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1/31 xc9246/XC9247 series 16v driver transistor built-in st ep-down dc/dc converters general description ? xc9246/XC9247 series is a 16v step-down dc/dc converter with a built-in driver transistor. the series provides high efficiency, and a stable power supply with output currents up to 1a. the series is designed for use with small ceramic capacit ors. the series has a 1.0v reference voltage, and using externally co nnected resistors, the output vo ltage can be set freely. with an internal switching frequency of 1.2mhz, small external components can be used. the soft-start time is internally set to 1.5ms (typ.), but can be adjusted to set a longer time using an external resistor and capacitor. as for operation mode, the xc9246 series is pwm control and the XC9247 series is automatic pwm/pfm switching control. in pwm/pfm switching control mode, provi des fast response, low ripple and high effici ency over the full range of loads (from li ght load to heavy load). with the uvlo (under voltage lock out) func tion, the internal driver transistor is forced off when input voltage becomes lower than detect voltage. the series includes current limit, thermal shutdown, and short-circuit protection. two types of package sot-26w and usp-6c are available. applications ? lcd-tvs ? bd/hdd ? recorders ? set top box ? ? home video game consoles ?? ? multifunction printers ? typical application circuit etr05024-004 ? greenoperation-compatible typical performance characteristics features input voltage : 4.5v 16v (the v in range depends on the product) output voltage range : 1.2v 5.6v (v fb =1.0v) (the v out range depends on the product) output current : 1a (v in R 6v and v out /v in Q 50%) 1a (v in 6v and v out /v in Q 40%) efficiency : 90%(v in =12v, v out =5v, i out =200ma) oscillation frequency : 1.2mhz maximum duty cycle : 80% soft-start time : internally fixed 1.5ms adjustable by rc control methods : pwm control (xc9246) pwm/pfm automatic switching control (XC9247) protection circuits : current limiter (integral latching) thermal shutdown short-circuit protection uvlo : 4.15v, 5.65v, 7.65v output capacitor : ceramic capacitor compatible operating ambient temperature :-40 +85 packages : usp-6c, sot-26w environmentally friendly : eu rohs compliant, pb free ? xc9246b75/XC9247b75 (v out =5.0v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current :i out (ma) efficiency :effi(%) xc9246@vin=12v XC9247@vin=12v l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f( tm k316bj106kl) , c l =10 f2( lm k212abj106kg)
2/31 xc9246/XC9247 series block diagram (*1) (*2) (*3) product classification designator item symbol description 42 4.15v (1.2v Q v out Q 2.7v) 65 5.65v (1.2v Q v out Q 3.8v) ? uvlo release voltage 75 7.65v (xc9246: 1.5v Q v out Q 5.0v) (XC9247: 1.5v Q v out Q 5.6v) oscillation frequency c 1.2mhz er-g usp-6c (3,000/reel) ? - (*1) packages (order unit) mr-g sot-26w (3,000/reel) selection guide type en/ss current limit latch uvlo thermal shutdown b yes yes yes yes yes xc9246b ????? - ? pwm control XC9247b ????? - ? pwm/pfm automatic switching control ? ordering information (*1) the ?-g? suffix denotes halogen and antimony free as well as being fully rohs compliant. (*1) diodes inside the circuit are an esd protection diode and a parasitic diode. (*2) the xc9246 offers a fixed pwm control, a control logic to pwm/pfm selector is fixed internally. (*3) the XC9247 control scheme is a fixed pwm/pfm automatic switching, a control logic to pwm/pfm se lector is fixed internally.
3/31 xc9246/XC9247 series pin configuration pin assignment pin number sot-26w usp-6c pin name functions 1 6 bst pre driver supply 2 5 gnd ground 3 4 fb output voltage monitor 4 3 en/ss enable soft-start 5 2 v in power input 6 1 lx switching output function pin name signal status l stand-by en/ss (*1) h active (*1) please do not leave the en/ss pin open. (*1) the dissipation pad for the usp-6c package should be solder-pla ted in recommended mount pattern and metal masking so as to enh ance mounting strength and heat release. if the pad needs to be connected to other pins, it should be connected to the gnd (no. 5) p in.
4/31 xc9246/XC9247 series absolute maximum ratings parameter symbol ratings units v in pin voltage v in -0.3 +22.0 v bst pin voltage v bst -0.3 +22.0 and lx-0.3 lx+6.0 v fb pin voltage v fb -0.3 +6.0 v en/ss pin voltage v en/ss -0.3 +22.0 v lx pin voltage v lx -0.3 v in +0.3 or v bst +0.3 or 22.0 (*1) v lx pin current i lx 4000 ma sot-26w 250 power dissipation usp-6c pd 120 mw operating ambient temperature topr -40 +85 storage temperature tstg -55 +125 all voltages are described based on the agnd and p gnd pin. (*1) the maximum value is the lowest one among v in +0.3v, v bst + 0.3v or +22v. ta = 2 5 ?
