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? 2015 exar corporation XR76203/5/8 40v powerblox tm 3a/5a/8a synchronous step down cot regulator exar.com/XR76203/5/8 rev 1a 1 / 20 general description the XR76203, xr76205 and xr76208 are synchronous step-down regu- lators combining the controller, drivers, bootstrap diode and mosfets in a single package for point-of-load supplies. the XR76203, xr76205 and xr76208 have load current ratings of 3a, 5a and 8a respectively. a wide 5v to 40v input voltage range allows for single supply operation from industry standard 24v 10%, 18v-36v, and rectified 18vac and 24vac rails. with a proprietary emulated current mode constant on-time (cot) con- trol scheme, the XR76203, xr76205 and xr76208 provide extremely fast line and load transient response using ceramic output capacitors. they require no loop compensation, simplifying circuit implementation and reducing overall component count. the control loop also provides 0.07% load and 0.15% line regulation and maintains constant operating frequency. a selectable power saving mode allows the user to operate in discontinuous conduction mode (dcm) at light current loads thereby sig- nificantly increasing the converter efficiency. a host of protection features, including over-current, over-temperature, short-circuit and uvlo, helps achieve safe operation under abnormal operating conditions. the XR76203/5/8 are available in a rohs-compliant, green/halogen-free space-saving qfn 5x5mm package. features ? controller, drivers, bootstra p diode and mosfets integrated in one package ? 3a, 5a and 8a step down regulators ? wide 5v to 40v input voltage range ? > 0.6v adjustable output voltage ? proprietary constant on-time control ? no loop compensation required ? stable ceramic output capacitor operation ? programmable 200ns to 2s on-time ? constant 100khz to 800khz frequency ? selectable ccm or ccm/dcm ? ccm/dcm for high efficiency at light-load ? ccm for constant freq uency at light-load ? programmable hiccup current limit with thermal compensation ? precision enable and power good flag ? programmable soft-start ? 30-pin 5x5mm qfn package applications ? distributed po wer architecture ? point-of-load converters ? power supply modules ? fpga, dsp, and processor supplies ? base stations, switches/routers, and servers ordering information C back page typical application 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 5 10152025303540 v out (v) v in (v) pgnd fb ilim sw bst xr76208 vin en/mode pgood vcc ss ton agnd c ss r on c vcc enable/mode power good r v in v out r lim c bst l1 c ff r1 r2 c out c in xr76205 pvin XR76203 line regulation
? 2015 exar corporation XR76203/5/8 2 / 20 exar.com/XR76203/5/8 rev 1a absolute maximum ratings stresses beyond the limits listed below may cause perma- nent damage to the device. exposure to any absolute max- imum rating condition for extended periods may affect device reliability and lifetime. pv in , v in ...................................................................-0.3v to 43v v cc ...........................................................................-0.3v to 6.0v bst..........................................................................-0.3v to 48v 1 bst-sw.......................................................................-0.3v to 6v sw, ilim..................................................................-1v to 43v 1, 2 all other pins.................................................-0.3v to vcc+0.3v storage temperature...........................................-65c to +150c junction temperature..........................................................150c power dissipation...............................................internally limited lead temperature (soldering, 10 sec).......... .............. ........300c esd rating (hbm - human body model)............... ........... .....2kv operating conditions pv in ...............................................................................5v to 40v v in .................................................................................5v to 40v sw, ilim.....................................................................