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mic29302a 3a fast - response ldo regulator super ?eta pnp is a registered trademark of micrel, inc. micre l inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com october 3 , 2014 revision 2.0 general description the mic29302a is a high - current, low - cost, low - dropout voltage regulator that uses micrel's proprietary super eta pnp ? process with a pnp pass element . t he 3a ldo regulator features 45 0mv (full load) dropout voltage and very low grou nd current. designed for high - current loads, these devices also find application s in lower current, low - dropout critical systems, where their dropout voltage s and ground current values are important attributes. along with a total accuracy of 2% (over temp erature, line , a nd load regulation) the regulator feature s very fast transient recovery from input voltage surges and output load current changes. the mic29302a has an adjustable output that can be set by two external resistors to a voltage between 1.24v a nd 15v. in addition, the device is fully protected against over current faults, reversed input polarity, reversed lead insertion, and overtemperature operation. a ttl logic enable (en) pin is available in the mic29302a to shutdown the regulator. when not us ed, the device can be set to continuous operation by connecting en to the input (in). the mic29302a is available in the standard and 5 - pin to - 263 and to - 252 packages with an operating junction temperature range of ? 40 c to +125c. data sheets and support do cumentati on can be found on micrel?s web site at: www.micrel.com . features ? high - current capability ? 3a over full temperature range ? low - dropout voltage of 45 0mv at full load ? low ground current ? accurate 1% guaranteed tol erance ? extremely fast transient response ? zero - current shutdown mode ? error flag signals output out - of - regulation ? a djustable output voltage ? packages: to - 263- 5l and to - 252- 5l applications ? processor peripheral and i/o supplies ? high - efficiency ?g reen? computer systems ? automotive electronics ? high - efficiency linear lower supplies ? battery - powered equipment ? pc add - in cards ? high - efficiency p ost - regulator for switching supply ____________________________________________________________________________ ______________ __ _____________________________ typical application ? ? ? ? ? ? + = 1 r2 r1 1.242 v out dropout voltage vs. output current 0 100 200 300 400 500 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) dropout voltage (mv) v in = 3.3v v adj = 0v t a = 25oc
micrel, inc. mic29302a october 3 , 2014 2 revision 2.0 ordering information part number voltage junction temp erature rang e package mic29302awu adj ustable ? 40c to +125 c 5 - pin to -263 mic29302awd adj ustable ? 40c to +125 c 5 - pin to -252 pin configuration 5 - pin to - 263 (d 2 pak) adjustable voltage (u) mic29302a wu 5 - pin to - 252 (d - pak) adjustable voltage (d) mic29302a wd pin description pin number t o -263 pin number t o -252 pin name p in function 1 1 en enable (input): act ive - high cmos compatible control input. do not float. 2 2 in input: unregulated input, +3 v to +16v maximum 3, tab 3, tab gnd gnd: tab is also connected internally to the ic?s ground on both packages. 4 4 out output: the regulator output voltage 5 5 adj feedback voltage: 1.24v feedback from external resistor divider.
