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1/21 xc9248 series 18v driver transistor built-in sync hronous step-down dc/dc converter ? general description the xc9248 series is 18v bootstrap synchronous step-down dc/dc converter with built-in nch-nch driver transistors. with an input voltage range from 4.5v to 18v and a maximum out put current of 2.2a, the series is suitable for digital home appliance power supplies and can be used with small ceramic capacitors. the series has a 0.8v reference voltage, and using externally connected resistors, the output voltage can be set freely from 1.0v to 12v. the control method is synchronous pwm (source/ sink). the soft start time is internally set to 2.8ms (typ.), also can be adjusted using external capacitor. with uvlo (under voltage lock out) function, the internal dr iver transistors are forced off when input voltage falls down below 3.8v (typ.). the series includes over current protection, v out short-circuit protection, lx short-circuit protection, v out overvoltage protection and thermal shutdown. applications ? digital home appliance ? office automation equipment ? notebook computers ? car accessories power supplies typical application circuit etr05022-004 features input voltage 4.5v 18v output voltage 1.0v 12v (v fb =0.8v1.5%) (*1) output current 2.2a efficiency 93.8% (*1) @v in =12v,v out =5v, i out =700ma oscillation frequency 500khz maximum duty cycle 79% soft-start time fixed2.8ms, set by external capacitor protection circuit uvlo high side over current protection low side over current protection v out short-circuit protection l x short-circuit protection v out over voltage protection thermal shutdown package sop-8fd environmentally friendly eu rohs compliant, pb free (*1) performance depends on external components and wiring on the pcb. efficiency vs. output current typical performance characteristics l v out v in en c ss c in c bst c vl c l c fb r fb1 r fb2 v in en ss fb l x gnd bst v l ta=25c 0 10 20 30 40 50 60 70 80 90 100 0 500 1000 1500 2000 output current : i out [ma] efficiency [%] v in =12v , v out =3.3v v in =12v , v out =5v
2/21 xc9248 series block diagram * internal diodes include an esd pr otection diode and a parasitic diode. product classification ? ordering information xc9248 ?????- (*1) the ?-g? suffix denotes halogen and antimony free as well as being fully rohs compliant. selection guide (*1) the over-current protection latc h is an integral latch type. (*2) to prevent an extremely large rush current from flowing in th e event that lx is short-circui ted, both the a & b types have an lx short protection latch function. designator item symbol description a type b refer to selection guide ? fb voltage 08 fb voltage is fixed in 0.8v oscillation frequency 5 500khz ? - (*1) package qr-g sop-8fd (1,000/reel) type current limiter latch for current limiter latch for v out -short latch for l x -short (*2) a yes yes (*1) yes yes b yes no no yes type enable uvlo c l auto-discharge thermal shutdown a yes yes yes yes b yes yes yes yes
3/21 xc9248 series pin configuration ???????????????????????? pin configuration function (*1) on the xc9248 series, causes unspec ified behavior and thus is prohibited. pin number pin name functions 1 v in power input 2 en enable 3 ss external soft-start 4 fb fb voltage monitor 5 v l internal regulator output 6 bst pre driver supply 7 gnd ground 8 l x switching output pin name signal status l stand-by h active en open undefined state (*1) * the dissipation pad for the sop-8fd package should be solder-p lated 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.7) pin. sop-8fd (top view) v in 1 en 2 ss 3 fb 4 8 l x 7 gnd 6 bst 5 v l
4/21 xc9248 series absolute maximum ratings ta = 2 5 ? parameter symbol ratings units v in pin voltage v in -0.3 +20 v en pin voltage v en -0.3 +20 v l x pin voltage v lx -0.3 v in +0.3 or +20 (*1) v bst pin voltage v bst v l -0.3 v l +20 v lx -0.3 v lx +5.5 v v l pin voltage v vl -0.3 v in +0.3 or +5.5 (*2) v fb pin voltage v fb -0.3 +5.5 v ss pin voltage v ss -0.3 +5.5 v l x pin current i lx 5 a v l pin current i vl 85 ma power dissipation pd 300 mw operating ambient temperature topr -40 +105 c storage temperature tstg -50 +125 c all voltages are described based on the ground voltage. (*1) the maximum value should be either v in +0.3 or +20v in the lowest. (*1) the maximum value should be either v in +0.3 or +5.5v in the lowest.