-1v to 40v 1 pgood, v cc , t on , ss, en, fb...............................-0.3v to 5.5v switching frequency... .............. .............. .......100khz to 800khz 3 junction temperature range..............................-40c to +125c XR76203 jedec51 package thermal resistance, ? ja ............... 28c/w xr76205 jedec51 package thermal resistance, ? ja ............... 26c/w xr76208 jedec51 package thermal resistance, ? ja ............... 25c/w XR76203 package power dissipation at 25c......... ........... ..3.6w xr76205 package power dissipation at 25c......... ........... ..3.8w xr76208 package power dissipation at 25c......... ........... ..4.0w note 1: no external voltage applied. note 2: sw pins minimum dc range is -1v, transient is -5v for less than 50ns. note 3: recommended frequency electrical characteristics unless otherwise noted: t j = 25c, v in =24v, bst=v cc , sw=agnd=pgnd=0v, c vcc =4.7uf. limits applying over the full operating temperature range are denoted by a ? symbol parameter conditions min typ max units power supply characteristics v in input voltage range vcc regulating ? 5.5 40 v i vin vin input supply current not switching, v in = 24v, v fb = 0.7v ? 0.7 2 ma i vin vin input supply current (XR76203) f=300khz, r on =215k, vfb=0.58v 12 ma i vin vin input supply current (xr76205) f=300khz, r on =215k, vfb=0.58v 15 ma i vin vin input supply current (xr76208) f=300khz, r on =215k, vfb=0.58v 19 ma i off shutdown current enable = 0v, v in = 12v 1 a enable and under-voltage lock-out uvlo v ih_en_1 en pin rising threshold ? 1. 8 1. 9 2 . 0 v v en_h_1 en pin hysteresis 70 mv v ih_en_2 en pin rising threshold for dcm/ ccm operation ? 2.8 3.0 3.1 v v en_h_2 en pin hysteresis 100 mv
? 2015 exar corporation XR76203/5/8 3 / 20 exar.com/XR76203/5/8 rev 1a vcc uvlo start threshold, rising edge ? 4.00 4.25 4.40 v vcc uvlo hysteresis 230 mv reference voltage v ref reference voltage v in = 5.5v to 40v, vcc regulating 0.596 0.600 0.604 v v in = 5.5v to 40v, vcc regulating ? 0.594 0.600 0.606 v dc line regulation ccm, closed loop, v in =5.5v-40v, applies to any c out 0.33 % dc load regulation ccm, closed loop, applies to any c out 0.39 % programmable constant on-time t on1 on-time 1 r on = 237k, v in = 40v ? 1570 1840 2120 ns f corresponding to on-time 1 v out = 24v, v in = 40v, r on = 237k ? 283 326 382 khz t on(min) minimum programmable on-time r on = 14k, v in = 40v 120 ns t on2 on-time 2 r on = 14k, v in = 24v ? 174 205 236 ns t on3 on-time 3 r on = 35.7k, v in = 24v ? 407 479 550 ns f corresponding to on-time 3 v out = 3.3v, v in = 24v, r on = 35.7k ? 250 287 338 khz f corresponding to on-time 3 v out = 5.0v, v in = 24v, r on = 35.7k ? 379 435 512 khz minimum off-time ? 250 350 ns diode emulation mode zero crossing threshold dc value measured during test -2 mv soft-start ss charge current ? -14 -10 -6 a ss discharge current fault present ? 1ma vcc linear regulator vcc output voltage v in = 6v to 40v, i load = 0 to 30ma ? 4.8 5.0 5.2 v v in = 5v, i load = 0 to 20ma ? 4.51 4.7 v power good output power good threshold -10 -6.9 -5 % power good hysteresis 1. 6 4 % power good sink current 1 ma protection: ocp, otp, short-circuit hiccup timeout 110 m s ilim pin source current 45 50 55 a ilim current temperature coefficient 0.4 %/c ocp comparator offset ? -8 0 +8 mv symbol parameter conditions min typ max units