5/31 xc9246/XC9247 series electrical characteristics xc9246/XC9247 series parameter symbol conditions min. typ. max. units circuit fb voltage v fb v in =12v, v en/ss =5v, v fb =0.9v 1.1v voltage to start oscillation while d1 (*1) v operating voltage range v in - d2 (*1) v maximum output current i outmax - 1000 - - ma uvlo detection voltage v uvlod v en/ss =5v, v fb =0.9v voltage which lx pin holding ?l? level (*6) d3 (*1) v uvlo release voltage v uvlor v en/ss =5v, v fb =0.9v voltage to start oscillation while d4 (*1) v uvlo hysteresis voltage v uvlohys - d5 (*1) v - supply current i q v in =12v, v en/ss =5v, v fb =1.1v - 150 300 a stand-by current i stb v in =16v, v en/ss =0v - 6 15 a oscillation frequency f osc v in =12v, v en/ss =5v, v fb =0.9v 1020 1200 1380 khz maximum duty cycle d max v in =12v, v en/ss =5v, v fb =0.9v 72 80 88 % minimum duty cycle d min v in =12v, v en/ss =5v, v fb =1.1v - - 0 % pfm switch current (*2) i pfm v in =12v, v en/ss =5v, v out =3.3v, i out =10ma when connected to external components - 300 - ma pfm duty limit (*2) dty limit_pfm - - 200 - % lx sw on resistance r lx v in =12v, v en/ss =5v, v fb =0.9v - 0.35 (*4) 0.5 (*4) ? - current limit (*5) i lim v in =12v, v en/ss =5v, v fb =0.9v 1600 2500 - ma integral latch time t lat v in =12v, v en/ss =5v, v fb =0.9v 0.75 1.5 3 ms short detect voltage v short sweeping v fb , v in =12v, v en/ss =5v, short v out at1 ? resistance, v fb voltage which lx becomes ?l? level within 300 s 0.3 0.5 0.7 v internal soft-start time t ss 1 v in =12v, v en/ss =0v 5v,v fb =0.9v 0.75 1.5 3 ms external soft-start time t ss 2 v in =12v, v en/ss =0v 5v, v fb =0.9v r ss =120k ? , c ss =0.47 f when connected to external components 18 26 35 ms efficiency effi target output voltage=5.0v v in =12v, i out =200ma (*3) - 90 - % output voltage temperature characteristics v out / (v out ? topr i out =100ma -40 Q topr Q 85 - 100 - ppm/ thermal shutdown temperature t tsd - - 150 - - hysteresis width t hys - - 20 - - en/ss "h" voltage v en/ssh v in =12v, v fb =v fb(e) -10mv (*7) , v en/ss =5v 1v, voltage to stop oscillation while - 2.0 2.5 v en/ss "l" voltage v en/ssl v in =12v, v fb =0v v en/ss =5v 0v, voltage to stop oscillation while 0.4 - - v en/ss "h" current i en/ssh v in =v en/ss =16v - 7 15 a en/ss "l" current i en/ssl v in =12v, v en/ss =0v -0.1 - 0.1 a fb "h" current i fbh v in =12v, v en/ss =0v, v fb =5.5v -0.1 - 0.1 a fb "l" current i fbl v in =12v, v en/ss =0v, v fb =0v -0.1 - 0.1 a lx "l" current i lxl v in =16v, v en/ss =5v, v fb =1.1v, v lx =0v -7.5 -4 - a unless otherwise stated, v in =12v, v en/ss =5v (*1) please refer to spec table below. (*2) as the xc9246 series work in the pwm control operation only, i pfm and dty limit_pfm are not for xc9246 series. (*3) effi=[(output voltage x output current)(input voltage x input current)]100 (*4) design value (*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) v fb(e) is effective value of fb voltage. ta = 2 5 ?