5/21 xc9248 series electrical characteristics xc9248 series ta=25 ? parameter symbol conditions min. typ. max. units circuit operating voltage range v in when connected to external components v in Q 7v: setup v out =3.3v v in >7v: setup v out =5v 4.5 - 18 v fb voltage v fb v fb =sweep (0.812v 0.788v), v ss =open 0.788 0.800 0.812 v fb voltage temperature characteristics vfb/ (vfb ? topr) -40 Q topr Q 105 40 ppm/ maximum output current i outmax when connected to external components 2.2 (*1) - - a supply current i q v in =v en =18v, v fb =0.9v - 0.76 1.10 ma stand-by current i stb v in =18v, v en =0v, v fb =open - 38 51 a ? oscillation frequency f osc v fb =0.7v, v ss =open 450 500 550 khz maximum duty cycle d max v fb =0.7v, v ss =open 74 79 - % uvlo detection voltage v uvlod v in =sweep (4.5v 3.5v) , v en =2v, v fb =0.9v voltage when v l pin changes from ?h? level to ?l? level (*2) 3.50 3.80 4.45 v uvlo release voltage v uvlor v in =sweep (3.5v 4.5v), v en =2v, v fb =0.9v voltage when v l pin changes from ?l? level to ?h? level (*2) 3.55 3.90 4.50 v low side current limit i limls v out =4.5v (forced), bottom point of l x pin current 2.1 - - a integral latch time (type a) t lat v fb =0.9v, i lx = i limls time until ss pin changes from ?h? level to ?l? level (*2) 0.4 1.1 1.8 ms internal soft-start time t ss v in =12v, v en =2v, v fb =0.72v, v ss =open time until l x pin oscillates - 2.8 - ms ss terminal current i ss v ss =0v, v lx =v fb =open 2 4 6 a ? ss threshold voltage v ssth v fb =0.72v, v ss =open voltage when l x pin oscillates 1.2 1.8 2.4 v ovp detection voltage v ovpd v fb =sweep (0.788v 1.2v), v ss =open - 0.9 1.2 v efficiency effi (*3) setup v out =5v, i out =0.7a when connected to external components - 93.8 - % lx sw ?h? on resistance r lxh - 0.12 (*4) - ? - lx sw ?l? on resistance r lxl - 0.12 (*4) - ? - en ?h? voltage v enh v in =12v, v fb =0.9v, v en =sweep (0.2v 1.4v) voltage when v l pin changes from ?l? level to ?h? level (*2) 1.4 - - v en ?l? voltage v enl v in =12v, v fb =0.9v, v en =sweep (1.4v 0.2v) voltage when v l pin changes from ?h? level to ?l? level (*2) - - 0.2 v lx ?l? current i lxl v in =18v , v en =v lx =0v , v fb =v ss =open -1 0 - a ?? en ?h? current i enh v in =v en =18v , v lx =v fb =v ss =open - 16 21 a ?? en ?l? current i enl v in =18v , v en =0v , v lx =v fb =v ss =open -0.1 - 0.1 a ?? fb ?h? current i fbh v in =18v , v en =0v , v fb =5v , v lx =v ss =open -0.1 - 0.1 a ?? fb ?l? current i fbl v in =18v , v en =v fb =0v , v lx =v ss =open -0.1 - 0.1 a ?? thermal shutdown temperature t tsd ? - 150 - c - hysteresis width t hys ? - 25 - c - c l discharge resistance r dchg v in =12v , v en =0v , v lx =2v , v fb =v ss =open - 300 -
? c l discharge current i dchg v in =12v , v en =0v , v lx =12v , v fb =v ss =open - 9 - ma ? unless otherwise stated, v in =v en =12v (*1) mount conditions affect heat dissipation. maximum output current is not guaranteed when thermal shutdown starts to operate ear lier. (*2) ?h?=4.3v 5v, ?l?= 0.1v 0.1v (*3) effi = {[(output voltage)(output current)][(input voltage)(input current)]}100 (*4) design value
6/21 xc9248 series test circuits circuit circuit circuit circuit circuit circuit circuit circuit v in gnd en l x bst fb v l ss c bst l c l c vl c in c in : 10f 2parallel(ceramic) c vl : 0.1f(ceramic) c bst : 0.1f(ceramic) c l : 22f 2parallel(ceramic) c fb r fb1 r fb2 l : 6.8h r fb1 : 43k r fb2 : 8.2k c fb : 470pf v out wave form measurement point (current probe)
7/21 xc9248 series typical application circuit ? ? ? ? ? ? ? ? ? ? ? ? ? typical examples manufacturer part number value tdk clf10040t100n 10 h tdk clf7045t6r8n 6.8 h taiyo yuden nr6045t4r5m 4.5 h l taiyo yuden nr6028t2r2n 2.2 h c2012x5r1e106k 10 f/25v 2parallel c in (*1) tdk c3216x7r1e106k 10 f/25v 2parallel C2012X5R1A226M 22 f/10v 2parallel c3216x5r1e226m 22 f/25v 2parallel c3225x7r1c226m 22 f/16v 2parallel c l (*1) tdk c4532x7r1e226m 22 f/25v 2parallel c ss 0.1 f (*2) /10v c bst 0.1 f/10v c vl 0.1 f/10v (*1) select components appropriate to the usage conditions (ambient temperature, input & output voltage). (*2) for the coil capacitance value, please refer to p.8 < external soft-start setting >. for stable operation by current feedback control, the xc9248 seri es is optimum when the peak-to- peak current (ipk) in the coil is set approximately between 0.5a to 1a. the ipk value can be calculated by using the following equation: ipk[a] = (v in v out ) v out / v in / 0.5 / l[ h] ? l : coil inductance ? examples v in [v] v out [v] l[ h] ipk[a] 5.0 1.0 2.2 0.73 5.0 2.5 3.3 0.76 12.0 3.3 6.8 0.70 12.0 5.0 6.8 0.86 18.0 5.0 10.0 0.72 18.0 12.0 10.0 0.80