? 2015 exar corporation XR76203/5/8 4 / 20 exar.com/XR76203/5/8 rev 1a note 1: guaranteed by design current limit blanking gl rising>1v 100 ns thermal shutdown threshold 1 rising temperature 150 c thermal hysteresis 1 15 c vscth feedback pin short-circuit threshold percent of v ref , short circuit is active after pgood is asserted ? 50 60 70 % xrp76203 output power stage r dson high-side mosfet r dson i ds = 1a 115 16 0 m low-side mosfet r dson 40 59 m i out maximum output current ? 3a a xrp76205 output power stage r dson high-side mosfet r dson i ds = 2a 42 59 m low-side mosfet r dson 40 59 m i out maximum output current ? 5a a xrp76208 output power stage r dson high-side mosfet r dson i ds = 2a 42 59 m low-side mosfet r dson 16.2 21.5 m i out maximum output current ? 8a a symbol parameter conditions min typ max units
? 2015 exar corporation XR76203/5/8 5 / 20 exar.com/XR76203/5/8 rev 1a pin configuration, top view 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 pvin pad sw pad agnd pad pgnd pad pvin pvin pvin pvin pvin pvin pvin pvin pgnd pgnd pgnd pgnd pgnd sw sw sw sw sw sw bst ilim en ton ss pgood fb agnd vin vcc agnd 10 29
? 2015 exar corporation XR76203/5/8 6 / 20 exar.com/XR76203/5/8 rev 1a pin assignments type: a = analog, i = input, o = output, i/o = input/output, pwr = power, od = open-drain pin no. pin name type description 1 ilim a over-current protec tion programming. connect wi th a resistor to sw. 2 en/mode i precision enable pin. pulling this pin above 1. 9v will turn the regulator on and it will operate in ccm. if the voltage is raised above 3.0v then the regulator will operate in dcm/ccm depend- ing on load 3 ton a constant on-time programming pin. connect with a resistor to agnd. 4 ss a soft-start pin. connect an exte rnal capacitor between ss and agnd to program the soft-start rate based on the 10ua internal source current. 5 pgood o, od power-good output. this open-drain output is pulled low when v out is outside the regulation. 6 fb a feedback input to feedback comparator. connect with a set of resistors to vout and agnd in order to program v out . 7, 1 0 , a g n d pad agnd a signal ground for control circuitry. connect agnd pad with a short trace to pins 7 and 10. 8 vin a supply input for the regulators ldo. normally it is connected to pvin. 9 vcc a the output of regulators ldo. for operation using a 5v rail, vcc should be shorted to vin. 11-14, 20, 29, sw pad sw pwr switch node. drain of the lo w-side n-channel mosfet. source of the high-side mosfet is wire-bonded to the sw pad. pins 20 and 29 are internally connected to sw pad. 15-19, pgnd pad pgnd pwr ground of the power stage. should be connect ed to the systems power ground plane. source of the low-side mosfet is wire-bonded to pgnd pad. 21-28, pvin pad pvin pwr input voltage for power stage. drai n of the high-side n-channel mosfet. 30 bst a high-side driver supply pin. connect a bootstrap capacitor between bst and pin 29.
? 2015 exar corporation XR76203/5/8 7 / 20 exar.com/XR76203/5/8 rev 1a functional block diagram q q r s dead time control on-time 1.9 v hiccup mode + - pgnd fb vin gh minimum on time enable hiccup ocp comparator feedback comparator current emulation & dc correction pgood ldo vcc vcc gl sw bst vcc 50ua + - + - + - 3 v -2 mv sw enable ldo ccm or ccm/dcm zero cross detect if 8 consecutive zcd then dcm if 1 non-zcd then exit dcm q q r s agnd ilim if four consecutive ocp vin ton + - + - + - pgood comparator short-circuit detection 0.555 v 0.36 v switching enabled 10ua + - switching enabled ss 0.6 v + - + - switching enabled enable ldo vcc uvlo 4.25 v otp 150 c t j vcc t on enable ldo pvin en/mode fb 0.6v
