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1/29 xc9242/xc9243 series 2a synchronous step-down dc/dc converters xc9242b08c 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 (%) l=4.7h(slf7055),c in1 =20f(lmk212abj106kgx2 ) c in2 =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2 ) r fb1 =47k, r fb2 =15k, c fb =330p f v in =5.0v ???????????????? ???????????????????? typical application circuit applications ? ? mobile phones ? ? bluetooth headsets ? ? personal digital assistance ? ? portable game consoles ? ? digital still cameras, camcorders driver transistor : 0.11 ? p-ch driver transistor 0.12 ? n-ch switching transistor input voltage range : 2.7v 6.0v output voltage setting : 0.9v v in fb voltage : 0.8v2.0% high efficiency : 95%(typ.)* output current : 2.0a oscillation frequency : 1.2mhz15%, 2.4mhz 15% maximum duty cycle : 100% functions : soft-start circuit built-in c l discharge current limit circuit automatic return thermal shutdown uvlo output capacitor : low esr ceramic capacitor control methods : pwm control (xc9242) pwm/pfm auto (xc9243) operating ambient temperature : -40 ~ +85 packages : usp-10b, sop-8fd environmentally friendly : eu rohs compliant, pb free * performance depends on external components and wiring on the pcb. ? greeno p eration ? com p atible general description the xc9242/xc9243 series is a group of synchronous-recti fication step-down dc/dc converters with a built-in 0.11
(typ.) p-channel mos driver transistor and 0.12
(typ.) n-channel mos switching transistor, designed to allow the use of ceramic capacitors. the small on-resistances of these two inte rnal driver transistors enable a high efficiency, stable power supply with an output current up to 2a. the xc9242/xc9243 series has operating voltage r ange of 2.7v~6.0v and a 0.8v (2.0%) reference voltage, and using externally connected resist ors, the output voltage can be set freely from 0.9v. with an internal switching frequency of 1.2mhz or 2. 4mhz, small external components can be used. the xc9242 series is pwm control, and the xc9243 series is pwm/pfm, which automatically switches from pwm to pfm during light loads and provides high efficiency, high load response, low voltage ripple, can be achieved over a wide range of load conditions. the series have a high speed soft-start as fast as 1ms in typical for quick turn-on. it?s suitable for large-current application due to limit current is configured 4.0a in typical. during stand-by, all circuits are shutdown to reduce current consumpti on to as low as 1.0 a or less. the integrated c l discharge function which enables the electric charge at the output capacitor c l to be discharged via the internal discharge switch located between the l x and v ss pins. due to c l discharge function, malfunction on l x is prevented when stand-by mode. with the built-in uvlo (under voltage lock out) function, the internal p-channel driver transistor is forced off when i nput voltage becomes 2.5v or lower. the series are available in usp-10b, sop-8fd packages. etr0521-010 features ? xc9242/xc9243 series (fb type) ? efficiency vs. output current (fosc=1.2mhz, v out =3.3v) typical performance characteristics
2/29 xc9242/xc9243 series block diagram xc9242/xc9243 series * diodes inside the circuits are esd protection diodes and parasitic diodes. ? product classification ? ordering information xc9242 ????? - (*1) fixed pwm control xc9243 ????? - (*1) pwm / pfm automatic switching control designator item symbol description functional selection b c l discharge ? output voltage 08 reference voltage is fixed at 0.8v c 1.2mhz oscillation frequency d 2.4mhz dr-g usp-10b (3,000/reel) (*2) ? - (*1) package (order unit) qr-g sop-8fd (1,000/reel) selection guide type soft-start time chip enable current limiter thermal shutdown uvlo c l auto- discharge b fixed yes yes yes yes yes (*1) the ?-g? suffix denotes halogen and antimony free as well as being fully rohs compliant. (*2) the usp-10b reels are shipped in a moisture-proof packing.