8/21 xc9248 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 150k ? . output voltage range can be set freely from 1.0v to 12v with a 0.8v reference voltage. ? v out =0.8(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 7khz. adjustments are required from 5khz to 50khz depending on t he application, value of inductance (l), and value of load capacitance (c l ). ? examples r fb1 =47k ? , r fb2 =15k ? , v out =0.8v(47k ? +15k ? ) /15k ? =3.3v c fb =470pf, fzfb=1/(2 470pf47k ? )=7.2khz ? < minimum v out > the minimum v out is set by minduty. the minduty changes by the external inductance(l). for the l value, please choose the optimal value ? see p.7 . the minimum v out can be calculated by using the following equation: v out = v in minduty / 100 l vs. minduty l[ h] minduty[%] 2.2 18 3.3 20 4.7 21 6.8 21 10 22 a capacitor can be connected to the ss pin to set a time lo nger than the internal soft-start time voluntarily. by setting the en pin to the v enh voltage or higher, a current i ss =4 a (typ.) flows to the ss pin and charges the capacitor. when the ss pin voltage attains the ss threshold voltage v ssth =1.8v (typ.), the output voltage reaches about 90% of the set voltage. external soft-start can be calculated by using the following equation: ? external soft-start time=v ssth c ss / i ss examples c ss =0.1 f, external soft-start time=1.8v 0.1 f / 4 a 1000=45ms ? ? ? ? ? ? ? ? ? ? ? ? ? ? c ss external soft-start time 0.01 f 0.047 f 0.1 f 0.47 f 1 f 4.7 f 4.5ms 20ms 45ms 200ms 450ms 2000ms
9/21 xc9248 series operational explanation ? the xc9248 series consists of a reference voltage source, an internal reference voltage source, ramp wave circuit, error amplifier, pwm comparator, phase compensation circuit, nch mo s driver transistor, current limiter circuit, uvlo, short protection circuit, thermal shutdown circuit, over volt age protection and others. (see the block diagram below.) by using the error amplifier, the fb pin voltage is compared with the internal reference voltage. the signal is input into the pwm comparator to determine the on time of switching. the si gnal from the error amplifier is compared with the ramp wave from the ramp wave circuit, and the result ing output is delivered to t he output buffer circuit to pr ovide on-time of the duty c ycle at the lx pin. this process is continuously performed to ensure stable output voltage. the current feedback circuit monitors the nch mos driver tr ansistor current for each switch ing 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. ? xc9248 series ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? the reference voltage source provides the reference voltage to ensure stable output volt age of the dc/dc converter. the ramp wave circuit determines switching frequency. the fr equency is fixed 500khz 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 monito r output voltage. the amplifier compares the reference voltage with the feedback voltage. when a voltage lower than the refer ence voltage is fed back, t he output voltage of the error amplifier increases. the gain and frequency characteristics of the erro r 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. ? ? ? ? ? ? ? ? ?