? 2015 exar corporation XR76203/5/8 8 / 20 exar.com/XR76203/5/8 rev 1a typical performance characteristics unless otherwise noted: v in = 24v, v out =3.3v, i out =8a, f=400khz, t a = 25c. schematic from the application information section. figure 1: load regulation figure 2: line regulation figure 3: t on versus r on figure 4: t on versus v in , r on =27.4k figure 5: frequency versus i out figure 6: frequency versus v in 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 5 10152025303540 v out (v) v in (v) 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 02468 v out (v) i out (a) 10 100 1,000 1 10 100 t on (ns) r on (k) typical calculated 100 300 500 700 900 1,100 1,300 1,500 5 10152025303540 t on (ns) v in (v) calculated typical 0 100 200 300 400 500 600 02468 f (khz) i out (a) 0 100 200 300 400 500 600 5 10152025303540 f (khz) v in (v)
? 2015 exar corporation XR76203/5/8 9 / 20 exar.com/XR76203/5/8 rev 1a typical performance characteristics unless otherwise noted: v in = 24v, v out =3.3v, i out =8a, f=400khz, t a = 25c. schematic from the application information section. figure 7: xr76208 i ocp versus r lim figure 8: xr76205 i ocp versus r lim figure 9: XR76203 i ocp versus r lim figure 10: i lim versus temperature figure 11: v ref versus temperature figure 12: t on versus temperature, r on =35.7k 2 4 6 8 10 12 14 23456 i ocp (a) r lim (k) 0 2 4 6 8 45678 i ocp (a) r lim (k) 590 595 600 605 610 -40 -20 0 20 40 60 80 100 120 v ref (mv) t j ( c) 430 440 450 460 470 480 490 500 510 520 530 -40-200 20406080100120 ton (ns) t j ( c) 30 40 50 60 70 -40 -20 0 20 40 60 80 100 120 ilim (ua) t j ( c) 0 1 2 3 4 5 2.5 3.0 3.5 4.0 4.5 i ocp (a) r lim (k)
? 2015 exar corporation XR76203/5/8 10 / 20 exar.com/XR76203/5/8 rev 1a typical performance characteristics unless otherwise noted: v in = 24v, v out =3.3v, i out =8a, f=400khz, t a = 25c. schematic from the application information section. figure 13: steady state, i out =8a figure 14: steady state, dcm, i out =0a figure 15: power up, forced ccm figure 16: power up, dcm/ccm figure 17: load step, forced ccm, 0a-4a-0a figure 18: load step, dcm/ccm, 0a-4a-0a
? 2015 exar corporation XR76203/5/8 11 / 20 exar.com/XR76203/5/8 rev 1a efficiency unless otherwise noted: t ambient = 25 c, no air flow, f=400khz, inductor losses are included, schematic from the applica- tion information section. figure 19: xr76208 efficiency, v in =12v figure 20: xr76208 efficiency, v in =24v figure 21: xr76205 efficiency, v in =12v figure 22: xr76205 efficiency, v in =24v figure 23: XR76203 efficiency, v in =12v figure 24: XR76203 efficiency, v in =24v 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 3.3uh 4.7uh 6.8uh 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 12v dcm 12v ccm 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 3.3uh 4.7uh 6.8uh 10uh 200khz 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 12v dcm 12v ccm 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 6.8uh 4.7uh 3.3uh 2.2uh 200khz 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 2.2uh 3.3uh 4.7uh 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 3.3uh 2.2uh 1.5uh 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 0.1 1.0 10.0 efficiency % i out (a) 12v dcm 12v ccm 5.0v dcm 5.0v ccm 3.3v dcm 3.3v ccm 1.8v dcm 1.8v ccm 200khz, 8.2uh 3.3uh 2.2uh 1.5uh
? 2015 exar corporation XR76203/5/8 12 / 20 exar.com/XR76203/5/8 rev 1a thermal derating unless otherwise noted: no air flow, f=400khz, schematic from the application information section. figure 25: xr76208, v in =12v figure 26: xr76208, v in =24v figure 27: xr76205, v in =12v figure 28: xr76205, v in =24v figure 29: XR76203, v in =12v figure 30: XR76203, v in =24v 50 60 70 80 90 100 110 120 130 12345678 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 50 60 70 80 90 100 110 120 130 12345678 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 12 vout 200khz 50 60 70 80 90 100 110 120 130 12345 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 50 60 70 80 90 100 110 120 130 12345 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 12 vout 200khz 50 60 70 80 90 100 110 120 130 1.0 1.5 2.0 2.5 3.0 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 50 60 70 80 90 100 110 120 130 1.0 1.5 2.0 2.5 3.0 t ambient (c) i out (a) 1.8 vout 3.3 vout 5.0 vout 12 vout 200khz