micrel, inc. mic29302a october 3 , 2014 3 revision 2.0 absolute maximum ratings ( 1 ) input supply voltage (v in ) (1) ........................... ? 20v to +20v enable input voltage (v en ) ................................ ? 0.3v to v in lead temperature (soldering, 5 sec.) ........................ 260c power dissipation ..................................... internally limited storage temperature range .................... ? 65c to +150c esd rating all pins (3) operating ratings ( 2 ) o perating junction temperatu re .............. ? 4 0c to +125c operating input voltage ....................................... 3v to 16v package thermal resistance to - 263 ( jc ) ......................................................... 3 c/w to - 252 ( jc ) ......................................................... 3 c/w to - 252 ( ja ) ...................................................... 35 c/w to - 263 ( ja ) ....................................................... 28 c/w electrical characteristics ( 4 ) v in = 4.2v ; i out = 10 0 ma ; t a = 25 c, bold values indicate ? 40 ?&?7 j ??& , unless noted. parameter condition min . typ . max . units output voltage output voltage accuracy ( 5 ) 100 ma i out 3a , (v out + 1v) v in 16v ? 2 2 % line regulation i out = 10 0 ma, (v out + 1v) v in 16v 0. 1 0.5 % load regulation v in = v out + 1v, 10 0 ma i out 3a 0.2 1 % dropout voltage ( 6 ) i out = 100ma 80 200 mv i out = 750ma 220 i out = 1.5a 275 i out = 2.0a 375 630 i out = 2.5a 430 720 i out = 3a 450 800 ground current ground current i out = 750ma, v in = v out + 1v 5 20 ma i out = 1.5a 15 i out = 3a 60 150 i grnddo ground pin current @ dropout v in = 0.5v less than specified v out i out = 10ma 2 current limit v out = 0v ( 7 ) 3 4 a e n , output noise voltage (10hz to 100khz c l = 10f 400 v rms i l = 100ma c l = 33 f 260 ground pin current in shutdown input voltage v in = 16v 32 a notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handling precautions recommended. human body model, 1.5k ? in series with 100pf. 4. specification for packaged product only 5. output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature change. 6. dropout voltage is defined as the input - to - output differential when output voltage drops to 99% of its normal value with v out + 1v applied to v in . 7. v in =v out (nominal) + 1v. for example, use v in = 4.3v for a 3.3v regulator or use 6v for a 5v regulator. employ pulse testing procedure for current limit.
micrel, inc. mic29302a october 3 , 2014 4 revision 2.0 electrical character istics ( 4 ) (continued) v in = 4.2v ; i out = 10ma; t a = 25 c, bold values indicate ? 4 0c t j +125c, unless noted. reference reference voltage note 8 1.215 1.26 7 v adjust pin bias current 40 na 120 enable input input logic voltage low (off) 0.8 v high (on) 2.4 enable pin input current v en = 4.2 v 15 30 a 75 v en = 0.8v 2 4 regulator output current in shutdown note 10 10 a 20 notes: 8. v ref v out v in - 1 , 3v v out 16v, 10ma i l i fl , t j t jmax . 9. thermal regulation is defined as the change in the output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. specifications are for a 2 5 0ma load pulse at v in = 16v (a 4w pulse) for t = 10ms . 10. v en 0.8v, v in 16v and v out = 0v .
micrel, inc. mic29302a october 3 , 2014 5 revision 2.0 typical characteristics dropout voltage vs. input voltage 0 100 200 300 400 500 0 4 8 12 16 input voltage (v) dropout voltage (mv) i out = 3a i out = 1.0a gnd pin current vs. input voltage 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0 4 8 12 16 input voltage (v) ground current (ma) i out = 3a adjust pin voltage vs. input voltage 1.230 1.235 1.240 1.245 1.250 0 4 8 12 16 input voltage (v) adj pin voltage (v) v out = 1.8v i out = 3a adjust pin current vs. input voltage 40 42 44 46 0 4 8 12 16 input voltage (v) adj pin current (na) i load = 10ma load regulation vs. input voltage 0.000 0.100 0.200 0.300 0 4 8 12 16 input voltage (v) load regulation (%) v out = 1.8v i out = 10ma to 3a short-circuit current vs. input voltage 0 2 4 6 8 10 0 4 8 12 16 input voltage (v) current limit (a) v out = 0v enable pin current vs. input voltage 0.00 5.00 10.00 15.00 20.00 0 4 8 12 16 input voltage (v) enable pin current (a) v out = 1.8v i out = 10ma v en = v in output voltage vs. input voltage 1.240 1.241 1.242 1.243 0 4 8 12 16 input voltage (v) output voltage (v) v out = 1.24v i out = 10ma