3/29 xc9242/xc9243 series pin configuration ? pin assignment pin number usp-10b sop-8fd pin name functions 1,10 1,8 lx switching output 2,3 2 pgnd power ground 4 3 fb output voltage monitor 5 4 agnd analog ground 6 5 ce chip enable 7 6 avin analog input 8,9 7 pvin power input ? ce pin function pin name signal status h active ce l stand-by * please do not leave the ce pin open. usp-10b * please connect the power input pi ns (no.8 and no.9) and analog input pin (no.7) when operating. * please connect the two lx pins (no.1 and 10). * please connect the power ground pins (no.2 and 3) and analog ground pin (no.5) when operating. * it is recommended that the heat dissipation pad of t he usp-10b package is soldered by using the reference mount pattern and metal mask pattern for mounting strength. the mount pattern should be electrically opened or connected to agnd pin (no.5) and pgnd pin (no.2, and 3). lx ce sop-8fd (top view) 1 2 3 4 8 7 6 5 pvin avin lx agnd pgnd fb sop-8fd (top view) sop-8fd * please connect the power input pin (no.7) and analog input pin (no.6) when operating. * please connect the two lx pins (no.1 and 8). * please connect the two power ground pins (no.2 and 4). * it is recommended that the heat dissipation pad of the sop-8fd package is soldered by using the reference mount pattern and metal mask pattern for mounting strength. the mount pattern should be electrically opened or connected to agnd pin (no.6) and pgnd pin (no.7). usp-10b (bottom view)
4/29 xc9242/xc9243 series ? absolute maximum ratings ???? ?????????????????? ta=25 ? ??? all voltages are described based on the gr ound voltage of agnd and pgnd. (*1) please connect pvin pi n and avin pin for use. (*2) the maximum value should be either +7.0 or v pvin +0.3 in the lowest. (*3) it is measured when the two lx pins (usp-10b no.1 and 10, sop-8fd no.1 and 8) are tied up to each other. parameter symbol ratings unit pvin pin voltage v pvin avin pin voltage v avin -0.3 ~ +7.0 (*1) v ce pin voltage v ce -0.3 ~ +7.0 v fb pin voltage v fb -0.3 ~ +7.0 v lx pin voltage v lx -0.3 ~ +7.0 or v pvin +0.3 (*2) v lx pin current i lx 6.0 (*3) a usp-10b pd 150 mw power dissipation sop-8fd pd 300 mw operating ambient temper ature topr -40 ~ +85 storage temperature t stg -55 ~ +125
5/29 xc9242/xc9243 series ? electrical characteristics xc9242/xc9243, f osc =1.2mhz, ta=25 parameter symbol conditions min typ. max. unit circuit fb voltage v fb v in = 5.0v, v ce =5.0v voltage to start oscillation while v fb =0.72v 0.88v 0.784 0.800 0.816 v operating voltage range v in when connected to external components 2.7 - 6.0 v maximum output current i outmax v in =v ce =5.0v (*1,*2) when connected to external components 2.0 - - a uvlo voltage v uvlo v ce =5.0v, v fb =0.72v voltage which lx pin holding ?l? level (*3) 2.00 - 2.68 v quiescent current i q v in =v ce =5.0v, v fb =0.88v - 41 78 a stand-by current i stb v in =5.0v, v ce =0v, v fb =0.88v - 0.01 1.00 a oscillation frequency f osc v in =v ce =5.0v, i out =300ma when connected to external components 1020 1200 1380 khz pfm switch current (*4) i pfm v in =v ce =4.0v, i out =1ma when connected to external components - 280 - ma pfm duty limit (*4) dty limit_pfm v in =v ce =2.7v, i out =1ma when connected to external components - 180 250 % maximum duty limit d max v in =v ce =5.0v, v fb =0.72v 100 - - % minimum duty limit d min v in =v ce =5.0v, v fb =0.88v - - 0 % efficiency effi v in =v ce =5.0v, i out =500ma (*5) r fb1 =47k ? , r fb2 =15k ? , c fb =330pf - 95 - % lxsw?h?on resistance r lxh v in =v ce =4.0v, v fb =0.72v (*6) - 0.11 0.21 lxsw?l?on resistance r lxl - 0.12 0.30 (*7) - lxsw?h? leakage current i leakh v in =5.0v, v ce =0v, v fb =0.88v, v lx =0v - 0.01 1.00 (*8) a current limit i lim v in =v ce =5.0v, v fb =0.72v (*9) - 4.0 - a output voltage temperature characteristics v out / (v out ? topr) i out =100ma -40 Q to p r Q 85 when connected to external components - 100 - ppm/ ce?h? voltage v ceh v in =5.0v, v fb =0.72v applied voltage to v ce voltage changes lx to ?h? level 1.2 - v in v ce?l? voltage v cel v in =5.0v, v fb =0.72v applied to v ce voltage changes lx to ?l? level agnd - 0.4 v ce?h? current i ceh v in =5.0v, v ce =5.0v, v fb =0v -0.1 - 0.1 a ce?l? current i cel v in =5.0v, v ce =0v, v fb =0v -0.1 - 0.1 a fb?h? current i fbh v in =5.0v, v ce =0v, v fb =5.0v -0.1 - 0.1 a fb?l? current i fbl vi n =5.0v, v ce =0v, v fb =0v -0.1 - 0.1 a soft-start time t ss v in =5.0v, v ce =0v 5.0v, i out =1ma when connected to external components 0.3 1.0 2.0 ms thermal shutdown temperature t tsd - 150 - - hysteresis width t hys - 20 - - c l discharge r dchg v in =5.0v, v ce =0v, v fb =0.72v, v lx =1.0v 80 130 160 note: external components: c in1 =20 f(ceramic), c in2 =1 f(ceramic), l=4.7 h(slf7055t-4r7 tdk), c l =20 f(ceramic) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf condition: unless otherwise stated, ?h?=v in ~ v in - 1.2v, ?l?=+ 0.1v ~ -0.1v (*1) mount conditions affect heat dissipation. maximum output current is not guaranteed when t tsd starts to operate earlier. (*2) when the difference between the input and the output is sma ll, some cycles may be skipped completely before current maximi zes. if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance. (*3) these values include uvlo detect voltage, uvlo release voltage and hysteresis operating voltage range. uvlo release voltage is defined as the v in voltage which makes lx pin ?h?. (*4) xc9242 series exclude i pfm and dty limit_pfm because those are only for the pfm control?s functions. (*5) effi = { ( output voltage output current ) ?? ( input voltage input current) } 100 (*6) on resistance = (v in ? lx pin measurement voltage) / 100ma (*7) design value (*8) when temperature is high, a current of approximately 20 a (maximum) may leak. (*9) current limit denotes the level of detection at peak of coil current.