? 2015 exar corporation XR76203/5/8 13 / 20 exar.com/XR76203/5/8 rev 1a functional description XR76203, xr76205 and xr76208 are synchronous step- down proprietary emulated current-mode constant on- time (cot) regulators. the on-time, which is programmed via r on , is inversely proportional to v in and maintains a nearly constant frequency. the emulated current-mode control is stable with ceramic output capacitors. each switching cycle begins with gh signal turning on the high-side (control) fet for a preprogrammed time. at the end of the on-time, the high-side fet is turned off and the low-side (synchronous) fet is turned on for a preset mini- mum time (250ns nominal). this parameter is termed mini- mum off-time. after the minimum off-time, the voltage at the feedback pin fb is compared to an internal voltage ramp at the feedback comparator. when v fb drops below the ramp voltage, the high-side fet is turned on and the cycle repeats. this voltage ramp constitutes an emulated current ramp and makes possible the use of ceramic capacitors, in addition to other capacitor types, for output fil- tering. enable/mode input (en/mode) en/mode pin accepts a tri-level signal that is used to con- trol turn on/off. it also selects between two modes of opera- tion: forced ccm and dcm/ccm. if en is pulled below 1.8v, the regulator shuts down. a voltage between 2.0v and 2.8v selects the forced ccm mode which will run the regulator in continuous conduction at all times. a voltage higher than 3.1v selects the dcm/ccm mode which will run the regulator in discontinuous conduction at light loads. selecting the forced ccm mode in order to set the regulator to operate in forced ccm, a voltage between 2.0v and 2.8v must be applied to en/ mode. this can be achieved with an external control signal that meets the above voltage requirement. where an exter- nal control is not available, the en/mode can be derived from v in . if v in is well regulated, use a resistor divider and set the voltage to 2.5v. if v in varies over a wide range, the circuit shown in figure 31 can be used to generate the required voltage. note that at v in of 5.5v and 40v the nom- inal zever voltage is 4.0v and 5.0v respectively. therefore for v in in the range of 5.5v to 40v, the circuit shown in fig- ure 31 will generate v en required for forced ccm. selecting the dcm/ccm mode in order to set the regulator operation to dcm/ccm, a volt- age between 3.1v and 5.5v must be applied to en/mode pin. if an external control signal is available, it can be directly connected to en/mode. in applications where an external control is not available, en/mode input can be derived from v in . if v in is well regulated, use a resistor divider and set the voltage to 4v. if v in varies over a wide range, the circuit shown in figure 32 can be used to gener- ate the required voltage. figure 31: selecting forced ccm by deriving en/mode from v in figure 32: selecting dcm/ccm by deriving en/mode from v in ? r1 30.1k, 1% rz 10k en/mode r2 35.7k, 1% zener mmsz4685t1g or equivalent in v zener mmsz4685t1g or equivalent rz 10k en/mode v in v en
? 2015 exar corporation XR76203/5/8 14 / 20 exar.com/XR76203/5/8 rev 1a programming the on-time the on-time t on is programmed via resistor r on accord- ing to following equation: where t on is calculated from: where: f is the desired switching frequency at nominal i out eff is the regulator efficiency corresponding to nominal i out shown in figures 19-24 substituting for t on in the first equation we get: over-current protection (ocp) if load current exceeds the programmed over-current, i ocp , for four consecutive switching cycles, the module enters hiccup mode of operation. in hiccup, the mosfet gates are turned off for 110ms (hiccup timeout). following the hic- cup timeout, a soft-start is attempted. if ocp persists, hic- cup