spx29300/01/02 3a low dropout voltage regulator december 2016 rev. 2.2.0 exar corporation www.exar.com 48720 kato road, fremont ca 94538, usa tel. +1 510 668 - 70 00 ? fax. +1 510 668 - 70 01 general description the spx29300/01/02 are 3a, highly accurate voltage regulator s with a low dropout voltage o f 600mv ( typical) at 3a. th ese regulator s are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. they are fully fault protected against over - current, reverse battery, and positive and negative voltage transients. on - chip trimming adjus ts the reference voltage to 1% initial accuracy. the spx29300 is offered in a 3 - pin to - 263 package, the spx29301 and spx29302 are offered in a 5 - pin to - 263 package . applications ? adjustable power supplies ? constant current regulators ? audio and video/graphi c cards ? battery chargers features ? 3a guaranteed 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 (spx29301/02) ? pow er good flag (spx29301) ? lea d free 3- pin to - 263 and 5- pin to- 263 package s typical application diagram fig. 1 : spx29300 and spx29302 application diagram s
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 2/ 10 rev. 2.2.0 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 rel iability. 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 - 263 -3 junction to ambient ........................ 31.4 c/w to - 263 - 5 junction to ambient ........................ 31.2c/w to - 263 - 3, to - 263 - 5 junction to case ................. 3c/w note 1 : maximum positive supply voltage of 20v must be of limited duration (<100ms) 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 fixed voltage versions output voltage, 1.8v version 1.782 1.800 1.818 v i out =10ma 1.764 1.800 1.836 ? 10mai 3a, 2.8vv 16v 10mai 3a, 3.5vv 16v 10mai out 3a, 4.3vv in 16v output voltage, 5.0v version 4.950 5.000 5.050 v i out =10ma 4.900 5.000 5.100 ? 10mai 3a, 6.0vv 16v all voltage versions line regulation 0.06 0.5 % i out =10ma, (v out +1v)v 16v + 1v, 10mai i v/t ppm/?c ppm/?c note 7 reference voltage and adjustable pin - spx29302 reference voltage 1.228 1.24 1.252 v 1.215 1.265 ? 1.203 1.277 v ref v out (v in - 1), 2.3vv in 16v 10mai l i fl , t j spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 3/ 10 rev. 2.2.0 parameter min. typ. max. units conditions adjust pin bias current temperature coefficient 0.1 na/?c power good flag output ? spx29301 output leakage current 0.01 1 a v oh =16v 2 ? output low voltage 220 300 mv device set for 5v, v in =4.5v, i ol =250a 400 ? upper threshold voltage 40 60 mv device set for 5v, note 8 25 ? lower threshold voltage 75 95 mv device set for 5v, note 8 140 ? hysteresis 15 mv device set for 5v, note 8 enable input ? spx29301/02 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 9 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. 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: comparator threshold is expressed in terms of a voltage differential at the adjust terminal below the nominal reference voltage measured 6v input. to express these thresholds in terms of output voltage change, multiply the error amplifier gain = v out /v ref = (r1 + r2)/r2. for example, at a programmable output voltage of 5v, the error output is guaranteed to go low when the output drops by 95mvx 5v/ 1.240v = 383mv. threshold remain constant as a percent of v out as v out is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. note 9 : v en 0.8v and v in 16v , v out = 0.
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 4/ 10 rev. 2.2.0 block diagram fig. 2 : spx29300/01/02 block diagram pin assign ment fig. 3 : spx29300/01/02 pin assign ment
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 5/ 10 rev. 2.2.0 ordering information part number operating temperature range lead - free package packing method spx29300t -l-1- 8/tr - 40ct +125c 40ct +125c 40ct +125c 40ct +125c 40ct +125c 40ct +125c 40ct +125c 40ct +125c 40ct +125c
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 6/ 10 rev. 2.2.0 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
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 7/ 10 rev. 2.2.0 theory of operation the spx29300/01/02 incorporate s protection against over - current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. t hermal c onsiderations although the spx29300/01/02 offers limiting circuitry for overl oad conditions, 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 componen t, proper mounting is required. to -2 63 d esign e xample : assume that v in = 5 v, v out = 3.3 v, i out = 1.0a, t a = 50c and ja = 3 1.4 c /w, where: t a = ambient temperature, ja = junction to ambient thermal resistance the power calculated under these conditions i s: ? ? = ( ? ?? ? ? ??? ) ? ??? = 1.7 ? and the junction temperature is calculated as ? ? = ? ? + ? ? ? ? ? or ? ? = 50 + 1.7 31 .4 = 103 . 4 ? 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 over 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 behavior of the regulator under light load, a minimum load of 5ma for spx29300/01/02 is required. a djustable r egulator d esign the spx29300/01/02 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 resi stors and the output voltage is: ? 1 = ? 2 ? ? ??? 1. 240 ? 1? e rror f lag the spx29301 features an error flag that indicates either an over current or under current voltage condition. the flag output goes low, sinking 10ma when either conditions occurs. e nable i nput the spx29301/02 has an enable function that switches the regulator on and off. their thresholds are ttl compatible. when the regula tor is active, approximately 20 a flows through the enable pin. t ypical a pplication c ircuits figure 1 represents the typ ical implementation for an adjustable output regulator. the values of r1 and r2 set the output voltage value as follows: ? ??? = ? ??? ? 1 + ? 1 ? 2 ? a minimum value of 10kohms is recommended for r2 with a range between 10k ? and 47k ? .
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 8/ 10 rev. 2.2.0 package specificatio n 3-p in and 5- pin to - 263
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 9/ 10 rev. 2.2.0 package specificatio n continued
spx29300/01/02 3a low dropout voltage regulator ? 2016 exar corporation 10/ 10 rev. 2.2.0 revision history revision date description 1.0.0 12/1 7 /2009 initial release of data s heet 2.0.0 03/31/2010 reformat of datasheet inserted esd data modified dropout voltage and ground current values in electrical characteristics table corrected typographical error in result of calculus in note 8 removed ?g ound c urrent vs l oad c urrent ? , ? enable threshold vs t emperature ? and ? power supply rejection ratio curves? updated ?dropout voltage vs load current?, ?line regulation? and ?load regulation? curves added ?start up? curve 2.1.0 10/19/2010 corrected adjustable regulator design paragraph equation 2.2.0 12/21/2016 updated package specification and ordering infor mation for further assistan ce technical support: powertechsupport@exar.com 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 makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration 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 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 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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