6/29 xc9242/xc9243 series ? electrical characteristics (continued) xc9242/xc9243, f osc =2.4mhz, ta=25 parameter symbol conditions min. typ. max. unit circuit fb voltage v fb v in = v ce =5.0v voltage to start oscillation while v fb =0.72v 0.88v 0.784 0.800 0.816 v operating voltage range v in when connected to external components 2.7 - 6.0 v maximum output current i outmax v in =v ce =5.0v (*1,*2) when connected to external components 2.0 - - a uvlo voltage v uvlo v ce =5.0v, v fb =0.72v voltage which lx pin holding ?l? level (*3) 2.00 - 2.68 v quiescent current i q v in =v ce =5.0v, v fb =0.88v - 53 92 a stand-by current i stb v in =5.0v, v ce =0v, v fb =0.88v - 0.01 1.00 a oscillation frequency f osc v in =v ce =5.0v, i out =1000ma when connected to external components 2040 2400 2760 khz pfm switch current (*4) i pfm v in =v ce =6.0v, i out =1ma when connected to external components - 680 - ma pfm duty limit (*4) dty limit_pfm v in =v ce =2.7v, i out =1ma when connected to external components - 180 250 % maximum duty limit d max v in =v ce =5.0v, v fb =0.72v 100 - - % minimum duty limit d min v in =v ce =5.0v, v fb =0.88v - - 0 % efficiency effi v in =v ce =5.0v, i out =500ma (*5) r fb1 =47k , r fb2 =15k , c fb =330pf - 95 - % lxsw?h?on resistance r lxh v in =v ce =4.0v, v fb =0.72v (*6) - 0.11 0.21 lxsw?l?on resistance r lxl - 0.12 ? 0.30 (*7) - lxsw?h? leakage current i leakh v in =5.0v, v ce =0v, v fb =0.88v, v lx =0v - 0.01 1.00 (*8) a current limit i lim v in =v ce =5.0v, v fb =0.72v (*9) - 4.0 - a output voltage temperature characteristics v out / (v out ? topr) i out =100ma -40 Q to p r Q 85 when connected to external components - 100 - ppm/ ce?h? voltage v ceh v in =5.0v, v fb =0.72v applied voltage to v ce voltage changes lx to ?h? level 1.2 - v in v ce?l? voltage v cel v in =5.0v, v fb =0.72v applied voltage to v ce voltage changes lx to ?l? level agnd - 0.4 v ce?h? current i ceh v in =5.0v, v ce =5.0v, v fb =0v -0.1 - 0.1 a ce?l? current i cel v in =5.0v, v ce =0v, v fb =0v -0.1 - 0.1 a fb?h? current i fbh v in =5.0v,v ce =0v, v fb =5.0v -0.1 - 0.1 a fb?l? current i fbl vi n =5.0v,v ce =0v, v fb =0v -0.1 - 0.1 a soft-start time t ss v in =5.0v, v ce =0v 5.0v, i out =1ma when connected to external components 0.3 1.0 2.0 ms thermal shutdown temperature t tsd - 150 - - hysteresis width t hys - 20 - - c l discharge r dchg v in =5.0v, v ce =0v, v fb =0.72v, v lx =1.0v 80 130 160 note: external components: c in1 =20 f(ceramic), c in2 =1 f(ceramic), l=2.2 h(slf7055t-2r2 tdk), c l =20 f(ceramic) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf condition: unless otherwise stated, ?h?= v in ~ vi n - 1.2v, ?l?= + 0.1v ~ -0.1v (*1) mount conditions affect heat dissipation. maximum output current is not guaranteed when t tsd starts to operate earlier. (*2) when the difference between the input and the output is sma ll, some cycles may be skipped completely before current maximi zes. if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance. (*3) these values include uvlo detect voltage, uvlo release voltage and hysteresis operating voltage range. uvlo release voltage is defined as the v in voltage which makes lx pin ?h?. (*4) xc9242 series exclude i pfm and dty limit_pfm because those are only for the pfm control?s functions. (*5) effi = { ( output voltage output current ) ?? ( input voltage input current) } 100 (*6) on resistance = (v in ? lx pin measurement voltage) / 100ma (*7) design value (*8) when temperature is high, a current of approximately 20 a (maximum) may leak. (*9) current limit denotes the level of detection at peak of coil current.