timeout will repeat. the module will remain in hiccup mode until load current is reduced below the programmed i ocp . in order to program the over-current protection, use the following equation: where: rlim is resistor value for programming i ocp i ocp is the over-current threshold to be programmed rds is the mosfet rated on resistance; xr76208=21.5m, xr76205=59m, XR76203=59m 8mv is the ocp comparator maximum offset ilim is the internal current that generates the necessary ocp comparator threshold (use 45a). note that ilim has a positive temperature coefficient of 0.4%/c (figure 10). this is meant to roughly match and compensate for positive temperature coefficient of the syn- chronous fet. graph of typical i ocp versus rlim is shown in figure 7-9. maximum allowable rlim for xr76205 is 8.06k. short-circuit protection (scp) if the output voltage drops below 60% of its programmed value, the module will enter hiccup mode. hiccup will per- sist until short-circuit is removed. scp circuit becomes active after pgood asserts high. over-temperature (otp) otp triggers at a nominal die temperature of 150c. the gate of switching fet and synchronous fet are turned off. when die temperature cools down to 135c, soft-start is ini- tiated and operation resumes. programming the output voltage use an external voltage divider as shown in the application circuit to program the output voltage v out . where r2 has a nominal value of 2k. programming the soft-start place a capacitor css between the ss and agnd pins to program the soft-start. in order to program a soft-start time of tss, calculate the required capacitance css from the following equation: r on v in t on 25 9 ? ? 10 ?? ? ?? ? 3.05 10 ? ? 10 --------------------- --------------------- ----------------- - = t on v out v in feff ? ? ------------------ ------------ = r on v out feff ? --------------- ?? ?? 25 9 ? ? 10 ?? v in ? ?? ? 3.05 10 ? ? 10 --------------------- ------------------ ------------------ ---------------- = rlim i ocp rds ? ?? 8mv + ilim ------------------- ------------------ ---------------- - = r1 r2 v out 0.6 ------------- 1 ? ?? ?? ? = css tss 10 ? a 0.6v -------------- ?? ?? ? =
? 2015 exar corporation XR76203/5/8 15 / 20 exar.com/XR76203/5/8 rev 1a feed-forward capacitor (c ff ) a feed-forward capacitor (c ff ) may be necessary depend- ing on the equivalent series resistance (esr) of c out . if only ceramic output capacitors are used for c out then a c ff is necessary. calculate c ff from: where: r1 is the resistor that c ff is placed in parallel with f lc is the frequency of output filter double-pole f lc frequency must be less than 11khz when using ceramic c out . if necessary, increase l and/or c out in order to meet this constraint. when using capacitors with higher esr, such as pana- sonic tpe series, a c ff is not required provided following conditions are met: 1. the frequency of output filter lc double-pole f lc should be less than 11khz. 2. the frequency of esr zero f zero,esr should be at least five times larger than f lc . note that if f zero,esr is less than 5xf lc , then it is recom- mended to set the f lc at less than 2khz. cff is still not required. maximum allowable voltage ripple at fb pin note that the steady-state voltage ripple at feedback pin fb (v fb,ripple ) must not exceed 50mv in order for the regula- tor to function correctly. if v fb,ripple is larger than 50mv then c out should be increased as necessary in order to keep the v fb,ripple below 50mv. feed-forward resistor (r ff ) poor pcb layout can cause fet switching noise at the out- put and may couple to the fb pin via c ff. excessive noise at fb will cause poor load regu lation. to solve this problem place a resistor r ff in series with c ff . r ff value up to 2% of r1 is acceptable. c ff 1 2 ? r 17 f lc ? ? ? ? ----------------- ------------------ -------------- =