10/21 xc9248 series operational explanation (continued) ? the current limiting circuit of the xc9248 series monitors the current that flows through the low side and high side nch mos driver tr, and when over-current is detecte d, the current limiting function activates. low side driver current limiting the current in the low side driver tr . is detected to equivalently monitor the bottom value of the coil current. the low side driver current limiting function prohibits the high side driver tr. from turning on in an over-current state where the bottom value of the coil current is higher than the low side driver current limit value i limls . control to lower the switching frequency f osc is also performed. when the over-curre nt state is released, normal operation resumes. high side driver current limiting + low side driver current limiting the current in the high side driver tr. is detected to equivalently monitor the peak value of the coil current. the high side driver current limiting function forcibly turns off the high side driver tr. when the peak value of the coil curr ent reaches the high side driver current limit value i limhs . i limls < i limhs is set inside the ic, and theref ore the low side driver current limiting function of above also detects the over-current state at this ti me. when the over-current state is released, normal operation resumes. over-current latch (type a) type a turns off the high side and low side driver transistors when state or continues for 1.1 ms (typ.). the l x pin is in the c l discharged state, and is latch- stopped at the gnd level (0v). the latch-stopped state only stop s the pulse output from the l x pin; the internal circuitry of the ic continues to operate. to restart after latch-stopping, l level and then h level must be input into the en pin, or v in pin re-input must be performed (after lowering the voltage below the uvlo detection voltage) to resume operation by soft start. the over-current latch function may occasionally be released fr om the current limit detection st ate by the effects of ambient noise, and it may also happen that the latch time becomes longer or latching does not take place due to board conditions. for this reason, place the input capacitor as close as possible to the ic. type b is an automatic recovery type that performs the operation of or until the over-current state is released. low side driver current limit value i limls =2.1a (min.) high side driver current limit value i limhs =4.1a (typ.) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
11/21 xc9248 series operational explanation (continued) ? for protection against heat damage of the ics, thermal shutdown function moni tors chip temperature. the thermal shutdown circuit starts operating and the nch mos driver transistor will be turned off when the chip s temperature reaches 150 . the l x pin enters the c l discharged state and stops func tioning at gnd level (0v). when the temperature drops to 125 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 3.8v (typ.) or lower, the nc h mos driver transistor is forced off. the l x pin enters the c l discharged state and stops functionin g at gnd level (0v). when the v in voltage becomes 3.9v (typ.) or higher, switching operation takes place. by releasing the uvlo function, the ic performs the soft-start function to initiate output startup opera tion. the soft-start function operates even when the v in voltage falls momentarily below the uv lo detect voltage. the uvlo circuit does not cause a complete shutdown of t he ic, but causes pulse output to be sus pended; therefore, the internal circuitry remains in operation. ? an nch mos driver tr. is used for the hi gh side driver, and a voltage higher than the v in voltage is needed to turn the driver on. for that purpose, the bootstr ap method is used to generate a voltage higher than the v in voltage. the c bst capacitance is connected between bst and lx, and because the v lx voltage is lower than the 4.6v (typ.) v l voltage that is the internal power supply, c bst is charged from v l . with the a type, when the output voltage v out is shorted to gnd or is near a shorted state (the fb voltage is1/2 or lower), and a current over the current limit flows to the high side or low side driver tr., a v out short circuit is detected and the high side and low side driver trs. are immediately turned off and latched. the l x pin enters the c l discharged state and stops functioning at gnd level (0v). once in