6/31 xc9246/XC9247 series electrical characteristics (continued) ? spec table ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? sot-26w usp-6c no. parameter synbol min. typ. max. min. typ. max. units d1 fb voltage v fb 0.985 1.000 1.015 0.98 1.00 1.02 v xc9246b42/XC9247b42 xc9246b65/XC9247b65 xc9246b75/XC9247b75 no. parameter synbol min. typ. max. min. typ. max. min. typ. max. units d2 operating voltage range v in 4.5 - 16.0 6.0 - 16.0 8.0 - 16.0 v d3 uvlo detection voltage v uvlod 3.7 4.0 - 4.8 5.5 - 6.9 7.4 - v d4 uvlo release voltage v uvlor - 4.15 4.48 - 5.65 5.98 - 7.65 7.98 v d5 uvlo hysteresis voltage v uvlohys - 0.12 - - 0.15 - - 0.25 - v
7/31 xc9246/XC9247 series test circuits v in fb lx bst en/ss gnd waveform check point sbd l c l c in c bst external components c in :10f(ceramic) c l :22f(ceramic) c bst :0.22f(ceramic) l:4.7h sbd:xbs204s17r-g v in fb lx bst en/ss gnd 1f 0.22f v in fb lx bst en/ss gnd waveform check point sbd l c bst c l c in external components c in :10f(ceramic) c l :22f(ceramic) c bst :0.22f(ceramic) l:4.7h sbd:xbs204s17r-g v in fb lx bst en/ss gnd waveform check point c in sbd l c l r fb1 c bst c fb r fb2 external components c in :10f(ceramic) c l :22f(ceramic) c l :47 f (ceramic) (*1) c bst :0.22f(ceramic) l:4.7h sbd:xbs204s17r-g (*1) output voltage temperature characteristics target output voltage=3.3v r fb1 :62k r fb2 :27k c fb :130pf target output voltage=5.0v r fb1 :30k r fb2 :7.5k c fb :270pf
8/31 xc9246/XC9247 series test circuits (continued)
9/31 xc9246/XC9247 series typical application circuit ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? typical examples ? manufacturer product number value coilcraft xfl4020-332meb 3.3 h coilcraft xfl4020-472meb 4.7 h tdk vlp4045lt-4r7m 4.7 h l tdk vlp4045lt-6r8m 6.8 h torex xbs204s17r vf=0.42v(1a) torex xbs203v17r vf=0.305v(1a) shindengen d1fj4 vf=0.48v(1a) vishay ss2p3l vf=0.45v(2a) sbd (*1) toshiba cms17 vf=0.42v(1a) tdk c2012x5r1e106k 10 f/25v c in taiyo yuden tmk316bj106kl 10 f/25v tdk c2012x5r1a106k 10 f/10v 2parallel c l taiyo yuden lmk212abj106kg 10 f/10v 2parallel c bst 0.22 f/10v (*1) the inter-terminal capacitance of the schottk y barrier diode should be around 180pf. ct test conditions: f=1mhz, v r =1v ? ? ? recommended l value and v out range v out recommended l value (*1) 1.2v Q v out Q 3.5v 3.3 h 4.7 h 3.5v v out Q 4.0v - 4.7 h 4.0v v out Q 5.6v - 6.8 h (*1) for the coil value (l), use a component with 20% accuracy or less. ? ? ? ? ? ?
10/31 xc9246/XC9247 series typical application circuit (continued) the output voltage can be set by connecting external dividing resi stors. the output voltage is determined by the values of r fb1 and r fb2 as given in the equation below. the total of r fb1 and r fb2 should be less than 100k ? or less. output voltage range can be set freely from 1.2v to 5.6v with a 1.0v reference voltage. (the step down ratio is determined based on the version. refer to the ?output voltage range classified by product? graph below.) however, it should be noted that the output voltage ca n not be stable when v in =16v and v out =1.2v so please set the step down ration under the condition of v out /v in x 100 R 18% v out =1.0(r fb1 +r fb2 )/r fb2 adjust the value of the phase compensation speed-up capacitor c fb so that f zfp =1 / (2 c fb x r fb1 ) is about 20khz. adjustments are required from 10khz to 50khz depending on the application, value of inductance (l), and value of load capacitance (c l ). examples when r fb1 =30k ? and r fb2 =7.5k ? , v out =1.0(30k ? +7.5k ? ) / 7.5k ? =5v when c fb =270pf, fzfb= 1/(2 270pf30k ? ) =19.65khz typical examples v out (v) r fb1 (k ? ) r fb2 (k ? ) c fb (pf) v out (v) r fb1 (k ? ) r fb2 (k ? ) c fb (pf) 1.2 15 75 510 2.5 36 24 220 1.5 18 36 430 3.0 36 18 220 1.8 24 30 330 3.3 62 27 130 2.0 47 47 160 5.0 30 7.5 270 ? ? ? ? ? ? ? ? ? ? ? ? ?