7/29 xc9242/xc9243 series typical application circuit xc9242/xc9243 series external components output voltage can be set by adding external split resistors. output voltage is determined by the following equation, based on the values of rfb1 and rfb2. the sum of rfb1 and rfb2 should normally be 100k or less. output voltage range is 0.9v~5.5v by a 0.8v (2.0%) reference voltage. when input voltage (v in ) Q setting output voltage, output voltage (v out ) can not output the power more than input voltage (v in ). vout = 0.8 x (rfb1 + rfb2) / rfb2 the value of c fb , speed-up capacitor for phase compensation, should be f zfb = 1 / (2 x x cfb x rfb1) which is equal to 10khz. adjustments are required from 1khz to 10khz depending on the application, value of inductance (l), and value of load capacitance (c l ). [example of calculation] when r fb1 =47k ? , r fb2 =15k ? , v out =0.8(47k ? +15k ? ) / 15k ? =3.3v when c fb =330pf, fzfb= 1/(2 330pf 47 k ? ) =10.26khz 1.2mhz 2.4mhz l: 4.7 h(slf7055t-4r7) l: 2.2 h(slf7055t-2r2) 4.7 h(spm6530t-4r7) 2.2 h(spm6530t-2r2) c in1 : 20 f (lmk212abj106kg 10v/10 f x2) c in1 : 20 f (lmk212abj106kg 10v/10 f x2) c in2 1 f (lmk107bj105ka 10v/1 f x1) c in2 1 f (lmk107bj105ka 10v/1 f x1) c l : 20 f (lmk212abj106kg 10v/10 f x2) c l : 20 f (lmk212abj106kg 10v/10 f x2) v out r fb1 r fb2 c fb v out r fb1 r fb2 c fb (v) (k ? ) (k ? ) (pf) (v) (k ? ) (k ? ) (pf) 1.0 7.5 30 2000 2.5 51 24 300 1.2 15 30 1000 3.0 33 12 470 1.5 26 30 560 3.3 47 15 330 1.8 30 24 510 5.0 43 8.2 390
8/29 xc9242/xc9243 series ? operational description the xc9242/xc9243 series consists of a re ference voltage source, ramp wave circui t, error amplifier, pwm comparator, phase compensation circuit, output voltage adjustment resistors, p-channel mos driver transis tor, n-channel mos switching transistor for the synchronous switch, current limiter circuit, uvlo circuit and others. (see the block di agram above.) the series ics compare, u sing the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the fb pin. phase compensation is performed on the resulting error amplifier output, to input a signal to the pwm comparator to determine the turn-on time during pwm operatio n. the pwm comparator compares, in terms of voltage level, the signal from t he error amplifier with the ramp wave from the ramp wave circu it, and delivers the resulting output to the buffer driver ci rcuit to cause the lx pin to output a swit ching duty cycle. this process is contin uously performed to ensure stable output voltage. the current feedback circuit monito rs the p-channel mos driver transistor current for each switc hing operation, and modulates the error amplifier output signal to provide mu ltiple feedback signals. this enables a stable feedback loop even when a low esr capacitor such as a ceramic capacitor is used ensuring stable output voltage. the reference voltage source provides the reference volt age to ensure stable output voltage of the dc/dc converter. the ramp wave circuit determines switching frequency. the freque ncy is fixed internally and can be selected from 1.2mhz or 2.4 mhz. clock pulses generated in this circuit are used to produce ramp waveforms needed for pwm operation, and to synchronize all the internal circuits. the error amplifier is designed to monitor output voltage. the am plifier compares the reference voltage with the feedback volt age divided by the external split resistors, r1 and r2. when a voltage lower than the reference voltage is fed back, the output voltage of th e error amplifier increases. the gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized s ignal to the mixer. the xc9242/xc0243 series includes a fold-bac k circuit, which aids the operation of t he current limiter and circuit protection. the xc9242/xc9243 series monitors the current flow ing through the p-channel mos driver transistor when current flowing through p-channel mos dr iver transistor reaches current limit i lim , the current limiter circuit operates to limit the inductor current i lx . if this state continues, the fold-ba ck circuit operates and limit the output current in order to protect the ic from damage. the output voltage is automatically resumed if the load goes ligh t. when it is resumed, the soft-start function operates.