micrel, inc. mic29302a october 3 , 2014 6 revision 2.0 typical characteristics (continued) gnd pin current vs. temperature 0.00 2.00 4.00 6.00 8.00 10.00 -50 -25 0 25 50 75 100 125 temperature (c) ground current (ma) v in =4.2v v out = 1.8v i out = 750ma 0 5 10 15 20 25 30 -50 -25 0 25 50 75 100 125 en pin current (na) temperature ( c) enable bias current vs. temperature v in = v en = 8v v out = 2.5v i out = 10ma dropout voltage vs. temperature 0 100 200 300 400 500 600 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage (mv) v in = 4.2v i out = 1.5a i out = 3a dropout voltage vs. temperature 0 100 200 300 400 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage (mv) v in = 4.2v i out = 750ma i out = 100ma short-circuit current vs. temperature 3.500 3.750 4.000 4.250 -50 -25 0 25 50 75 100 125 temperature (c) current limit (a) v in = 4.2v v out = 0v adjust pin voltage vs. temperature 1.235 1.238 1.240 1.243 -50 -25 0 25 50 75 100 125 temperature (c) adj pin voltage (v) v in =4.2v v out = 1.8v i out = 10ma adjust pin current vs. temperature 0 20 40 60 80 -50 -25 0 25 50 75 100 125 temperature (c) adj pin current (na) v in = 4.2v i load = 10ma line regulation vs. temperature 0.0 0.1 0.2 0.3 0.4 0.5 -50 -25 0 25 50 75 100 125 temperature (c) line regulation (%/v) v in = 3v to 16v v out = 1.8v i out = 10ma
micrel, inc. mic29302a october 3 , 2014 7 revision 2.0 typical characteristics (continued) dropout voltage vs. output current 0 100 200 300 400 500 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) dropout voltage (mv) v in = 3v v adj = 0v adjustable option dropout voltage vs. output current 0 100 200 300 400 500 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) dropout voltage (mv) v in = 4.2v v adj = 0v adjust pin voltage vs. output current 1.236 1.238 1.240 1.242 1.244 1.246 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) adj pin voltage (v) v in = 4.2v v out = 1.8v line regulation vs. output current -0.2 -0.1 0.0 0.1 0.2 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) line regulation (%) v in = 4.2v to 16v v out = 1.8v gnd pin current vs. output current 0 10 20 30 40 50 60 70 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output current (a) ground current (ma) v in = 4.2v v out = 1.8v output noise vs. frequency 0.001 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 frequency (khz) output noise (v/hz) noise spectral density v in =3.3v v out = 1.8v i out = 3a c out = 47f ripple rejection (i out = 10ma) vs. frequency 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) ripple rejection (db) gain (db) v in =3.3v v out = 1.8v i out = 10ma c out = 22f ripple rejection (i out = 1.5a) vs. frequency 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) ripple rejection (db) gain (db) v in =3.3v v out = 1.8v i out = 1.5a c out = 22f ripple rejection (i out = 3a) vs. frequency 0 10 20 30 40 50 60 70 80 0.01 0.1 1 10 100 1000 frequency (khz) ripple rejection (db) gain (db) v in =3.3v v out = 1.8v i out = 3a c out = 22f
micrel, inc. mic29302a october 3 , 2014 8 revision 2.0 functional characteristi cs figure 1 . mic29302a load transient response test circuit
micrel, inc. mic29302a october 3 , 2014 9 revision 2.0 functional diagram
micrel, inc. mic29302a october 3 , 2014 10 revision 2.0 application information the mic29302a is a high - performance , low - dropout voltage regulator suitable for all moderate to hi gh - current voltage regulat ion applications. its 45 0mv typical dropout voltage at full load make s it especially valuable in battery - powered systems and as hi gh efficiency noise filters in post - regulator applications. unlike older npn - pass transistor designs , where the minimum dropout voltage is limited by the base - emitter voltage drop and collector - emitter saturation voltage, dropout performance of the pnp output is limited merely by the low v ce saturation voltage. a trade - off for the low - dropout voltage is a varying base driver requirement. but micrel?s super ?eta pnp ? process reduces this drive requirement to merely 1% of the load current. the mic29302a regulator is fully protected from damage due to fault conditions. current limiting is linear; output curr ent under overload conditions is constant. thermal shutdown disables the device when the die temperature exceeds the + 125 c maximum safe operating temperature. the output structure of the regulators allows voltages in excess of the desired output voltage t o be applied without reverse current flow. the mic29302a offer s a logic - level on/off control . w hen disabled, the device draw s nearly zero current. figure 2 . linear regulators require only two capacitors for operation thermal design linear regulators are simple to use. the most complicated set of design parameters to consider are thermal characteristics. thermal design requires the following application - specific parameters: ? maximum ambient temperature, t a ? output current, i out ? o utput voltage, v out ? input voltage, v in first, we calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet : ( ) out in out d v 1.02v i p ? = where the ground current is approximated by 2% of i out . then the heat sink thermal resistance is determined with this formula: ( ) cs jc d a jmax sa p t t + ? ? = w here : t jmax 125c and cs is between 0 c/w and 2c/w. the heat sink may be significantly reduced in applications where the minimum input voltage is known and is large compared to the dropout voltage. a series input resistor can be used to drop excessive voltage and distribute the heat between this resistor and the regulator. the low - dropout properties of micrel super eta pnp ? regulators allow very significant reductions in regulator power diss ipation and the associated heat sink without compromising performance. whe n this technique is employed, a capacitor of at least 0.1f is needed directly between the input and regulator ground. please refer to application note 9 and application hint 17 on micrel?s website ( www.micrel.com ) fo r further details and exam ples on thermal design and heat sink specification. with no heat sink in the application, calculate the junction temperature to determine the maximum power dissipation that will be allowed before exceeding the maximum junction tempe rature of the mic29302a. the maximum power allowed can be calculated using the thermal resistance ( ja ) of the d - pak (to252) adhering to the followi ng criteria for the pcb design: 2 oz. copper and 100mm 2 copper area for the mic29302a. for example, given an expected maximum ambient temperature (t a ) of 75 c with v in = 3.3v, v out = 2.5v, and i out = 3 a, first calculate the expected p d using : ( ) ( ) ( ) 2.3472w 0.016a 3.3v 3a 2.5v 3.3v p d = ? ? =
micrel, inc. mic29302a october 3 , 2014 11 revision 2.0 next, calcualte the junction temperature for the expected power dissipation : t j = ( ja p d ) + t a = ( 35 c/w 2.3472 w) + 75 c = 1 57.15 c now determine the maximum power dissipation allowed that would not exceed the ic?s maximum junction temperature (125 c) without the use of a heat sink by : p d(max) = (t j(max) ? t a ) / ja = (125 c ? 75 c) / ( 35 c/w) = 1.428 w capacitor requirements for stability and minimum output noise, a capacitor on the regulator output is necessary. the value of this capacitor is dependent upon the output current; lower currents allow smaller capacitors. the mic29 302a is stable with a 10 f capacitor at full load . this capacitor need not be an expensive low - esr type ; aluminum electrolytics are adequate. in fact, extremely low - esr capacitors may contribute to instability. tantalum capacitors are recommended for systems where fast load trans ient response is important. whe n the regulator is powered from a source with high ac impedance, a 0.1f capacitor connected between i nput and gnd is recommended. transient response and 5v to 3.3v conversion the mic29302a has excellent response to variatio ns in input voltage and load current. by virtue of its low dropout voltage, the device does not saturate into dropout as readily as similar npn - based designs. a 3.3v output micrel ldo will maintain full speed and performance with an input supply as low as 4.2v, and will still provide some regulation with supplies down to 3.8v, unlike npn devices that require 5.1v or more for good performance and become nothing more than a resistor under 4.6v of input. micrel?s pnp regulators provide superior performance in ?5v to 3.3v? conversion applications than npn regulators, especially when all tolerances are considered. minimum load current the mic29302a regulator operates within a specified load range . if the output current is too small, leakage currents dominate and the output voltage rises. a minimum load current of 10ma is necessary for proper regulation and to swamp any expected leakage current across the operating temperature range . for best performance the total resistance (r1+r2) should be small enough to pass the minimum regulator load current of 1 0ma. adjustable regulator design the output voltage can be programmed anywhere between 1.25v and the 1 5v. two resistors are used. the resistor values are calculated by: ? ? ? ? ? ? ? ? ? = 1 1.240 v r r out 2 1 where v out is the desi red output voltage. figure 3 shows component definition. applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation (see ? minimum load cu rrent ? section). figure 3 . adjustable regulator with resistors enable input mic29302a features an enable (en) input that allows on/off control of the device. special design allows ?zero? current drain when the device is disabl ed ? only microamperes of leakage current flows. the en input has ttl/cmos compatible thresholds for simple interfacing with logic, or may be directly tied to v in . enabling the regulator requires approximately 20a of current into the en pin.