the latched state, operation is resumed by either turning t he ic off and restarting with the en pin, or by re-input into the v in pin (the voltage is lowered below the under-voltage lockout detection voltage once). if the event that the l x pin shorts to gnd, l x short-circuit protection activates for pr otection from over-current due to rush current and to protect the ic. if the l x pin shorts to gnd, high side current limiting will activate due to rush current when the high side driver tr. turns on. the high side driver tr. turn offs, and the low side driver tr. tu rns on at the same time. at this time, if low side current li miting did not activate, an l x short-circuit is detected, and the low side driver is turned off and la tched at the same time as the high side driver tr. once in the latched state, operation is resumed by either turning the ic off and restarting with the en pin, or by re-input into the v in pin (the voltage is lowered below the under-voltage lockout detection voltage once). to minimize output voltage overshoot, v out over-voltage protection activates when v out overshoot occurs due to the output resistance changing from a heavy load to a light load or otherwise. when v out overshoot occurs and the fb voltage that senses v out rises to 0.9v (typ.) or more, the high side driver tr. is i mmediately turned off and the low side driver tr. is turned on to prevent v out overshoot. when the fb voltage falls to 0.8v (typ.) or le ss due to hysteresis, the high side driver tr. turns on at the next clock cycle. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
12/21 xc9248 series operational explanation (continued) ? when l level is input into the en pin and the ic enter s the standby state, the char ge on the output capacitor c l can be discharged at high speed with the nch mos switch tr. incorporated between l x and gnd. this enables the prevention of application malfunctioning due to c l charge remaining when the ic stops. the c l discharge time can be calculated from the equation below. note that the equation varies depending on the set voltage v out(e) . (1) equation when the set voltage v out(e) is 1v to 4v. the c l discharge time is determined by c l and r dchg . if the time constant of c l and r dchg is ( = c l r dchg ), the output voltage discharge time can be calculat ed by using the following equation: ? 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 ? ? (2) equation when the set voltage v out(e) is 4.1v to 12v. the c l discharge time is determined by constant current until v out(e) is 4 v. when 4v or less, it is determined by c l and r dchg as in (1). if ( = c l r dchg ) is the time constant of c l and r dchg and the c l discharge current is i dchg , the discharge time of the output voltage can be calculated by using the following equation: t = ln ( 4 / v ) + c l (v out(e) - 4) / i dchg v : output voltage after discharge v out(e) : output voltage, t: discharge time : c l r dchg i dchg : c l : discharge time ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
13/21 xc9248 series note on use 1. for temporary, transitional voltage drop or voltage rising phenomen on, the ic is liable to malfunction should the ratings be exceeded. 2. the dc/dc converter characteristics depend greatly on t he externally connected components as well as on the characteristics of this ic, so refer to the specifications and typical standard circuit examples of each component when carefully considering which components to select. be espec ially careful of the capacitor characteristics and use b characteristics (jis standard) or x7r, x5r (eia standard) ceramic capacitors. 3. where wiring impedance is high, operat ions may become unstable 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. ? 4. this ic monitors peak to peak current in the coil by mean s of a low side driver current limiting circuit and a high side dri ver current limiting circuit. the peak to peak current varies depending on the difference between the input voltage and the output voltage as well as the l value of the coil and thus, in some cases, current limiting may activate too frequently and cause operation to become unstable or the curr ent may not reach the maximum output current. 