9/29 xc9242/xc9243 series 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 101214161820 discharge time: t(ms) output voltage: v out (v) vout = 1. 2v vout = 1. 8v vout = 3. 3v output voltage dischage characteristics rdischg = 130 ? (typ.) v out =1.2v v out =1.8v v out =3.3v c l =20 f operational description (continued) for protection against heat damage, the thermal shutdown function monitors chip temperat ure. when the chip?s temperature reach es 150 o c (typ.), the thermal shutdown circuit starts operating and the p-channel driver transistor will be turned off. at the same ti me, the output voltage decreases. when the temperature drops to 130 o c (typ.) after shutting off the current flow, the ic performs the soft start function to initiate output startup operation. < function of ce pin > the xc9242/9243 series will enter into stand-by mode by inputting a low level signal to the ce pin. during a stand-by mode, th e current consumption of the ic becomes 0 a (typ.). the ic starts its operation by inputting a high level signal to the ce pin. the input of the ce pin is a cmos input and the sink current is 0 a (typ.). when the vin pin voltage becomes 2.4v (typ.) or lower, the p-c hannel mos driver transistor output driver transistor is forced o ff to prevent false pulse output caused by unstable oper ation of the internal circuitry. when the v in pin voltage becomes 2.68v (max.) or higher, switching operation takes place. by releas ing the uvlo function, the ic performs the soft start function to initiate output st artup operation. the soft start function operates even when the vin pin voltage falls momentarily below the uvlo operating voltage. the uvlo ci rcuit does not cause a complete shutdown of the ic, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. the xc9242/xc9243 series provide 1.0ms (typ). soft start time is defined as the time interval to reach 90% of the output voltag e from the time when the v ce is turned on. the xc9242/xc9243 series 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 inputted via the n-channel mos switch transistor located between the l x pin and the v 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. discharge time of the output capacitor (c l ) is set by the c l auto-discharge resistance (r) and the output capacitor (c l ). by setting time constant of a c l auto-discharge resistance value [r] and an output capacitor value (c l ) as ( =c x r), discharge time of the output voltage after discharge via the n-channel transistor is calculated by the following formulas. ???????? v = v out(e) e -t / or t = ln (v out(e) /v) v : output voltage after discharge v out(e) : output voltage t: discharge time : c l r dchg c l : capacitance of output capacitor r dchg : c l auto-discharge resistance r dchg
10/29 xc9242/xc9243 series operational description (continued) (*1) in pfm control operation, until coil current reaches to a specif ied level (ipfm), the ic keeps the p-channel mos driver transis tor on. in this case, time that the p-channel mos driver transistor is kept on (t on ) can be given by the following formula. please refer to i pfm ? t on = l i pfm / (v in - v out ) < pfm duty limit > (*1) in pfm control operation, the pfm duty limit (dty limit_pfm ) is set to 200% (typ.). therefore, under the condition that the duty increases (e.g. the condition that the step-down ratio is small), it?s possible for p-channel mos driver transistor to be turned off even when coil current doesn?t reach to ipfm. please refer to i pfm (*1) xc9242 series is excluded. fig. fig.