11/31 xc9246/XC9247 series typical application circuit (continued) 0.22 f is recommended for the c bst capacitance when c l =22 f. do not fix it at c bst =0.22 f for all conditions but rather change it depending on the c l capacitance (*1) . as a guideline, make it about c l :c bst =100:1. (*1) think of the c l capacitance as the total capacitance connected to the v out of xc9246/XC9247. 2 cbst optimum settings 3 c l ( f) c bst ( f) c l Q 22 0.22 22 c l Q 47 0.47 47 c l Q 100 1 100 c l Q 220 2.2 the vref voltage applied to the error amplifier is restricted by the start-up voltage of the en/ ss pin. this ensures that the error amplifier operates with its two inputs in balance, thereby pr eventing on-time signal from becoming longer than necessary. therefore, start-up time of the en/ess pin bec omes the set-time of soft-start. the soft -start time can be adjusted by adding a capacitor and a resistor to the en/ss pin. if t he en/ss pin voltage rises steeply without connecting c ss and r ss (r ss =0 ), output rises with taking the soft-start time of 1.5ms (typ.) which is fixed internally. the soft-start function operates when the voltage at the en/ss pin is between 0.4v to 2.5v. if the voltage at the en/ss pin does not start from 0v but from a mid level voltage when the power is switched on, the soft-start function will become ineffective and the possibilities of large inrush cu rrents and ripple volt ages occurring will be increased. soft-start time is approx imated by the equation below according to values of v en , r ss , and c ss . tss=- css rss in { (v en/ss ? 2) / v en/ss } example: when css=0.47 f, rss=120k ? and v en/ss =5v, t ss =-0.47x10 -6 x 120x10 3 x in((5-2)/5)=29ms (approx.) * when r ss =0 ? and c ss =0f, the soft-start time is 1.5ms (typ.) and it?s set internally.
12/31 xc9246/XC9247 series operational explanation the xc9246/XC9247 series consists of a reference voltage source (vref), an internal reference voltage source (v l ), ramp wave circuit, error amplifier, pwm compar ator, phase compensation circuit, n-ch mos dr iver transistor, current limiter circuit, short protection circuit, uvlo circuit, thermal shutdown circui t, over voltage protection, load disconnect control and others. (see the block diagram below.) by using the error amplifier, the fb pin voltage is compared with the reference voltage. the error amplifier output is sent to the pwm comparator in order to determine the duty cycle of pwm swit ching. the signal from the error amplifier is compared with the ramp wave from the ramp wave circuit, and the resulting outpu t is delivered to the buffer driver circuit to provide on-time of the duty cycle at the lx pin. this process is continuously performed to ensure stable output voltage. the current feedback circuit monitors the n-ch mos driver trans istor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback si gnals. this enables a stable feedback loop even when using a low esr capacitor such as ceramic, which resu lts in ensuring stable output voltage. the reference voltage source (vref voltage) provides the re ference voltage to ensure stabl e output voltage of the dc/dc converter. the ramp wave circuit determines switching frequency. the frequ ency is fixed 1.2mhz internally. clock pulses generated in this circuit are used to produce ramp waveforms needed for pw m operation, and to synchronize all the internal circuits. the error amplifier is designed to monitor output voltage. t he amplifier compares the reference voltage with the feedback voltage. when a voltage lower than the reference voltage is fed back, the output volta ge of the error amplifier increases. the gain and frequency characteristics of the er ror amplifier output are fixed internally to deliver an optimized signal to the mix er. the error amplifier output signal optimized in the mixer is modulated with the current feedback signal. this signal is delivere d to the pwm comparator.
13/31 xc9246/XC9247 series operational explanation (continued) the current limit circuit monitors the cu rrent flowing through the n-ch mos driver transistor, and features a combination of the current limit mode and t he operation suspension mode. when the driver current is greater than a specific level, the current limit operates to turn off the pulses from the lx pin at any given timing. when the n-ch mos driver transistor is turned off, the limiter circuit is then released from t he current limit detection state . at the next pulse, the n-ch mos driver transistor is turned on. however, the n-ch mos trans istor is immediately turned off in the case of an over current state. when the over current state is eliminat ed, the ic resumes its normal operation. as ? to ? are repeated and an over-current state continues for about 20 s, the off period of the n-ch mos driver tr. will be longer to prevent from dc overlapping of the coil current. the over-current state continues for several ms. and as ? to ? are repeated, the off state of the n-ch mo s driver will be latched and ic will be stopp ed. once ic is in the state, operation c an be resumed by feeding h-level to en/ss pin after l-level is fed to the pin, or by turning the vin power off and turning it on again. under the function-stop state, clock is stopped, however it is not the shutdown state. so the internal circuitries opera te. the current limiting value is 2500ma typically. the latch time may be longer than spec., or the latch situation may not happen in sp ite of the over-current condition due to the ambient noise or the allocation of exte rnal components on pcb. putting the input capacitor to ic as close as possible is recommended. for protection against heat damag e of the ics, thermal shutdown function moni tors chip temperature. the thermal shutdown circuit starts operating and the n-ch mos driv er transistor will be turned off when the chip s temperature reaches 150 . when the temperature drops to 130 or less after shutting of the current flow, the ic performs the soft-start function to initiate output startup operation. when the v in voltage becomes 4.0v (xc9246b42 / XC9247b42) eit her 5.5v (9246b65 / XC9247b65) and 7.4v (9246b75 / XC9247b75) or lower, the n-ch mos driv er transistor is forced off to prevent false pulse output caused by unstable operation of the internal circuitry. when the v in voltage becomes 4.15v (typ.) either 5. 65v (typ.) and 7.65v (typ.) or higher, switching operation takes place. by releas ing the uvlo function, the ic performs the soft-start function to initiate output startup operation. the soft-start function operates even when the v in voltage falls momentarily below the uvlo detect voltage. the uvlo circuit does not cause a complete shutdown of the ic, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. an n-ch mos driver transistor is used in the hi gh side driver, so a voltage higher than the v in voltage is required in order to turned the driver on. therefor e, the boot strap method is used to gener ate a voltage that is higher than the v in voltage. the boot strap method is connecting the c bst capacitor between the bst-l x to cause the v lx to be lower than the v l (v l voltage = 4v), which is the internal power supply, so that the v l charges the c bst . charging the c bst requires more than a certain time when v lx is 0v or less. if the load current is below several ma, sufficient time to charge the c bst cannot be obtained, so oscillation might stop, but the product comp ulsorily increases the load current to provide stable operation even at light loads .