5. with the a type, when a shar p load fluctuation occurs, the v out voltage drop is conveyed directly to the fb pin through c fb , and short-circuit protection may activate at a voltage higher than 1/2 the v out voltage. 6. the v l pin is the output of the internal regulator for operat ion of the dc/dc control block. for stable operation, always connect an external capacitor c vl to the v l pin. do not use the v l pin for external power supply, as it has been optimized as a local power supply. 7. with this ic, operation may become unstabl e at the minimum operating voltage or less. 8. make sure that the absolute maxi mum ratings of the external components and of this ic are not exceeded. 9. torex places an importance on improvi ng our products and their reliability. we request that users incorporate fail-safe designs and post-aging protec tion treatment when using torex products in their systems. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
14/21 xc9248 series note on use (continued) ? 10. instructions for 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) internal driver transistors bring on heat because of the output current (i out ) and on resistance of the nch mos driver transistors. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? pcb mounted ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1 s t layer 2 n d layer
15/21 xc9248 series typical performance characteristics (1) efficiency vs. output current (2) output voltage vs. output currnt xc9248(v in =12v , v out =3.3v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 output current :i out [ma] efficiency :effi[%] l=6.8 f(clf7045t6r8n) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) xc9248(v in =12v , v out =5v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 output current :i out [ma] efficiency :effi[%] l=6.8 f(clf7045t6r8n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =9v , v out =4v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 output current :i out [ma] efficiency :effi[%] l=4.5 f(nr6045t4r5m) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =12v , v out =3.3v) 3.20 3.22 3.24 3.26 3.28 3.30 3.32 3.34 3.36 3.38 3.40 1 10 100 1000 10000 output current :i out [ma] output voltage : v out [v] l=6.8 f(clf7045t6r8n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =12v , v out =5v) 4.90 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 1 10 100 1000 10000 output current :i out [ma] output voltage : v out [v] l=6.8 f(clf7045t6r8n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =9v , v out =4v) 3.90 3.92 3.94 3.96 3.98 4.00 4.02 4.04 4.06 4.08 4.10 1 10 100 1000 10000 output current :i out [ma] output voltage : v out [v] l=4.5 f(nr6045t4r5m) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =5v , v out =1v) 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 output current :i out [ma] efficiency :effi[%] l=2.2 f(nr6028t2r2n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(v in =5v , v out =1v) 0.90 0.92 0.94 0.96 0.98 1.00 1.02 1.04 1.06 1.08 1.10 1 10 100 1000 10000 output current :i out [ma] output voltage : v out [v] l=2.2 f(nr6028t2r2n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k)
16/21 xc9248 series typical performance characteristics (continued) (3) ripple voltage vs. output current (4) fb voltage vs. ambient temperature (5) uvlo voltage vs. ambient temperature (6) oscillation frequency vs. ambient temperature (7) supply cu rrent vs. ambient temperature xc9248 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] uvlo voltage :v uvlod ,v uvlor [v] detection release xc9248 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] supply current :iq[ma] vin=4.5v vin=12v vin=18v xc9248 450 460 470 480 490 500 510 520 530 540 550 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] oscillation frequency :fosc[khz] vin=4.5v vin=12v vin=18v xc9248(v in =12v , v out =3.3v) 0 2 4 6 8 10 1 10 100 1000 10000 output current :i out [ma] ripple voltage :vr[mv] l=6.8 f(clf7045t6r8n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248 