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MIC29302A 3a fast-response ldo regulator super ?eta pnp is a registered trademark of micrel, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com general description the MIC29302A is a high-cur rent, low-cost, low-dropout voltage regulator which uses micrel's proprietary super eta pnp ? process with a pnp pass element. the 3a ldo regulator features 450mv (full load) dropout voltage and very low ground current. designed for high-current loads, these devices also find applications in lower current, low dropout-critical systems, where their dropout voltage and ground current values are important attributes. along with a total accuracy of 2% (over temperature, line and load regulation) the regulator features very-fast transient recovery from input voltage surges and output load current changes. the MIC29302A has an adjustable output which can be set by two external resistors to a voltage between 1.24v to 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 used, the device can be set to continuous operation by connecting en to the input (in). the MIC29302A is avail able 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 documentation 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 450mv at full load ? low ground current ? accurate 1% guaranteed tolerance ? extremely-fast transient response ? zero-current shutdown mode ? error flag signals output out-of-regulation ? adjustable output voltage ? packages: to-263-5l and to-252-5l applications ? processor peripheral and i/o supplies ? high-efficiency ?green? computer systems ? automotive electronics ? high-efficiency linear lower supplies ? battery-powered equipment ? pc add-in cards ? high-efficiency lost-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 MIC29302A adjustable output regulator august 2011 m9999-080411-a
micrel, inc. MIC29302A august 2011 2 m9999-080411-a ordering information part number voltage junction temperature range package MIC29302Awu adjustable ?40c to +125 c 5-pin to-263 MIC29302Awd adjustable ?40c to +125 c 5-pin to-252 pin configuration 5-pin to-263 (d 2 pak) adjustable voltage (u) MIC29302Awu 5-pin to-252 (d-pak) adjustable voltage (d) MIC29302Awd pin description pin number to-263 pin number to-252 pin name pin name 1 1 en enable (input): active-high cmos compatible control input. do not float. 2 2 in input: unregulated in put, +2.8v to +16v maximum 3, tab 3, tab gnd gnd: tab is also connected internally to t he 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 august 2011 3 m9999-080411-a 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 (solde ring, 5sec .) ......................... 260c power dissipation .....................................in ternally limited storage temperature rang e ....................?65c to +150c esd rating all pins (3) operating ratings (2) operating junction temperature .............. ? 40c to +125c operating input vo ltage ....................................... 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 ).......................................................28c/w electrical characteristics (4) v in = 4.2v; i out = 100ma; t a = 25 c, bold values indicate ? 40c ? t j ? +125c, unless noted. parameter condition min. typ. max. units output voltage output voltage accuracy 100ma i out 3a, (v out + 1v) v in 16v ? 2 2 % line regulation i out = 100ma, (v out + 1v) v in 16v 0.1 0.5 % load regulation v in = v out + 1v, 100ma i out 3a 0.2 1 % v out = ? 1% (6) i out = 100ma 80 200 i out = 750ma 220 i out = 1.5a 275 dropout voltage i out = 3a 450 800 mv ground current i out = 750ma, v in = v out + 1v 5 20 i out = 1.5a 15 ground current i out = 3a 60 150 ma 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 i l = 100ma c l = 33 f 260 v (rms) ground pin current in s hutdown input voltage v in = 16v 32 a
micrel, inc. MIC29302A august 2011 4 m9999-080411-a electrical characteristics (4) (continued) v in = 4.2v; i out = 10ma; t a = 25 c, bold values indicate ? 40c t j +125c, unless noted. reference reference voltage (8) 1.215 1.267 v 40 adjust pin bias current 120 na enable input low (off) 0.8 input logic voltage high (on) 2.4 v 15 30 v en = 8v 75 2 enable pin input current v en = 0.8v 4 a 10 regulator output current in shutdown (10) 20 a notes: 1. exceeding the absolute maximu m rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handli ng precautions recommended. human body mo del, 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 w hen 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 3.3vregulator or use 6v for a 5v regul ator. employ pulse testing procedure for current limit. 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 a fter a change in power dissipation is applied , excluding load or line regulation effects. specifications are for a 250ma 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 august 2011 5 m9999-080411-a typical characteristics dropout voltage vs. input voltage 0 100 200 300 400 500 0481 2 input voltage (v) dropout voltage (mv) 1 6 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 0481 2 input voltage (v) ground current (ma) 1 6 i out = 3a adjust pin voltage vs. input voltage 1.230 1.235 1.240 1.245 1.250 0481 2 input voltage (v) adj pin voltage (v) 1 6 v out = 1.8v i out = 3a adjust pin current vs. input voltage 40 42 44 46 0481 2 input voltage (v) adj pin current (na) 1 6 i load = 10ma load regulation vs. input voltage 0.000 0.100 0.200 0.300 0481 2 input voltage (v) load regulation (%) 1 6 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 0481 2 input voltage (v) enable pin current (a) 1 6 v out = 1.8v i out = 10ma v en = v in output voltage vs. input voltage 1.240 1.241 1.242 1.243 0481 2 input voltage (v) output voltage (v) 1 6 v out = 1.24v i out = 10ma