14/31 xc9246/XC9247 series operational explanation (continued) v out voltage is observed with the voltage at fb pin(hence fb voltage) and the voltage is produced by rfb1 and rfb2 which are connected between v out and gnd. and in the event that v out is shorted to gnd accidentally, the fb voltage drops to one half of the reference voltage or less, and if a current which is greater than i lim flows to the driver, the short-circuit protection is activated instantaneously and turns off the driver and the driver latches. once ic is in t he latch state, operation can be resumed by feeding h-level to en/ss pin after l-le vel is fed to the pin, or by turning the v in power off and turning it on again. in this case, v in should go down to lower voltage than uvlo detect voltage, and after that v in should go up to higher voltage than uvlo release voltage. (*1) in pfm control operation, until coil cu rrent reaches to a specified level (i pfm ), the ic keeps the n-ch mos driver transistor on. in this case, time that the n-ch mos driver transistor is kept on (t on ) can be given by the following formula. i pfm t on = l i pfm / (v in - v out ) < pfm duty limit > (*1) in the pfm control operation, the pfm duty limit (dty limit_pfm ) is set to 200% (typ.). ther efore, under the condition that the duty increases (e.g. the condition t hat the step-down ratio is small), it s possible for n-ch mos driver transistor to be turned off even when coil current does not reach to i pfm . i pfm (*1) xc9246 series excluded.
15/31 xc9246/XC9247 series note on use 1. for the phenomenon of temporal and transitional volt age decrease or voltage increase, the ic may be damaged or deteriorated if ic is used beyond the absolute max. specifications. 2. make sure that the absolute maximum ratings of t he external components and of this ic are not exceeded. 3. the dc/dc converter characteristics depend greatly on the externally connected components as well as on the characteristics of this ic, so refer to the specifications and standard circuit examples of each component when carefully considering which components to select. be especially carefu l of the capacitor characteristics and use b characteristics (jis standard) or x7r, x5r (eia standard) ceramic capacitors. 4. if there is a large dropout voltage, then a stable output voltage will not al ways be supplied under all conditions. please use it under the condition of v out /v in 100 R 18%. the operation might becom e unstable if used under 18%. 5. if there is a large dropout volt age, then there might be pulse-skip duri ng light loads even with pwm control. 6. the dc/dc converter of this ic uses a current-limiting circuit to monitor t he coil peak current. if the potential dropout voltage is large or the load current is la rge, the peak current will in crease, which makes it easier for current limitation to be applied which in turn could cause the operation to become unsta ble. when the peak current bec omes large, adjust the coil inductance and sufficiently check the operation. the following formula is used to show the peak current. ?????? peak current: ipk = ( v in ? v out ) onduty / ( 2 l f osc ) + i out l: coil inductance f osc : oscillation frequency ? 7. if an over-current (peak current) that exceeds the current limitation flows for a set time, n-ch mos driver transistor is turned off (integral latch circuit). the current limited porti on of the current will flow during the time from when the over-current is detected until n-ch mo s driver transistor is turned off, so be careful about the coil ratings. 8. if there is a large dropout voltage, a circuit delay coul d create the ramp-up of coil curr ent with staircase waveform exceeding the current limit. 9. when the over-current state continues for 20 s, the driver off time is lengthened to prevent superimposing of the coil current. the lengthened driver off time causes the v out to lower and thus triggering the short circuit protection without waiting for the integral latch time. 10. if a steep load change occurs , the voltage drop of the v out voltage is directly transmitted to the fb via the c fb , so the short circuit protection is triggered when the voltage is more than half the v out voltage. 11. the ripple current might rise during light loads. this is done to charge the c bst to ensure normal operation. although it depends on the input and output conditions, this c an be improved by pulling a load of several ma. 12. when using c l =22 f or above, also correspondingly increase the c bst capacitance. when not using the specified capacitance, the oscillation stops and the output voltage may become unstable. 2 cbst optimum settings 3 c l ( f) c bst ( f) c l Q 22 0.22 22 c l Q 47 0.47 47 c l Q 100 1.0 100 c l Q 220 2.2