0.788 0.790 0.792 0.794 0.796 0.798 0.800 0.802 0.804 0.806 0.808 0.810 0.812 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] fb voltage :vfb[v] vin=4.5v vin=12v vin=18v xc9248(v in =12v , v out =5v) 0 2 4 6 8 10 1 10 100 1000 10000 output current :i out [ma] ripple voltage :vr[mv] l=6.8 f(clf7045t6r8n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(vin=9v , vout=4v) 0 2 4 6 8 10 1 10 100 1000 10000 output current :i out [ma] ripple voltage :vr[mv] l=4.5 f(nr6045t4r5m) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k) xc9248(vin=5v , vout=1v) 0 2 4 6 8 10 1 10 100 1000 10000 output current :i out [ma] ripple voltage :vr[mv] l=2.2 f(nr6028t2r2n) c in =10 f2(c2012x5r1e106k), c l =22 f2(c2012x5r1a226k)
17/21 xc9248 series typical performance characteristics (continued) (8) stand-by current vs. ambient temperature (9) lx sw"l" on res istance vs. ambient temperature (10) lx "l" current vs. ambient temperature (11) en "h" current vs. ambient temperature (12) en "h" voltage vs. ambient temperature (13) en "l" voltage vs. ambient temperature (14) internal soft-start time vs. ambient temperature (15) ss te rminal current vs. ambient temperature xc9248 0 5 10 15 20 25 30 35 40 45 -50-250 255075100125 ambient temperature :ta[] stand-by current :i stb [a] vin=4.5v vin=12v vin=18v xc9248 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] lx "l" current :i lxl [a] vin=4.5v vin=12v vin=18v xc9248 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] internal soft-start time :t ss [ms] vin=4.5v vin=12v vin=18v xc9248 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] lx sw"l" on resistance :r lxl [] vin=4.5v vin=12v vin=18v xc9248 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[] en "h" voltage :v enh [v] vin=4.5v vin=12v vin=18v xc9248 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[] en "l" voltage :v enl [v] vin=4.5v vin=12v vin=18v xc9248 0 5 10 15 20 25 30 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] en "h" current :i enh [a] vin=4.5v vin=12v vin=18v xc9248 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] ss terminal current :i ss [a] vin=4.5v vin=12v vin=18v
18/21 xc9248 series typical performance characteristics (continued) (16) ss threshold voltage vs. ambient temperature (17) load transient response v in =12v, v out =3.3v, i out =no load1000ma v in =12v, v out =3.3v, i out =1000mano load v in =9v, v out =4v, i out =no load1000ma v in =9v, v out =4v, i out =1000mano load v in =5v, v out =1v, i out =no load1000ma v in =5v, v out =1v, i out =1000mano load xc9248 xc9248 xc9248 xc9248 xc9248 xc9248 v out : 500mv/div i out =no load 1000ma 50 no load l=6.8 f(clf7045t6r8n) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) l=6.8 f(clf7045t6r8n) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) l=4.5 f(nr6045t4r5m) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) l=4.5 f(nr6045t4r5m) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) l=2.2 f(nr6028t2r2n) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) l=2.2 f(nr6028t2r2n) c in =10 f 2(c2012x5r1e106k), c l =22 f 2(c2012x5r1a226k) xc9248 1.2 1.4 1.6 1.8 2.0 2.2 2.4 -50 -25 0 25 50 75 100 125 ambient temperature :ta[] ss threshold voltage :v ssth [v] vin=4.5v vin=12v vin=18v v out : 500mv/div i out =no load 1000ma 50 no load v out : 500mv/div i out =no load 1000ma 50 no load
19/21 xc9248 series packaging information ? ? sop-8fd (unit: mm) ? ? ? ? ? ? ? ? ? ? sop-8fd ? reference pattern layout (unit: mm) ????????? sop-8fd ? reference metal mask design (unit: mm) 4.90.1 0.220.03 (1.27 0.420.09 0.1 bottom view (3.3) 2.4 1.62 4.88 4.88 2.3 1.52
20/21 xc9248 series marking rule represents products series represents products type represents fb voltage and oscillation frequency ? 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 b xc9248******-g mark product series a xc9248a*****-g b xc9248b*****-g mark voltage (v) oscillation frequency product series 5 0.8 500khz xc9248*085**-g 1 23 4 8 7 6 5 sop-8fd
21/21 xc9248 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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