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x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h july 2011 rev. 1.1.0 exar corporation www.exar.com 48720 kato road, fremont ca 94538, usa tel. +1 510 668-7000 ? fax. +1 510 668-7001 general description the xrp2527 and xrp2528 devices are respectively single and dual channel integrated high-side power distribution switches with independent enables, fault flags and precise programmable current limit thresholds. a wide 1.8v to 5.5v input voltage range allows for operations from industry standard 1.8v, 3.3v and 5v power rails. current limit thresholds can be programmed accurately and independently for each channel via an external resist or. a simple setting optimizes the xrp2527 and xrp2528 for use in usb 2.0 or 3.0 compliant v bus power distribution architectu res. these devices can be used in any self or bus powered usb applications. the power-switch rise and fall times are controlled to minimize current surges during turn on/off. built-in over current, under voltage lockout (uvlo), reverse current and over temperature protections insure safe operations under abnormal operating conditions. xrp2527 and xrp2528 are offered respectively in rohs compliant ?green?/halogen free 3mm x 3mm 8-pin and 10-pin tdfn packages. applications ? generic power switching ? self powered usb 2.0 and 3.0 hubs ? usb compliant v bus power distribution ? audio-video equipments features ? single/dual channel current switch ? 1a per channel capable ? 1.8v to 5.5v input voltage range ? programmable over-current limit ? 300ma to 1a set via external resistor ? 8% threshold accuracy at 1a ? usb 2.0/3.0 compliant ? individual channel enable ? individual channel fault flag indicator ? under voltage lockout, reverse current and thermal shutdown protection ? rohs compliant, green/halogen free 8-pin and 10-pin tdfn package typical application diagram fig. 1: xrp2528 application diagram
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 2/13 rev. 1.1.0 absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v in .......................................................... -0.3v to 7.0v v en , v flg ............................................................... 7.0v storage temperatur e .............................. - 65c to 150c power dissipat ion ................................ internal ly limited lead temperature (sol dering, 10 se c) ................... 300c esd rating (hbm - huma n body mode l) .................... 2kv esd rating (mm - machine model) ........................... 200v operating ratings input voltage range v in ............................. 1.75v to 5.5v junction temperature range .................... -40c to 125c thermal resistance ja ................................................. tdfn-8 l .................................................... 43.0c/w tdfn-10l .................................................. 40.5c/w electrical specifications specifications are for an operating junction temperature of t j = 25c only; limits applying over the full operating junction temperature range are denoted by a ???. minimum and maximum limits are guaranteed through test, design, or statistical correlation. typical values represent th e most likely parametric norm at t j = 25c, and are provided for reference purposes only. unless otherwise indicated, v in = 1.8v to 5.5v, c in = 47f//1 f, c out = 10f, t j = ?40c to 125c. parameter min. typ. max. units conditions input supply voltage 1.8 5.5 v ? input quiescent current 80 150 a ? xrp2528, (both channels enabled) v in =5v, i out1 = i out2 =0ma input quiescent current 52 100 a ? xrp2527 and xrp2528 (1 channel enabled) v in =5v, i out1 =0ma input shutdown current 3 a ? v in =5v, channel(s) disabled maximum output current per channel 1 a ? xrp2527 and xrp2528. rset=100k ? output leakage current 10 a v in =5v, v out =0v, each channel, switch off reverse leakage current 10 a v in =0v, v out =5v, each channel, switch off output mosfet resistance 80 140 m ? ? i out =0.3a, each channel output turn-on delay 1000 s v in =5v, r l =10 ? , c out =1f, each output output turn-on rise time 2000 4000 s v in =5v, r l =10 ? , c out =1f, each output output turn-off delay 10 20 s v in =5v, r l =10 ? , c out =1f, each output output turn-off fall time 22 50 s v in =5v, r l =10 ? , c out =1f, each output current limit threshold 0.90 1.15 1.4 a ? v in ? v out =0.3v, rset floating, usb 3.0 0.68 0.85 1.02 a ? v in ? v out =0.3v, rset tied to v in, usb 2.0 current limit threshold range 0.3 1 a current limit threshold accuracy 1 1.087 1.174 a ? rset=100k ? for i lim(min) =1a, v in -v out =0.3v short circuit current limit 0.66xi lim a v out =0v output voltage short circuit detect threshold 925 mv device operates in short circuit current limit mode when output voltage is below the threshold. safe operating area (soa) current limit 3 a over temperature shutdown threshold 135 c temperature rising over temperature shutdown threshold hysteresis 10 c temperature decreasing under-voltage lockout threshold 1.55 1.68 1.75 v v in rising or falling under-voltage lockout hysteresis 50 mv flg output logic low voltage 100 250 mv i flg =10ma, v in =5.5v flg output high leakage 1 a