16/31 xc9246/XC9247 series note on use (continued) 13. when the voltage difference betwe en input and output is small and the lo ad is light, the voltage between the bst-l x will lower and prevent driver on/off control, which could cause oscillation to stop and the output voltage to become unstable. use the specified input-output voltage range and set to the recommended coil inductance each. also use about 180pf for the capacitance between sbd terminals. using a large capacitance between terminals could cause oscillation stop. 2 recommended l value and v out range 3 v out recommended l value 1.2v Q v out Q 3.5v 3.3 h 4.7 h 3.5v v out Q 4.0v - 4.7 h 4.0v v out Q 5.6v - 6.8 h 14. when the input voltage is high and the load is light, the v out could rise above the set voltage. use the recommended coil inductance specified for each set voltage. also please use t he sbd which has inter-terminal capacitance of approx. 180pf and more. the over voltage situation may be caused at the output if t he sbd with smaller inter-terminal capacitance than 180pf is used. 15. when using the en/ss pin to switch between enable status and disable status, switch to the enable status after the v out voltage has become 1v or less. when switching to enable status when the v out is over 1v, sufficient voltage will not be applied between the bst-l x , which could cause oscillation stop and th e output voltage to become unstable. 16. if the voltage at the en/ss pin does not start from 0v but it is at the midpoint potential when the power is switched on, the soft start function may not work properly and it may cause the larger inrush current and bigger ripple voltages. 17. when using at an ambient temperature of -30 o c or less, use c l =47 f or higher. abnormal oscillation may occur at c l =22 f. 18. the ripple voltage could be increased when switching from discontinuous conduction mode to continuous conduction mode. 19. for the xc9246b42 and XC9247b42 , when the ic is operated under v in =5.0v, the efficiency may get lower significantly in the discontinuous conduction mode. 20. there is the possibility to get the ri pple voltage larger in case the peak current is unstable at the light current load i n pfm control operation. 21. torex places an importance on impr oving our products and their reliability. we request that users incorporate fail-safe designs and po st-aging protection treatment wh en using torex products in their systems.
17/31 xc9246/XC9247 series note on use (continued) the operation may become unstable due to noise and/or phase lag from the output curre nt 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. 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 v in and gnd pins. (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 c onnecting traces to reduce the circuit impeda nce. (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) please note that internal driver transistors bring on heat because of the load current and on resistance of the n-ch mos dr iver transistors.
18/31 xc9246/XC9247 series note on use (continued) pcb mounted (sot-26w) pcb mounted (usp-6c) 0 0 0 0 0 0
19/31 xc9246/XC9247 series typical performance characteristics (1) efficiency vs. output current (2) output voltage vs. output current xc9246b42/XC9247b42 (v out =1.8v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current :i out (ma) efficiency :effi(%) xc9246@vin=5v XC9247@vin=5v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b65/XC9247b65 (v out =3.3v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current :i out (ma) efficiency :effi(%) xc9246@vin=7.4v XC9247@vin=7.4v l=4.7 f(vlp4045lt-4r7m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b75/XC9247b75 (v out =3.3v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current :i out (ma) efficiency :effi(%) xc9246@vin=12v XC9247@vin=12v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b75/XC9247b75 (v out =5.0v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current :i out (ma) efficiency :effi(%) xc9246@vin=12v XC9247@vin=12v l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b42/XC9247b42 (v out =1.8v) 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 1 10 100 1000 output current :i out (ma) output voltage : v out (v) xc9246@vin=5v XC9247@vin=5v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc924 xc924 xc9246b65/XC9247b65 (v out =3.3v) 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 1 10 100 1000 output current :i out (ma) output voltage : v out (v) xc9246@vin=7.4v XC9247@vin=7.4v l=4.7 f(vlp4045lt-4r7m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246 XC9247