11/29 xc9242/xc9243 series note on use 1. please use this ic within the stated maximum ratings. for temporary, transitional voltage drop or voltage rising phenomenon , the ic is liable to malfuncti on should the ratings be exceeded. 2. where wiring impedance is high, operations may become un stable due to noise and/or phase lag depending on output current. please wire the input capacitor (c in ) and the output capacitor (c l ) as close to the ic as possible. 3. when the difference between v in and v out is large in pwm control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 4. when the difference between v in and v out is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely. 5. with the ic, the peak current of the coil is controlled by the current limit circuit. sinc e the peak current increases whe n dropout voltage or load current is high, current limit starts operation, and this can lead to instability. when peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. in addition, please calculate the peak current according to the follow ing formula: ipk = (v in -v out )onduty / (2lf osc ) + i out l : coil inductance value f osc : oscillation frequency 6. use of the ic at voltages below the recommended voltage range may lead to instability. 7. this ic should be used within the stated absolute ma ximum ratings in order to prevent damage to the device. 8. when the ic is used in high temperature, output voltage ma y increase up to input voltage level at no load because of the le ak current of the p-channel driver transistor. 9. the xc9242/xc9243 uses fold-back circuit limiter. however, fold-back may become ?droop? affected by the wiring conditions. care must be taken especially for c in distance and position. 10. if c l capacitance reduction happens such as in the case of low temper ature, the ic may enter unstable operation. care must be taken for c l capacitor selection and its capacitance value. 1ch v lx 2.0v/di 2ch v out 50mv/di ta = - 50 v in = 3.6v, v out = 0.9v, f osc = 2.4mhz c in = 20 f(ceramic) c l = 14.7 f(ceramic) i out = 300ma ??? 11. torex places an importance on impr oving our products and its reliability. however, by any possibility, we would request user fail- safe design and post-aging treatment on system or equipment. x-axis : 2.0 s / div
12/29 xc9242/xc9243 series note on use (continued) ? instructions of pattern layouts 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 pvin & pgnd pins and the avin & agnd pins. 2. make sure to avoid noise from the pvin pin to the avin pin. please connect the agnd pin and pgnd pin in the shortest lengt h for wiring. 3. please mount each external component as close to the ic as possible. 4. wire external components as close to the ic as possible and use thick, short connecting trac es to reduce the circuit impeda nce. 5. this series? internal driver tran sistors bring on heat because of the output cu rrent and on resistance of p-channel and n-c hannel mos drive r transistors. 6. make sure that the pcb gnd traces are as thick as possible, as variations in ground potential caused by high ground current s at the time o f switching may result in instability of the ic. ? pcb (usp-10b) ????????????????? typical application circuit (usp-10b) 1) xc9242/xc9243 series ????????????? 1) xc9242/xc9243 series 1 st layer(usp-10b) ????????????? 2 nd layer(usp-10b) 3 rd layer(usp-10b) ????????????? 4 th layer(usp-10b) us p- 1 0b
13/29 xc9242/xc9243 series note on use (continued) 1 st layer(sop-8fd) ????????????????? 2 nd layer(sop-8fd) 3 rd layer(sop-8fd) ???????????????? 4 th layer(sop-8fd) ? pcb sop8-fd) ???????????????? typical application circuit sop8-fd) ? 1) xc9242/xc9243 series ????????????? 1) xc9242/xc9243 series
14/29 xc9242/xc9243 series test circuits
15/29 xc9242/xc9243 series typical performance characteristics (1) efficiency vs. output current (2) output voltage vs. output current xc9242b08c (v out =1.2v) 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 (%) v in =3.7v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf v in =5.0v xc9243b08c (v out =1.2v) 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 (%) v in =3.7v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf v in =5.0v xc9242b08c (v out =1.2v) 1 1.1 1.2 1.3 1.4 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) v in =3.7v, 5.0v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf xc9242b08d (v out =1.2v) 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 (%) v in =3.7v l=2.2h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 = 15k, r fb2 = 30k, c fb = 1000pf v in =5.0v xc9243b08d (v out =1.2v) 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 (%) v in =3.7v l=2.2h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 = 15k, r fb2 = 30k, c fb = 1000pf v in =5.0v xc9243b08c (v out =1.2v) 1 1.1 1.2 1.3 1.4 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) v in =3.7v, 5.0v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 = 15k, r fb2 = 30k, c fb = 1000pf
