : 100mv/div 50 s/div v out : 200mv/div 50 s/div v out : 200mv/div 50 s/div i out : 1.0a i out : 10ma i out : 1.0a i out : 10ma i out : 1.0a i out : 10ma i out : 1.0a i out : 10ma xc9260a18c xc9261a18c xc9260a33c xc9261a33c v in = 5.0v v out = 1.2v f osc = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v in = 5.0v v out = 1.2v f os c = 1.2mh i out = 10ma ? 1.0a l = ltf5022t-4r7n2r0-lc(4.7 h) c in = 10 f(grm155r61a106m) c l = 10 f(grm155r61a106m) v out : 100mv/div 50 s/div v out : 100mv/div 50 s/div i out : 1.0a i out : 10ma i out : 1.0a i out : 10ma xc9260a12c xc9261a12c
23/28 xc9260/xc9261 series packaging information usp-6c (unit:mm) sot-89-5 (unit:mm) 1.80.05 (0.50) (0.1) 1.40.05 0.200.05 0.300.05 0.100.05 1pin indent 0.05 1.0 1.6 +0.15 -0.2 4.50.1 0.420.06 0.420.06 0.470.06 1.50.1 1.50.1 0.4 +0.03 -0.02 0.4 +0.03 -0.02 123 4 5 0.420.06 0.420.06 0.420.06 2 1.6) 1.7)
24/28 xc9260/xc9261 series packaging information (continued) usp-6c reference pattern layout (unit: mm) usp-6c reference metal mask design (unit: mm)
25/28 xc9260/xc9261 series packaging information (continued) sot-89-5 power dissipation power dissipation data for the sot-89-5 is shown in this page. the value of power dissipation varies with the mount board conditions. please use this data as the reference data taken in the following condition. 1. measurement condition condition: mount on a board ambient: natural convection soldering: lead (pb) free board: dimensions 40 x 40 mm (1600 mm 2 in one side) copper (cu) traces occupy 50% of the board area in top and back faces package heat-sink is tied to the copper traces material: glass epoxy (fr-4) thickness: 1.6mm through-hole 5 x 0.8 diameter 2. power dissipation vs. ambient temperature (105 ) board mount (tjmax=125 ) ambient temperature ( ) power dissipation pd (mw) thermal resistance ( /w) 25 1300 105 260 76.92 pd-ta? 0 200 400 600 800 1000 1200 1400 25 45 65 85 105 125 ??ta S?p?pdmw 28.9 40.0 2.5 evaluation board (unit: mm) pd vs. ta ambient temperature: ta ( ) p ower di ss i pat i on: pd ( m w)
26/28 xc9260/xc9261 series packaging information (continued) usp-6c power dissipation power dissipation data for the usp-6c is shown in this page. the value of power dissipation varies with the mount board conditions. please use this data as the reference data taken in the following condition. 1. measurement condition condition: mount on a board ambient: natural convection soldering: lead (pb) free board: dimensions 40 x 40 mm (1600 mm 2 in one side) copper (cu) traces occupy 50% of the board area in top and back faces package heat-sink is tied to the copper traces material: glass epoxy (fr-4) thickness: 1.6mm through-hole 4 x 0.8 diameter 2. power dissipation vs. ambient temperature (105 ) board mount (tjmax=125 ) ambient temperature ( ) power dissipation pd (mw) thermal resistance ( /w) 25 1000 105 200 100.00 pd-ta? 0 200 400 600 800 1000 1200 25 45 65 85 105 125 ??ta S?p?pdmw evaluation board (unit: mm) pd vs. ta ambient temperature: ta ( ) p ower di ss i pat i on: pd ( m w)
27/28 xc9260/xc9261 series marking rule ? represents production lot number 01 09, 0a 0z, 11 9z, a1 a9, aa az, b1 zz in order. (g, i, j, o, q, w excluded) * no character inversion used. represents products series mark product series a xc9260a*****-g, xc9261a*****-g b xc9260b*****-g, xc9261b*****-g represents integer and oscillation frequency of the output voltage mark xc9260 series xc9261 series v out (v) f osc =1.2mlhz f osc =3.0mlhz f osc =1.2mlhz f osc =3.0mlhz 0.x a e n u 1.x b f p v 2.x c l r x 3.x d m t y represents decimal number of the output voltage v out (v) mark v out (v) mark x.00 0 x.05 a x.10 1 x.15 b x.20 2 x.25 c x.30 3 x.35 d x.40 4 x.45 e x.50 5 x.55 f x.60 6 x.65 h x.70 7 x.75 k x.80 8 x.85 l x.90 9 x.95 m 1 2 3 6 5 4 usp-6c sot89-5 524 123
28/28 xc9260/xc9261 series 1. the products and product specifications cont ained herein are subject to change without notice to improve performance characteristic s. consult us, or our representatives before use, to confirm that the informat ion in this datasheet is up to date. 2. we assume no responsibility for any infri ngement of patents, pat ent rights, or other rights arising from the use of any information and circuitry in this datasheet. 3. please ensure suitable shipping controls (including fail-safe designs and aging protection) are in force for equipment employing products listed in this datasheet. 4. the products in this datasheet are not devel oped, designed, or approved for use with such equipment whose failure of malfuncti on can be reasonably expected to directly endanger the life of, or cause significant injury to, the user. (e.g. atomic energy; aerospace; transpor t; combustion and associated safety equipment thereof.) 5. please use the products listed in this datasheet within the specified ranges. should you wish to use the products under conditions exceeding the specifications, please consult us or our representatives. 6. we assume no responsibility for damage or loss due to abnormal use. 7. all rights reserved. no part of this dat asheet may be copied or reproduced without the prior permission of torex semiconductor ltd.

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