x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 2013 rev. 1.3.0 exar corporation www.exar.com 48720 kato road, fremont ca 94538, usa tel. +1 510 668- 70 00 C fax. +1 510 668 - 70 01 general description the xrp29302 is a 3a, highly accurate voltage regulator with a low dropout voltage o f 600 mv ( typical) at 3a. this regulator is specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. it is fully fault protected against over - current, reverse battery, and positive and negative voltage transients. on - chip trimming adjusts the reference voltage to 1% initial accuracy. the xrp29302 is offered in 5 - pin to - 220 & to - 263 packages. applications ? adjustable power supplies ? constant current regulators ? audio and video/graphic cards ? battery chargers features ? 3a guaran teed output current ? low dropout voltage of 600 mv @ 3a ? adjustable output down to 1.25v ? 1% output accuracy ? tight load and line regulation ? fast transient response ? reverse battery protection ? zero current shutdown ? drop - in replacement to spx29302 ? lead free 5 - pin to220 and to263 package s typical application diagram fig. 1 : xrp29302 application diagram
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 2 / 9 rev. 1.3.0 absolute maximum rat ings 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. input voltage v in 1 ................................................... 20 v storage temperature .............................. - 65c to 150c lead temperature (soldering, 5 sec) ..................... 26 0c esd rating (hbm - human body model) .......................... all pins except en ................................................. 2kv en pin ................................................................. 1kv operating ratings input voltage range v in ........................................... 16 v junction temperature range .................... - 40c to 1 25c thermal resistance ...................................................... to - 220 junction to case @ t a ............................ 3c/w to - 220 junction to ambient ............................. 60c/w to - 263 junction to case @ t a ............................ 3c/w to - 263 junction to ambient ............................. 60c/w note 1 : maximum positive supply voltage of 20v must be of limited duration (<100 ms) and duty cycle of less than 1%. the maximum continuous supply voltage is 16v. electrical specifica tions specifications with standard type are for an operating junction temperature of t j = t a = 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 the most likely parametric norm at t j = 25c, and are provided for reference purposes only. unless otherwise indicated, v in = v out + 1v and i out =10ma , c in = 6 .8 f, c out = 10 f , t a = 25 c. parameter min. typ. max. units conditions line regulation 0.06 0.5 % i out =10ma, (v out +1v) v in 16v load regulation 0.2 1 % v in =v out + 1v, 10ma i out i fl (note 2) v/t 20 100 ppm/ ?c ? v out temp coefficient (note 6) dropout voltage (note 3) 120 300 mv ? i out =100ma 380 i out =1.5a 525 650 ? i out =2.5a, xrp29302a only 600 800 ? i out =3a ground current (note 5) 30 60 ma ? i out =1.5a 40 i out =3a ground pin current at dropout 0.9 ma v in = 0.5v less than specified v out i out =10ma current limit 3.0 4.5 a v out =0v (note 4) output noise voltage 400 v rms 10hz - 100khz, i out =100ma, c out =10f 260 10hz - 100khz, i out =100ma, c out =33f reference voltage 1.228 1.24 1.252 v 1.215 1.265 v ? adjust pin bias current 40 80 na 120 ? reference voltage temperature coefficient 20 ppm/ ?c note 7 adjust pin bias current temperature coefficient 0.1 na/ ?c enable input input logic voltage low (off) 0.8 v ? v in <10v input logic voltage high (on) 2.4 ? enable input pin 100 600 a v en =16v 750 ? 1 ? v en =0.8v 2 ? regulator output current in shutdown 10 500 a ? note 8 note 2: full load current (i fl ) is defined as 3.0a. note 3: dropout voltage is defined (v in - v out ) when the output voltage drops to 99% of its nominal value. note 4: v in =v out (nom ) +1v . use pulse - testing procedures to minimize temperature rise.