16/29 xc9242/xc9243 series typical performance chara cteristics (continued) (2) output voltage vs. output current (3) ripple voltage vs. output current xc9242b08c (v out =1.2v) 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) v in = 3.7v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf v in = 5.0v xc9243b08c (v out =1.2v) 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) v in = 3.7v l=4.7h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf v in = 5.0v xc9242b08d (v out =1.2v) 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) v in = 5.0v, 3.7v l=2.2h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf xc9243b08d (v out =1.2v) 1 1.1 1.2 1.3 1.4 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) v in =3.7v, 5.0v l=2.2h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf xc9242b08d (v out =1.2v) 1 1.1 1.2 1.3 1.4 0.1 1 10 100 1000 10000 output current: i out (ma) output voltage: v out (v) v in =3.7v, 5.0v l=2.2h(slf7055),cin=20f(lmk212abj106kgx2) cin=1f(lmk107bj105kax1),cl=20f(lmk212abj106kgx2) rfb1=15k, rfb2=30k, cfb=1000pf xc9243b08d (v out =1.2v) 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) v in = 3.7v l=2.2h(slf7055),c in =20f(lmk212abj106kgx2) c in =1f(lmk107bj105kax1),c l =20f(lmk212abj106kgx2) r fb1 =15k, r fb2 =30k, c fb =1000pf v in = 5.0v
17/29 xc9242/xc9243 series typical performance chara cteristics (continued) (4) fb voltage vs. ambient temperature (5) uvlo voltage vs. ambient temperature (6) quiescent current vs. ambient temperature (7) stand-by current vs. ambient temperature xc9242b08c 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86 0.88 -50 -25 0 25 50 75 100 ambient temperature: ta () feedback voltage: v fb (v) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 ambient temperature: ta () quiescent current: iq (a) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 ambient temperature: ta () standby current: i stb (a) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 -50 -25 0 25 50 75 100 ambient temperature: ta () uvlo voltage: uvlo (v) uvlo xc9242b08d 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 ambient temperature: ta () quiescent current: iq (a) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08d 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 ambient temperature: ta () standby current: i stb (a) vin = 6.0v vin = 5.0v vin = 4.0v
18/29 xc9242/xc9243 series typical performance characteristics (continued) (8) oscillation frequency vs. ambient temperature (9) pfm switching current vs. ambient temperature (10) pfm duty limit vs. ambient temperature xc9242b08c 600 800 1000 1200 1400 1600 1800 -50 -25 0 25 50 75 100 ambient temperature: ta () oscillation freqency: f osc (khz) vin = 6.0v vin = 5.0v vin = 4.0v xc9243b08c 0 100 200 300 400 500 600 700 800 900 1000 -50 -25 0 25 50 75 100 ambient temperature: ta () pfm sw current: i pfm (ma) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08d 1800 2000 2200 2400 2600 2800 3000 -50 -25 0 25 50 75 100 ambient temperature: ta () oscillation freqency: f osc (khz) vin = 6.0v vin = 5.0v vin = 4.0v xc9243b08d 0 200 400 600 800 1000 1200 1400 1600 1800 2000 -50 -25 0 25 50 75 100 ambient temperature: ta () pfm sw current: i pfm (ma) vin = 6.0v vin = 5.0v vin = 4.0v xc9243b08 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature: ta () pfm duty limit: dty limit_pfm (%) xc9243b08d 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature: ta () pfm duty limit: dty limit_pfm (%)
19/29 xc9242/xc9243 series typical performance characteristics (continued) (11) pch driver on resistance vs. ambient temperature (12) nch driver on resistance vs. ambient temperature (13) lxsw?h? leakage current vs. ambient temperature (14) current limit vs. ambient temperature (15) ce?h? voltage vs. ambient temperature ( 16) ce?l? voltage vs. ambient temperature xc9242b08c 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature: ta () lx sw pch on resistance: r lxh (m) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 ambient temperature : ta () lxswh leakage current: i lx (a) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature: ta () lx sw nch on resistance: r lxl (m) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -50 -25 0 25 50 75 100 ambient temperature: ta () ceh voltage v ceh (v) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -50 -25 0 25 50 75 100 ambient temperature: ta () cel voltage v cel (v) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 2000 3000 4000 5000 6000 7000 8000 -50 -25 0 25 50 75 100 ambient temperature : ta () current limit: i lim (ma) vin = 6.0v vin = 5.0v vin = 4.0v
20/29 xc9242/xc9243 series typical performance chara cteristics (continued) (17) soft-start time vs. ambient temperature (18) c l discharge resistance vs. ambient temperature xc9242b08c 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -50 -25 0 25 50 75 100 ambient temperature: ta () soft-start time: t ss (ms) vin = 6.0v vin = 5.0v vin = 4.0v xc9242b08c 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature: ta () c l discharge resistance: r dchg () vin = 6.0v vin = 5.0v vin = 4.0v
