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x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r november 2011 rev. 1.2.0 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 xrp6272 is a low dropout voltage regulator capable of a constant output current up to 2 amps. a wide 1.8v to 6v input voltage range allows for single supply operations from industry standard 1.8v, 2.8v, 3.3v, and 5v power rails as well as the 5.8v rail. with better than 2% output voltage accuracy, low output noise and high power supply rejection ratio (psrr), the xrp6272 is perfectly suited for powe ring rf circuitries. optimized for use with small low cost esr ceramic output capacitors and featuring a low 30a quiescent current, this device is also adequate for use in battery powered portable equipments. the xrp6272 operates by default as a 5v fixed output voltage regulator while usage of an external resistors divider allows adjustable out voltages as low as 0.7v. an enable function, power good flag and output noise reduction pin complete the feature set. built-in current limit and thermal protections insure safe operations under abnormal operating conditions. the xrp6272 is offered in rohs compliant, ?green?/halogen free 5-pin to-252 and 8-pin exposed pad soic packages. applications ? networking equipments ? rf circuitry power supplies ? set-top box equipments ? portable equipments features ? guaranteed 2a output current ? low 550mv dropout at 3.3v/2a ? 1.8v to 6v single input voltage range ? fixed 5v and adjustable output voltage ? 2% output voltage accuracy ? 30a quiescent current ? power good and enable functions ? 70db power supply rejection ratio ? low output noise ? 0.01a shutdown current ? current limit and thermal protection ? rohs compliant ?green?/halogen free 5-pin to-252 and 8-pin exposed pad soic packages typical application diagram fig. 1: xrp6272 application diagram
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 2/13 rev. 1.2.0 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 , en, bp .......................................................... 7.0v storage temperatur e .............................. - 65c to 150c power dissipat ion ................................ internal ly limited lead temperature (sol dering, 10 se c) ................... 260c junction temp erature .......................................... 150c esd rating (hbm - huma n body mode l) .................... 2kv esd rating (mm - machine model) ........................... 500v operating ratings input voltage range v in ................................. 1.8v to 6v operating temperature range ................... -40c to 85c thermal resistance ja (5-pin to-252) ......................................... 100c/w jc (5-pin to-252) ............................................ 8c/w ja (8-pin hsoic) ........................................... 60c/w jc (8-pin hsoic) ........................................... 15c/w electrical specifications specifications with standard type are fo r an operating junction temperature of t j = 25c only. minimum and maximum limits are guaranteed through test, design, or statistical co rrelation. typical values represent the most likely parametric norm at t j = 25c, and are provided for reference purp oses only. unless otherwise indicated, v in = v out + 1v, c in = 4.7f, c out = 4.7f or 10f (note 1), c byp = 22nf, t j = 25c. parameter min. typ. max. units conditions input voltage 1.8 6.0 v output voltage tolerance -2 +2 % i out = 1ma continuous output current 2 a v in 2.3v ground current 30 50 a v en ? 1.6v, no load 30 50 v en ? 1.6v, i out = 300ma standby current 0.01 0.5 a v en = 0 line regulation 3 15 mv v in = v out + 1v to 6v, i out =1ma load regulation 5 15 mv i out =1ma to 2a output current limit 2.2 3.0 3.9 a current fold back 1.0 a dropout voltage (note 2) 960 mv i out = 2a, v out =1.2v 700 900 i out = 2a, v out =1.8v 550 700 i out = 2a, v out =3.3v 480 600 i out = 2a, v out =5.0v reference voltage tolerance 0.686 0.7 0.714 v adj pin current 10 100 na v adj = v ref adj pin threshold 0.05 0.1 0.2 v enable turn-on threshold 1.6 v output on enable turn-off threshold 0.4 v output off shutdown pin current 0 0.5 a v en = 0 shutdown exit delay time 100 s max output discharge resistance to gnd during shutdown 20 100 ? pgood rise threshold 90 93 % pgood hysteresis 3 10 % pgood delay 0.5 5 ms pgood sink capability 0.2 0.4 v i pgood = 10ma ripple rejection 70 db f=1khz, ripple=0.5vp-p output noise voltage 24 vrms c bp = 22nf, f=10hz ~100khz temperature coefficient 50 ppm/ ? c thermal shutdown temperature 150 ? c v in = v out + 1v thermal shutdown hysteresis 20 ? c
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 3/13 rev. 1.2.0 note 1: in the case of v out 1.8v, c out = 10 f is recommended. note 2: dropout voltage is defined as input voltage minus ou tput voltage when the output voltage drops by 1% of its nominal value at v in = v out + 1v. note 3: v in (min) is the higher value of (v out + dropout voltage) or 1.8v. block diagram fig. 2: xrp6272 block diagram pin assignment fig. 3: xrp6272 pin assignment
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 4/13 rev. 1.2.0 pin description name soic-8 to-252 description en 1 1 enable pin. minimum 1.6v to enable the device. maximum 0.4v to shutdown the device. vin 2 2 power input pin. must be closely decoupled to gnd pin with a 4.7 f or greater ceramic capacitor. vout 3 4 regulator output pin. adj 4 5 adjustable pin. output voltage can be set by external feedback resistors when using a resistive divider. or, connect adj to gnd for vout = 5v, set by internal feedback resistors. gnd 5, 8 3 ground signal bp 6 - bypass pin. connect a 22nf capacitor to gnd to reduce output noise. bypass pin can be left floating if not necessary. pgood 7 - power good open drain output. gnd exposed pad tab connect to gnd. ordering information part number temperature range marking package packing quantity note 1 note 2 XRP6272ITC5TR-F -40c t a +85c exar xrp6272itc5 yywwf x 5-pin to-252 2k/tape & reel rohs compliant halogen free xrp6272idbtr-f -40c t a +85c xrp6272i yywwf xxxx 8-pin hsoic 2.5k/tape & reel rohs compliant halogen free ?yy? = year ? ?ww? = work week ? ?x? = lot number; when applicable.