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 3 / 9 rev. 1.3.0 note 5: ground pin current is the regulator quiescent current. the total current drawn from the source is the sum of the load current to the ground current. note 6: output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range note 7: thermal regulation is defined as the change in output voltage at time t after a change in power dissipation is applied, excluding load/line regulation effects. specifications for a 200ma load pulse as v in =20v (a 4w pulse) for t=10ms. note 8 : v en 0.8v and v in 16v, v out = 0. block diagram fig. 2 : xrp29302 block diagram pin assign ment fig. 3 : xrp29302 pin assign ment
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 4 / 9 rev. 1.3.0 ordering information part number junction temperature range marking package packing quantity note 1 note 2 xrp29302et - l - 40c t j +125c xrp29302 e yyww x 5 - pin to220 bulk lead free xrp29302etb - l - 40c t j +125c xrp29302 e yyww x 5 - pin to263 bulk lead free xrp29302etbtr - l - 40c t j +125c xrp29302 e yyww x 5 - pin to263 500 /tape & reel lead free xrp29302aetb - l - 40c t j +125c xrp29302e yyww x 5 - pin to263 bulk lead free adjustable xrp29302aetbtr - l 500/tape & reel yy = year C ww = work week C x = lot number note: xrp29302aetb - l has the same package marking as xrp29302etb - l. the a designator is only provided on the packaging label.
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 5 / 9 rev. 1.3.0 typical performance characteristics all data taken at v in = v out + 1v , t j = t a = 25c, unless otherwise specified. fig. 4 : dropout voltage vs load current fig. 5 : startup fig. 6 : line regulation i out =10ma, v out =3.3v fig. 7 : load regulation v out =3.3v
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 6 / 9 rev. 1.3.0 theory of operation the xrp29302 incorporates protection against over - current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. t hermal c onsiderations although the xrp29302 offers limiting circuitry for overload conditio ns, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. heat will flow through the lowest resistance path, the junction - to - case path. in order to insure the best thermal flow of the component, proper mo unting is required. to - 220 d esign e xample : assume that v in = 10v, v out = 5v, i out = 1.5a, t a = 50c, ha = 1c/w, ch = 2c/w, and jc = 3c/w, where: t a = ambient temperature, ha = heatsink to ambient thermal resistance ch = case to heatsink thermal resista nce jc = junction to case thermal resistance the power calculated under these conditions is: ? ? = ( ? ?? ? ? ??? ) ? ??? = 7.5? and the junction temperature is calculated as ? ? = ? ? + ? ? ? ? ?? + ? ?? + ? ?? ? or ? ? = 50 + 7.5 ( 1 + 2 + 3 ) = 95 ? reliable operation is insured. c apacitor r equirements the output capacitor is needed to insure stability and minimize the output noise. the value of the capacitor varies with the load. however, a minimum value of 10f aluminum capacitor will guarantee stability ove r all load conditions. a tantalum capacitor is recommended if a faster load transient response is needed. if the power source has high ac impedance, a 0.1f ceramic capacitor between input & ground is recommended. m inimum l oad c urrent to ensure a proper b ehavior of the regulator under light load, a minimum load of 5ma for xrp29302 is required. a djustable r egulator d esign the xrp29302 is an adjustable regulator that can be programmed to any value between 1.25v and 16v using 2 external resistors, r1 and r2. the relationship between the resistors and the output voltage is: ? 1 = ? 2 ? ? ??? 1. 240 ? 1? e nable i nput the xrp29302 has an enable function that switches the regulator on and off. their thresholds are ttl compatible. when the regulator is active, approximat ely 20 a flows through the enable pin. t ypical a pplication c ircuits figure 1 represents the typical implementation for an adjustable output regulator. the values of r1 and r2 set the output voltage value as follows: ? ??? = ? ??? ?1 + ? 1 ? 2 ? a minimum va lue of 10kohms is recommended for r2 with a range between 10k ? and 47k ? .
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 7 / 9 rev. 1.3.0 package specificatio n 5 - pin to263 *: dimension a (overall package thickness) is controlled to 0.181 maximum for xrp29302 only. typical dimension a guaranteed for any other device in a 5 - pin to263 is 0.190 inch maximum.
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 8 / 9 rev. 1.3.0 5 - p in to220
x x r r p p 2 2 9 9 3 3 0 0 2 2 3 3 a a 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 ? 2013 exar corporation 9 / 9 rev. 1.3.0 revision history revision date description 1.0.0 12/1 7 /2009 initial release of data s heet 1.1.0 12/23/2009 addition of esd data 1.2.0 10/19/2010 corrected adjustable regulator design paragraph equation 1.3.0 11/25 /2013 added xrp29302a with 2.5a dropout specification updated package outline drawing . ecn 1348 - 10 for further assistan ce email: customersupport@exar.com powertechsupport@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 9453 8 C 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 makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustrat ion purposes and may vary depending upon a users 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 use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. products are not authorized for use in suc h 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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