? 2015 exar corporation XR76203/5/8 16 / 20 exar.com/XR76203/5/8 rev 1a application circuit, xr76208 rsnb 1 ohm csnb 0.56nf r4 2k u1 xr76208 ilim 1 ton 3 en 2 ss 4 vcc 9 agnd 10 sw 11 sw 12 pgood 5 fb 6 agnd 7 vin 8 sw 13 sw 14 pgnd 15 bst 30 pgnd 17 pgnd 18 pgnd 19 sw 20 pvin 21 pvin 22 pvin 23 pvin 24 pvin 25 pvin 26 pvin 27 pvin 28 sw 29 pgnd 16 agnd pad 31 pgnd pad 32 sw pad 33 pvin pad 34 400khz, 3.3v @ 0-8a 24vin cin 2x 10uf/50v cvcc 4.7uf ihlp-5050fd-01 2.2uh r1 9.09k r2 2k css 47nf cin 0.1uf r5 10k cff 0.27nf pvin cout 3x 47uf/10v vcc ron 28k fb r3 18.2k cbst 1uf rlim 5.49k sw fb optional
? 2015 exar corporation XR76203/5/8 17 / 20 exar.com/XR76203/5/8 rev 1a application circuit, xr76205 rsnb 1 ohm csnb 0.33nf r4 2k u1 xr76205 ilim 1 ton 3 en 2 ss 4 vcc 9 agnd 10 sw 11 sw 12 pgood 5 fb 6 agnd 7 vin 8 sw 13 sw 14 pgnd 15 bst 30 pgnd 17 pgnd 18 pgnd 19 sw 20 pvin 21 pvin 22 pvin 23 pvin 24 pvin 25 pvin 26 pvin 27 pvin 28 sw 29 pgnd 16 agnd pad 31 pgnd pad 32 sw pad 33 pvin pad 34 24vin 400khz, 3.3v @ 0-5a cin 1x 10uf/50v cvcc 4.7uf wurth-74437368033 3.3uh r1 9.09k r2 2k css 47nf cin1 0.1uf r5 10k cff 0.27nf pvin cout 2x 47uf/10v vcc ron 29.4k fb r3 18.2k cbst 1uf rlim 8.06k sw fb optional
? 2015 exar corporation XR76203/5/8 18 / 20 exar.com/XR76203/5/8 rev 1a application circuit, XR76203 sw r4 2k u1 XR76203 ilim 1 ton 3 en 2 ss 4 vcc 9 agnd 10 sw 11 sw 12 pgood 5 fb 6 agnd 7 vin 8 sw 13 sw 14 pgnd 15 bst 30 pgnd 17 pgnd 18 pgnd 19 sw 20 pvin 21 pvin 22 pvin 23 pvin 24 pvin 25 pvin 26 pvin 27 pvin 28 sw 29 pgnd 16 agnd pad 31 pgnd pad 32 sw pad 33 pvin pad 34 400khz, 3.3v @ 0-3a 24vin cin 10uf/50v cvcc 4.7uf wurth-74437368047 4.7uh r1 9.09k r2 2k css 47nf cin1 0.1uf r5 10k cff 0.22nf pvin cout 47uf/10v vcc ron 28k fb r3 18.2k cbst 1uf sw rlim 4.02k fb
? 2015 exar corporation XR76203/5/8 19 / 20 exar.com/XR76203/5/8 rev 1a mechanical dimensions
? 2015 exar corporation XR76203/5/8 20 / 20 exar.com/XR76203/5/8 rev 1a for further assistance: technical support: techsupport.exar.com technical documentation: www.exar.com/techdoc exar corporation headquarters and sales offices 48720 kato road tel.: +1 (510) 668-7000 fremont, ca 95438 - usa fax: +1 (510) 668-7001 notice exar corporation reserves the right to make changes to the produc ts contained in this publication in order to improve design, p erformance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained herein are only for illustration purposes and may vary depending upon a users specific application. while the information in this publication has been carefully checked; no re sponsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its product s in life support applications where the failure or malfunctio n of the product can reasonably be expected to cause failure of the life support system or to significantly af fect its safety or effectiveness. products are not authorized fo r use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user as sumes all such risks; (c) potential liability of exar cor- poration is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. ordering information yy = year (last two digi ts)- ww = work week- x = lot number; when applicable revision history part number package jedec compliant operating temperature range packaging marking xr76208el-f 5x5mm qfn yes -40c to +125c tr ay 76208e yywwf xxxxxx xr76208eltr-f tape and reel xr76208elmtr-f mini tape and reel xr76208evb xr76208 evaluation board xr76205el-f 5x5mm qfn yes -40c to +125c tr ay 76205e yywwf xxxxxx xr76205eltr-f tape and reel xr76205elmtr-f mini tape and reel xr76205evb xr76205 evaluation board XR76203el-f 5x5mm qfn yes -40c to +125c tr ay 76203e yywwf xxxxxx XR76203eltr-f tape and reel XR76203elmtr-f mini tape and reel XR76203evb XR76203 evaluation board revision date description 1a february 2015 ecn: 1509-04 feb 2015

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