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 3/13 rev. 1.1.0 parameter min. typ. max. units conditions flg blanking time 10 ms en input logic high voltage 1.5 v ? en input logic low voltage 0.5 v ? en input leakage current -1 0 1 a v en =0v or v en =5.5v block diagram fig. 2: xrp2527-xrp2528 block diagrams
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 4/13 rev. 1.1.0 pin assignment fig. 3: xrp2527/28 pin assignment pin description ? xrp2527 name pin number description en 1 channel enable input flg 2 error flag signal active low open drain output. active on over-current, over-temperature or uvlo conditions. gnd 3 ground signal nc 5,6 no connect in 7 voltage input pin out 8 voltage output pin rset 4 current limiting threshold setting rset floating: usb 3.0 current limit settings rset tied to in: usb 2.0 current limit settings rset tied to gnd via resistor r: adjustable current limit pin description ? xrp2528 name pin number description en x 1,4 channel enable input flg x 2,3 error flag signal active low open drain output. active on over-current, over-temperature or uvlo conditions. gnd 8 ground signal in 9 voltage input pin out x 7,10 voltage output pin rset x 5,6 current limiting threshold setting rset floating: usb 3.0 current limit settings rset tied to in: usb 2.0 current limit settings rset tied to gnd via resistor r: adjustable current limit ordering information part number temperature range marking package packing quantity note 1 note 2 XRP2527IHB-1-F -40c t a +85c 2527i yyww 1 x tdfn8 bulk lead free and halogen free single channel active high xrp2527ihbtr-1-f 2.5k/tape & reel xrp2528ihb-1-f -40c t a +85c 2528i yyww 1 x tdfn10 bulk lead free and halogen free dual channel active high xrp2528ihbtr-1-f 2.5k/tape & reel xrp2527evb xrp2527 evaluation board xrp2528evb xrp2528 evaluation board ?yy? = year ? ?ww? = work week ? ?x? = lot number ? outa gnd rseta ena flga in 1 2 3 4 9 7 8 10 xrp2528 tdfn-10l 3mm x 3mm 11 gnd 5 enb flgb 6 outb rsetb
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 5/13 rev. 1.1.0 typical performance characteristics all data taken at v in = 5v, c in = 47f//1f, c out = 10f, t j = t a = 25c, unless otherwise specified - schematic and bom from application information section of this datasheet. fig. 4: output on-resistance vs. temperature (xrp2527) fig. 5: output on-resistance vs. temperature (xrp2528) fig. 6: off supply current vs. temperature fig. 7: quiescent current vs. temperature xrp2527 and xrp2528 (1-channel on) fig. 8: quiescent current vs. temperature xrp2528 ( 2-channels on ) fig. 9: flg logic low voltage vs. temperature
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 6/13 rev. 1.1.0 fig. 10: quiescent curre nt vs. input voltage xrp2527 and xrp2528 (1-channel on) fig. 11: quiescent curre nt vs. input voltage xrp2528 (2-channels on) fig. 12: output turn-off delay vs. temperature fig. 13: output turn-on delay vs. temperature fig. 14: output fall time vs. temperature fig. 15: output rise time vs. temperature
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 7/13 rev. 1.1.0 fig. 16: output turn-off de lay time vs. input voltage fig. 17: output turn-on delay time vs. input voltage fig. 18: output fall time vs. input voltage fig. 19: output rise time vs. input voltage fig. 20: current limit threshold vs. temperature (xrp2527) fig. 21: current limit threshold vs. temperature (xrp2528)
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 8/13 rev. 1.1.0 fig. 22: under-voltage lockout trip level vs. temperature (vin rising) fig. 23: current limit threshold vs. rset resistor value fig. 24: turn-on, turn-off characteristics (xrp2528): cout = 1uf, rload = 10 ? , rset floating fig. 25: turn-on, turn-off characteristics (xrp2528): cout = 1uf, rload = 5 ? , rset floating fig. 26: current limit operation (xrp2527): vin=5.5v, rload = 3.9 ? , usb3.0 fig. 27: current limit operation (xrp2528): vin=1.8v, rload = 1.5 ? , usb2.0 0 200 400 600 800 1000 1200 100 150 200 250 300 350 current limit threshold (ma) rset (kohm) current limit threshold vs. rset resistor xrp2527 & xrp2528 (both channels) vin=5v vin=3.3v vin=1.8v