micrel, inc. mic29302a october 3 , 2014 12 revision 2.0 evaluation bo ard schematic
micrel, inc. mic29302a october 3 , 2014 13 revision 2.0 bill of materials item part number manufacturer description qty. c1 c2012x5r1e106k tdk ( 11 ) 10f, 25v, ceramic capacitor, x5r, 0805 1 c2,c3 b45196h4106k309 kemet ( 12 ) 10f, 20v, tantalum capacitor, 2312 2 tr3c106k020c0450 vishay ( 13 ) c5 eeu - fm1e 102 panasonic ( 14 ) 1000f, 25v, elect capacitor, through hol e, 10x22 - case 1 c6 t495d107k016ate125 kemet 100f, 20v, tantalum capacitor, 2917 1 tr3d107k016c0125 vishay r1 crcw06031k00fkta vishay 1 k , resistor, 1%, 0603 1 r2 open (crcw06031002frt1) vishay 10k , resistor, 1%, 0603 1 r3 crcw06038061frt1 vishay 8. 06 k , resistor, 1%, 0603 1 r4 crcw06034751frt1 vishay 4.75k , resistor, 1%, 0603 1 r5 crcw06033241frt1 vishay 3.24k , resistor, 1%, 0603 1 r6 crcw06031911rfrt1 vishay 1.91k, resistor, 1%, 0603 1 r7 crcw06030000fkta vishay 0?, resistor, 1%, 0603 1 r8 crcw 060350r0frt1 vishay 50?, resistor, 1%, 0603 1 u1 mic29302awu micrel ( 15 ) 3a fast - response ldo regulator 1 notes: 11. tdk: www.tdk.com . 12. kemet : www.kemet.com . 13. vishay: www.vishay.com . 14. panasonic.: www.panasonic.com . 15. micrel, inc .: www.micrel.com .
micrel, inc. mic29302a october 3 , 2014 14 revision 2.0 pcb layout recommendations mic2 9302 a evaluation board top layer mic2 9302 a evaluation board top silk
micrel, inc. mic29302a october 3 , 2014 15 revision 2.0 pcb layout recommendations (continued) mic2 9302 a evaluation board bottom layer mic2 9302 a evaluation board bottom silk
micrel, inc. mic29302a october 3 , 2014 16 revision 2.0 package information ( 16) 5 - pin to - 263 (u) note: 16. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. mic29302a october 3 , 2014 17 revision 2.0 package infor mation (continued) 5 - pin to - 252 (d)
micrel, inc. mic29302a october 3 , 2014 18 revision 2.0 micrel, inc. 2180 fortun e drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 1000 web http://www.micrel.com micrel, inc. is a leading global manufacturer of ic solutions for the worldwide high performance linear and power, lan, and timing & communications markets. the company?s products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switches, and physical layer transceiver ics. company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and comp uter products. corporation headquarters and state - of - the - art wafer fabricati on facilities are located in san jose, ca, with regional sales and support offices and advanced technology design centers situated throughout the americas, europe, and asia. additionally, the company maintains a n extensive network of distributors and reps worldwide. micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in th is datasheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. m icrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or oth erwise, to any intellectual property rights is granted by this document. except as pr ovided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property r ight. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where m alfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform ca n be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify micrel for any dam ages resulting from such use or sale. ? 2011 micrel, incorporated.

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