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 5/13 rev. 1.2.0 typical performance characteristics all data taken at v in = v out + 1v, t j = t a = 25c, c in = 4.7f, c out = 4.7f or 10f (note 1) unless otherwise specified. fig. 4: gnd current vs. vin at vout=1.8v, no load fig. 5: gnd current vs. vin at vout=3.3v, no load fig. 6: gnd current vs. vin at vout=1.8v, 300ma fig. 7: gnd current vs. vin at vout=3.3v, 300ma fig. 8: gnd current vs. temp. at vout=1.8v, no load fig. 9: gnd current vs. temp. at vout=3.3v, no load
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 6/13 rev. 1.2.0 fig. 10: dropout voltage at vout = 1.8v fig. 11: dropout voltage at vout = 3.3v fig. 12: dropout voltage at vout = 5.0v fig. 13: load transient response at vout=1.8v, vin=2.8v fig. 14: load transient response at vout=3.3v, vin=4.3v fig. 15: load transient response at vout=5v, vin=6v
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 7/13 rev. 1.2.0 fig. 16: enable startup at vout = 1.8v fig. 17: shutdown at vout = 1.8v fig. 18: enable startup at vout = 5v fig. 19: shutdown at vout = 5v fig. 20: current foldback at vout = 1.8v fig. 21: current foldback at vout = 3.3v
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 8/13 rev. 1.2.0 fig. 22: psrr curve application information the xrp6272 is a low-dropout voltage regulator with low quiescent current, low noise and high psrr. it can support load current up to 2a. it incorporates current-limit and thermal protection features. t ypical a pplication s chematic p rogramming t he o utput v oltage xrp6272?s internal feedback resistors set the output voltage v out to 5v when the adj pin is connected to gnd. alternatively; the output voltage is adjustable vi a the external feedback resistor network r1 and r2 by calculating the following formula: ?? 1? r1 r2 ? where, v ref is the reference voltage set internally at 0.7v nominal. i nput & o utput c apacitors xrp6272 is optimized for use with ceramic capacitors. to ensure stability of the device, an output ceramic capacitor of at least 4.7f or 10f (for v out 1.8v) is recommended. an input capacitor of 4.7f is recommended. x5r or x7r ceramic capacitors are recommended as they have the best temperature and voltage characteristics. noise bypass capacitor a 22nf bypass capacitor at bp pin can reduce output voltage noise. this pin can be left floating if it is unnecessary. theory of operation s hutdown by connecting en pin to gnd, the xrp6272 can be shutdown to reduce the supply current to 0.01 a (typ.). in this mode, the output voltage of xrp6272 is equal to 0v. c urrent l imit the xrp6272 includes current limit protection feature, which monitors and controls the maximum output current. if the output is overloaded or shorted to ground, this can protect the device from being damaged. t hermal p rotection the xrp6272 includes a thermal protection feature that protects the ic by turning off the pass transistor when the maximum junction temperature t j exceeds 150oc.
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 9/13 rev. 1.2.0 p ower d issipation the power dissipation across the device can be calculated as: ?? ? ? -? ? the total junction temperature is calculated as: ? ? where, t j is the junction temperature, t a is the ambient temperature and ja is the thermal resistance between junction to ambient. there is a temperature rise associated with this power dissipated while operating in a given ambient temperature. if the calculated junction temperature exceeds maximum junction temperature specification, then the built-in thermal protection feature is triggered as described previously. to insure reliable performance, the maximum allowable power dissipation for a given ambient temperature must be considered and it can be calculated as follows: ? ? ? where, t j(max) is the maximum junction temperature, t a is the ambient temperature and ja is the thermal resistance between junction to ambient. in order to insure the best thermal flow, proper mounting of the ic is required. l ayout c onsideration 1. connect the bottom-side pad to a large ground plane for good thermal conductivity and to reduce the the rmal resistance of the device. 2. the input capacitor c in and output capacitor c out must be placed as close as possible to the pins v in and v out respectively. 3. use short wires to connect the power supply to pins v in and gnd on the board.
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 10/13 rev. 1.2.0 typical applications a pplication 1 fig. 23: 5v to 3.3v / 2a a pplication 2 fig. 24: 5.8v to 5v rf stage low noise power supply a pplication 3 fig. 25: 2.7v min to 1.8v / 2a power supply
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 11/13 rev. 1.2.0 package specification to-252-5l
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 12/13 rev. 1.2.0 e xposed p ad 8-p in soic
x x r r p p 6 6 2 2 7 7 2 2 2 2 a a 5 5 v v - - a a d d j j u u s s t t a a b b l l e e l l o o w w d d r r o o p p o o u u t t v v o o l l t t a a g g e e r r e e g g u u l l a a t t o o r r ? 2011 exar corporation 13/13 rev. 1.2.0 revision history revision date description 1.1.0 10/14/2011 initial release of data sheet 1.2.0 11/30/2011 corrected pin assignment package drawing 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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