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 9/13 rev. 1.1.0 fig. 28: current limit operation (xrp2527): vin=5v, rload = 10 ? , rset = 330k ? theory of operation the xrp2527 and xrp2528 devices are respectively single and dual channel integrated high-side power distribution switches with programmable current limi t threshold feature. they can be used in any self or bus powered usb applications and are compliant with the latest usb 3.0 specifications. the reverse current protection featur e prevents current to flow from out to in when the device is disabled. i nput & o utput placing bulk capacitances of at least 47 f and 10 f at the input and output pins respectively reduces power supply transients under heavy current load conditions. it is important to place a 1 f ceramic bypass capacitor from in to gnd as close as possible to the device in order to control supply transients. furthermore, bypassing the output pin with a 0.1 f to 1 f ceramic capacitor improves the device response to short-circuit transients. e rror f lag the error flag signal (flg x output pin) is an open-drain output and is pulled low (active low) upon detection of the following conditions: ? over-current condition ? over-temperature condition ? under voltage lockout condition over-temperature and under voltage lockout conditions are flagged immediately while the output over ? current condition is reported if continuously persistent for longer than the blanking time of 10ms . the blanking time prevents erroneous report ing of current faults due to brief output current spikes. once activated, the error flag signal remains low until all fault conditions have been removed and is independent for each individual channel. c urrent l imit the current limit feature protects the output mosfet switches from damages resulting from undesirable short circuit conditions or excess inrush current, which is often encountered during hot plug-in. upon detection of overcurrent condition, the output current is limited to a constant current limit threshold value and the output voltage is reduced accordingly. triggering the current limit function is signal ed by the error flag after 10ms of blanki ng time period. the minimum current li mit threshold can be programmed from 300ma to 1a set via an external resistor at the rset pin. if rset pin is left floating, then the device is set to usb 3.0 current limit setting . for usb 2.0 current limit setting, the rset pin must be tied to vin. the current limit threshold value is set using the resistor at rset pin by the following equation:
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 10/13 rev. 1.1.0 typ. a 108.7 kohm please note that the allowed values for rset resistor are 100kohm < rset < 330kohm. u nder -v oltage l ockout under-voltage lockout function (uvlo) keeps the internal power switch from being turned on until the power supply has reached at least 1.68v, even if the switch is enabled. upon detection of an input voltage below approximately 1.68v, the power switch is turned off while a fault condition is reported by the error flag signal. t hermal p rotection internal thermal sensing circuitry monitors the operating temperature of the device for each channel independently. upon detection of a temperature in excess of 135c, the power switch for the given channel is disabled preventing any damages to the device while a fault condition is reported by the error flag signal. a built-in 10c hysteresis allows the device to cool down to 125c before resuming normal operations on the faulty channel at which point the error flag signal is cleared. t est c ircuit
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 11/13 rev. 1.1.0 package specification 8- pin tdfn
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 12/13 rev. 1.1.0 10- pin tdfn
x x r r p p 2 2 5 5 2 2 7 7 - - x x r r p p 2 2 5 5 2 2 8 8 s s i i n n g g l l e e / / d d u u a a l l c c h h a a n n n n e e l l a a d d j j u u s s t t a a b b l l e e c c u u r r r r e e n n t t p p o o w w e e r r d d i i s s t t r r i i b b u u t t i i o o n n s s w w i i t t c c h h ? 2011 exar corporation 13/13 rev. 1.1.0 revision history revision date description 1.0.0 05/13/2011 initial release of datasheet 1.1.0 07/14/2011 corrections of typographical errors for further assistance email: customersupport@exar.com exar technical documentation: http://www.exar.com/techdoc/default.aspx? e xar c orporation h eadquarters and s ales o ffices 48720 kato road fremont, ca 94538 ? usa tel.: +1 (510) 668-7000 fax: +1 (510) 668-7030 www.exar.com notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance 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 make s no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustr ation purposes and may vary depending upon a user?s specific application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the us e of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause fa ilure of the life support system or to significantly affect it s safety or effectiveness. products are not authorized for 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 assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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