20/31 xc9246/XC9247 series typical performance characteristics (continued) (2) output voltage vs. output current (continued) ( 3 ) ri pp le volta g e vs. out p ut current ( 4 ) fb volta g e vs. ambient temperature xc9246b/XC9247b 0.980 0.985 0.990 0.995 1.000 1.005 1.010 1.015 1.020 -50 -25 0 25 50 75 100 ambient temperature :ta() fb voltage :v fb (v) vin=4.5v vin=12v vin=16v xc9246b75/XC9247b75 (v out =3.3v) 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 1 10 100 1000 output current :i out (ma) output voltage : v out (v) xc9246@vin=12v XC9247@vin=12v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246 XC9247 xc9246b75/XC9247b75 (v out =5.0v) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 1 10 100 1000 output current :i out (ma) output voltage : v out (v) xc9246@vin=12v XC9247@vin=12v l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246 XC9247 xc9246b42/XC9247b42 (v out =1.8v) 0 20 40 60 80 0.1 1 10 100 1000 output current :i out (ma) ripple voltage :vr(mv) xc9246@vin=5v XC9247@vin=5v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b75/XC9247b75 (v out =5.0v) 0 20 40 60 80 0.1 1 10 100 1000 output current :i out (ma) ripple voltage :vr(mv) xc9246@vin=12v XC9247@vin=12v l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b75/XC9247b75 (v out =3.3v) 0 20 40 60 80 0.1 1 10 100 1000 output current :i out (ma) ripple voltage :vr(mv) xc9246@vin=12v XC9247@vin=12v l=4.7 f(vlp4045lt-4r7m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg)
21/31 xc9246/XC9247 series typical performance characteristics (continued) (5) uvlo voltage vs. ambient temperature (6) oscillation frequency vs. ambient temperature (7) supply current vs. ambient temperature (8) stand-by current vs. ambient temperature xc9246b42/XC9247b42 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 -50 -25 0 25 50 75 100 ambient temperature :ta() uvlo voltage :v uvlo (v) release detection xc9246b/XC9247b 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 ambient temperature :ta() supply current :iq(ua) vin=4.5v vin=12v vin=16v xc9246b65/XC9247b65 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 -50 -25 0 25 50 75 100 ambient temperature :ta() uvlo voltage :v uvlo (v) release detection xc9246b75/XC9247b75 6.8 7.0 7.2 7.4 7.6 7.8 8.0 8.2 -50 -25 0 25 50 75 100 ambient temperature :ta() uvlo voltage :v uvlo (v) release detection xc9246b/XC9247b 0 2 4 6 8 10 12 14 16 -50 -25 0 25 50 75 100 ambient temperature :ta() stand-by current :i stb (ua) vin=4.5v vin=16v xc9246b 1020 1120 1220 1320 1420 -50 -25 0 25 50 75 100 ambient temperature :ta() oscillation frequency :fosc(khz) vin=4.5v vin=12v vin=16v
22/31 xc9246/XC9247 series typical performance characteristics (continued) (9) pfm switch current vs. output current ( 10 ) lx sw on resistance vs. ambient tem p erature ( 11 ) lx "l" current vs. ambient tem p erature (12) current limit vs. ambient temperature (13) fb voltage vs. en/ss voltage XC9247b (v out =3.3v) 0 200 400 600 800 1000 0 5 10 15 20 25 30 output current :i out (ma) pfm switch current :i pfm (ma) vin=7.0v vin=12v vin=16v l=4.7 f(vlp4045lt-4r7m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg) xc9246b/XC9247b -8 -7 -6 -5 -4 -3 -2 -1 -50 -25 0 25 50 75 100 ambient temperature :ta() lx "l" current :ilxl(ua) xc9246b/XC9247b 1000 1500 2000 2500 3000 3500 4000 -50 -25 0 25 50 75 100 ambient temperature :ta() current limit :i lim (ma) vin=4.5v vin=5.5v vin=16v xc9246b/XC9247b 0.0 0.2 0.4 0.6 0.8 1.0 1.2 012345 en/ss voltage :v en/ss (v) fb voltage :v fb (v) ta=-40 ta=25 ta=85 xc9246b/XC9247b 0.1 0.2 0.3 0.4 0.5 -50 -25 0 25 50 75 100 ambient temperature :ta() lx sw on resistance :r lx () XC9247b (v out =5.0v) 0 200 400 600 800 1000 0 5 10 15 20 25 30 output current :i out (ma) pfm switch current :i pfm (ma) vin=8.0v vin=12v vin=16v l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), c l =10 f2(lmk212abj106kg)
23/31 xc9246/XC9247 series typical performance characteristics (continued) (14) internal soft-start time vs. am bient temperature (15) external soft- start time vs. ambient temperature xc9246b/XC9247b (v out =5.0v) 0.5 1.0 1.5 2.0 2.5 3.0 -50 -25 0 25 50 75 100 ambient temperature :ta() internal soft-start time :t ss1 (ms) vin=8.0v vin=12v vin=16v vin=16v,12v,8v xc9246b/XC9247b (v out =5v) 15 20 25 30 35 40 -50 -25 0 25 50 75 100 ambient temperature :ta() external soft-start time :t ss2 (ma) vin=8.0v vin=12v vin=16v vin=16v,12v,8v