21/29 xc9242/xc9243 series typical performance characteristics (continued) (19) load transient response xc9242b08c l=4.7 h(slf7055),c in1 =20 f(lmk212abj106kgx2) c in2 =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in = 5.0v, v out = 1.2v, i out = 1ma ? 1.5 v in = 5.0v, v out = 1.2v, i out = 1.5a ? 1m v out : 100mv/div i lx : 1.0a/div v out : 200mv/div i lx : 1.0a/div xc9243b08c l=4.7 h(slf7055),c in1 =20 f(lmk212abj106kgx2) c in2 =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in = 5.0v, v out = 1.2v, i out = 1ma ? 1.5 v in = 5.0v, v out = 1.2v, i out = 1.5a ? 1m v out : 100mv/div i lx : 1.0a/div v out : 200mv/div i lx : 1.0a/div x-axis : 10 s / div x-axis : 10 s / div x-axis : 10 s / div x-axis : 1ms / div
22/29 xc9242/xc9243 series typical performance chara cteristics (continued) (19) load transient response xc9242b08d l=2.2 h(slf7055),c in1 =20 f(lmk212abj106kgx2) c in2 =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in = 5.0v, v out = 1.2v, i out = 1ma ?1.5 v in = 5.0v, v out = 1.2v, i out = 1.5a ?1m v out : 100mv/div i lx : 1.0a/div v out : 200mv/div i lx : 1.0a/div xc9243b08d l=2.2 h(slf7055),c in1 =20 f(lmk212abj106kgx2) c in2 =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in = 5.0v, v out = 1.2v, i out = 1ma ? 1.5 v in = 5.0v, v out = 1.2v, i out = 1.5a ? 1m v out : 200mv/div i lx : 1.0a/div i lx : 1.0a/div v out : 100mv/div x-axis : 10 s / div x-axis : 10 s / div x-axis : 10 s / div x-axis : 1ms / div
23/29 xc9242/xc9243 series typical performance chara cteristics (continued) (20) frequency response test condition: measurement equipment:nf fra5097 version:3.00 osc amplitude=20.0mvpeak osc.dcbias=0.00v osc waveform:sin, sweep minimum frequency=1hz sweep maximum frequency=15mhz sweep resolution=300steps/sweep integration period=100cycle, delay time=0cycle order of harmonic analysis=1, measure mode:ch1&ch2 auto integration:off, amplitude compression:off slow sweep:off xc9242b08cdr l=4.7 h(slf7055), c in =20 f(lmk212abj106kgx2) c in =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in =5.0v, v ce =v in , v out =1.2v, i out =1ma l=4.7 h(slf7055),c in =20 f(lmk212abj106kgx2) c in =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in =5.0v, v ce =v in , v out =1.2v, i out =1000ma
24/29 xc9242/xc9243 series typical performance chara cteristics (continued) (20) frequency response (continued) test condition: measurement equipment:nf fra5097 version:3.00 osc amplitude=20.0mvpeak osc.dcbias=0.00v osc waveform:sin, sweep minimum frequency=1hz sweep maximum frequency=15mhz sweep resolution=300steps/sweep integration period=100cycle, delay time=0cycle order of harmonic analysis=1, measure mode:ch1&ch2 auto integration:off, amplitude compression:off slow sweep:off xc9242b08ddr l=2.2 h(slf7055),c in =20 f(lmk212abj106kgx2) c in =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in =5.0v, v ce =v in , v out =1.2v, i out =1ma l=2.2 h(slf7055),c in =20 f(lmk212abj106kgx2) c in =1 f(lmk107bj105kax1),c l =20 f(lmk212abj106kgx2) r fb1 =15k ? , r fb2 =30k ? , c fb =1000pf v in =5.0v, v ce =v in , v out =1.2v, i out =1000ma
25/29 xc9242/xc9243 series packaging information ? usp-10b (unit: mm) ? usp-10b ? reference pattern layout (unit: mm) ????????? usp-10b ?? reference metal mask design (unit: mm) 12345 9 876 2.90.05 10 2.50.05 0.125 0.15 0.20.05 0.20.05 0.20.05 0.450.05 0.450.05 0.10.03 (0.65) (0.65) (0.5) (0.5) 0.10.03 1pin indent (0.45) (0.2) 0.30 0.55 0.55 1.05 1.05 0.25 0.475 0.125 1.25 1.35 1.25 1.35 0.2375 0.675 0.4375 0.2 0.5 0.25
26/29 xc9242/xc9243 series ? packaging information (continued) ? sop-8fd (unit: mm) ? sop-8fd ? reference pattern layout (unit: mm) ????????? sop-8fd ?? reference metal mask design (unit: mm) 0.6 3.3 2.4 1.62 1.27 4.88 1.27 4.88 0.5 1.0 1.0 2.3 1.52 3.90.1 6.00.2 0.4 min 0 0.11 1.45 1.550.2 (2.4)
27/29 xc9242/xc9243 series 8 7 6 1 2 3 4 5 9 10 marking rule ? represents product series represents product function represents reference voltage represents oscillation frequency ? represents production lot number 01 to 09, 0a to 0z, 11 to 9z, a1 to a9, aa to az, b1 to zz repeated (g, i, j, o, q, w excluded) *no character inversion used. mark product series b xc9242******-g c xc9243******-g mark function product series b c l high speed discharge xc924*b*****-g mark output voltage (v) product series 8 0.8 xc924*b08***-g mark oscillation frequency (mhz) product series c 1.2 xc924*b**c**-g d 2.4 xc924*b**d**-g ? usp-10b
28/29 xc9242/xc9243 series marking rule (continued) represents product series represents product function represents oscillation frequency ? represents production lot number 01 to 09, 0a to 0z, a1 to a9, aa to az, b1 to zz repeated (g, i, j, o, q, w excluded) *no character inversion used. mark product series b xc9242******-g c xc9243******-g mark function product series b c l high speed discharge xc924*b*****-g mark oscillation frequency (mhz) product series c 1.2 xc924*b**c**-g d 2.4 xc924*b**d**-g ? sop-8fd
29/29 xc9242/xc9243 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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