24/31 xc9246/XC9247 series typical performance characteristics (continued) (16) load transient response v in =12v, v out =3.3v, i out =10ma200ma v in =12v, v out =3.3v, i out =200ma10ma v in =12v, v out =3.3v, i out =10ma500ma v in =12v, v out =3.3v, i out =500ma10ma v in =12v, v out =3.3v, i out =200ma800ma v in =12v, v out =3.3v, i out =800ma200ma xc9246b xc9246b xc9246b xc9246b xc9246b xc9246b v out : 50mv/div i out =10ma 200ma 50 s/div v out : 50mv/div i out =200ma 10ma 50 s/div l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) v out : 50mv/div i out =10ma 500ma 50 s/div v out : 50mv/div i out =200ma 800ma 50 s/div v out : 50mv/div i out =500ma 10ma 100 s/div v out : 50mv/div i out =800ma 200ma 50 s/div l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg)
25/31 xc9246/XC9247 series typical performance characteristics (continued) (16) load transient response (continued) v in =12v, v out =3.3v, i out =10ma200ma v in =12v, v out =3.3v, i out =200ma10ma v in =12v, v out =3.3v, i out =10ma500ma v in =12v, v out =3.3v, i out =500ma10ma v in =12v, v out =3.3v, i out =200ma800ma v in =12v, v out =3.3v, i out =800ma200ma XC9247b XC9247b XC9247b XC9247b XC9247b XC9247b v out : 50mv/div i out =10ma 200ma 50 s/div v out : 50mv/div i out =200ma 10ma 100 s/div v out : 100mv/div i out =10ma 500ma 50 s/div v out : 50mv/div i out =200ma 800ma 50 s/div v out : 100mv/div i out =500ma 10ma 100 s/div v out : 50mv/div i out =800ma 200ma 50 s/div l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=4.7 f(xfl4020-472meb), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg)
26/31 xc9246/XC9247 series typical performance characteristics (continued) (16) load transient response (continued) vin=12v, vout=5.0v, iout=10ma200ma vin=12v, vout=5.0v, iout=200 ma10ma vin=12v, vout=5.0v, iout=10ma500ma vin=12v, vout=5.0v, iout=500 ma10ma vin=12v, vout=5.0v, iout=200ma800ma vin=12v, vout=5.0v, iout=80 0ma200ma xc9246b xc9246b xc9246b xc9246b xc9246b xc9246b v out : 50mv/div i out =10ma 200ma 50 s/div v out : 100mv/div i out =200ma 10ma 100 s/div l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) v out : 100mv/div i out =10ma 500ma 50 s/div v out : 100mv/div i out =500ma 10ma 100 s/div v out : 50mv/div i out =200ma 800ma 50 s/div v out : 50mv/div i out =800ma 200ma 50 s/div l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd=xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg)
27/31 xc9246/XC9247 series typical performance characteristics (continued) (16) load transient response (continued) vin=12v, vout=5.0v, iout=10ma200ma vin=12v, vout=5.0v, iout=200 ma10ma vin=12v, vout=5.0v, iout=10ma500ma vin=12v, vout=5.0v, iout=500 ma10ma vin=12v, vout=5.0v, iout=200ma800ma vin=12v, vout=5.0v, iout=80 0ma200ma XC9247b XC9247b XC9247b XC9247b XC9247b XC9247b v out : 100mv/div i out =10ma 200ma 50 s/div v out : 100mv/div i out =200ma 10ma 100 s/div l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) v out : 100mv/div i out =10ma 500ma 50 s/div v out : 100mv/div i out =500ma 10ma 100 s/div v out : 50mv/div i out =200ma 800ma 50 s/div v out : 50mv/div i out =800ma 200ma 50 s/div l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg) l=6.8 f(vlp4045lt-6r8m), sbd= xbs204s17r c in =10 f(tmk316bj106kl), cl=10 f2(lmk212abj106kg)
28/31 xc9246/XC9247 series 1.80.05 2.00.05 0.6max 0.250.05 (0.50) 1.00.05 (0.1) 1.40.05 0.200.05 0.300.05 0.100.05 0.700.05 ?705 ? packaging information ? sot-26w (unit: mm) ? usp-6c (unit: mm)
29/31 xc9246/XC9247 series 2.4 2 3 4 5 6 1 0.45 1.0 0.05 0.05 2 34 5 6 1 usp-6c ?`? usp-6c ??? 0.45 0.35 2.3 0.35 0.8 0.15 0.15 packaging information (continued) ? usp-6c reference pattern layout (unit: mm) ? usp-6c reference metal mask design (unit: mm)
30/31 xc9246/XC9247 series marking rule represents products series represents products type ? 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 ? represents products type ? 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. mark product series 6 xc9246b*****-g 7 XC9247b*****-g mark type product series 4 uvlo voltage=4.15v xc9246b42***-g XC9247b42***-g 6 uvlo voltage=5.65v xc9246b65***-g XC9247b65***-g 7 uvlo voltage=7.65v xc9246b75***-g XC9247b75***-g mark product series 6 xc9246b*****-g 7 XC9247b*****-g mark type product series 4 2 uvlo voltage=4.15v xc9246b42***-g XC9247b42***-g 6 5 uvlo voltage=5.65v xc9246b65***-g XC9247b65***-g 7 5 uvlo voltage=7.65v xc9246b75***-g XC9247b75***-g 1 2 3 6 5 4 usp-6c 123 64 sot-26w 5
31/31 xc9246/XC9247 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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