micrel, inc. MIC29302A august 2011 6 m9999-080411-a 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 enable bias current vs. temperature (b06) 0 5 10 15 20 25 30 -50 -25 0 25 50 75 100 125 temperature (c) en pin current (na) 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 255075100125 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 august 2011 7 m9999-080411-a 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 a djustab le 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 august 2011 8 m9999-080411-a functional characteristics figure 2. MIC29302A load transient response test circuit
micrel, inc. MIC29302A august 2011 9 m9999-080411-a functional diagram
micrel, inc. MIC29302A august 2011 10 m9999-080411-a application information the MIC29302A is a high-performance, low-dropout voltage regulator suitable for all moderate to high-current voltage regulation applications. its 450mv typical dropout voltage at full load makes it especially valuable in battery-powered systems and as high 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 current under overload conditions is constant. thermal shutdown disables the device when the die temperature exceeds the 125 c maximum safe operating temperature. the output st ructure of the regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. the MIC29302A offer a logic level on/off control: when disabled, the devices draw nearly zero current. figure 3. 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 ? output 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 outd v 1.02vip ? = where the ground current is approximated by 2% of i out . then the heat sink thermal resistance is determined with this formula: () csjc d a jmax sa ? p tt +? ? = where: t jmax 125c and cs is between 0 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 dissipation and the associated heat sink without compromising performance. when 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 ) for further details and examples 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 a llowed before exceeding the maximum junction temperature of the MIC29302A. the maximum power allowed can be calculated using the thermal resistance ( ja ) of the d-pak (to252) adhering to the following 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 = 1.5a, first calculate the expected p d using: ( )()() 2.3472w 0.016a 3.3v3a2.5v 3.3vp d = ??=
micrel, inc. MIC29302A august 2011 11 m9999-080411-a for best performance the total resistance (r1+r2) should be small enough to pass the minimum regulator load current of 10ma. next, calcualte the junction temperature for the expected power dissipation: t j = ( ja p d ) + t a = (35 c/w 2.3472w) + 75 c = 157.15 c adjustable regulator design the output voltage can be programmed anywhere between 1.25v and the 15v. two resistors are used. the resistor values are calculated by: 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: ? ? ? ? ? ? ? ? ?= 1 1.240 v rr out 21 p d(max) = (t j(max) ? t a ) / ja = (125 c ? 75 c) / (35 c/w) where v out is the desired output voltage. = 1.428w capacitor requirements figure 4 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 current? section). 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 MIC29302A 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 transient response is important. when the regulator is powered from a source with high ac impedance, a 0.1f capacitor connected between input and gnd is recommended. transient response and 5v to 3.3v conversion the MIC29302A has excellent response to variations in input voltage and load current. by virtue of its low dropout voltage, the device does not saturate into dropout as readily as simila r 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 regulator s, especially when all tolerances are considered. figure 4. 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 disabled?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. 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.
micrel, inc. MIC29302A august 2011 12 m9999-080411-a evaluation board schematic
micrel, inc. MIC29302A august 2011 13 m9999-080411-a bill of materials item part number manufacturer description qty. c2012x5r0j106k tdk (1) grm2196r60j106k murata (2) c1 08056d106kat2a vishay (3) 10f, 6.3v, ceramic capacitor, x5r, 0805 1 b45196h4106k309 kemet (4) c2,c3 tr3c106k020c0450 vishay (3) 10f, 20v, tantalum capacitor, 2312 2 c5 eeu-fm1c102 panasonic (5) 1000f, 16v, elect capacitor, through hole, 10x20-case 1 t495d107k016ate125 kemet (4) c6 tr3d107k016c0125 vishay (3) 100f, 20v, tantalum capacitor, 2917 1 r1 crcw06031k00fkta vishay (3) 1k, resistor, 1%, 0603 1 r2 open (crcw06031002frt1) vishay (3) 10k, resistor, 1%, 0603 1 r3 crcw06038061frt1 vishay (3) 8.06k, resistor, 1%, 0603 1 r4 crcw06034751frt1 vishay (3) 4.75k, resistor, 1%, 0603 1 r5 crcw06033241frt1 vishay (3) 3.24k, resistor, 1%, 0603 1 r6 crcw06031911rfrt1 vishay (3) 1.91k, resistor, 1%, 0603 1 r7 crcw06030000fkta vishay (3) 0 ? , resistor, 1%, 0603 1 r8 crcw060350r0frt1 vishay (3) 50? , resistor, 1%, 0603 1 u1 MIC29302Awu micrel (6) 3a fast-response ldo regulator 1 notes: 1. tdk: www.tdk.com . 2. murata: www.murata.com . 3. vishay: www.vishay.com . 4. kemet: www.kemet.com . 5. panasonic.: www.panasonic.com . 6. micrel, inc .: www.micrel.com .
micrel, inc. MIC29302A august 2011 14 m9999-080411-a pcb layout recommendations MIC29302A evaluation board top layer MIC29302A evaluation board top silk
micrel, inc. MIC29302A august 2011 15 m9999-080411-a pcb layout recommendations (continued) MIC29302A evaluation board bottom layer MIC29302A evaluation board bottom silk
micrel, inc. MIC29302A august 2011 16 m9999-080411-a package information 5-pin to-263 (u)
micrel, inc. MIC29302A august 2011 17 m9999-080411-a package information (continued) 5-pin to-252 (d)
micrel, inc. MIC29302A august 2011 18 m9999-080411-a recommended landing pattern 5-pin to-263 (u)
micrel, inc. MIC29302A august 2011 19 m9999-080411-a recommended landing pattern (continued) 5-pin to-252 (d)
micrel, inc. MIC29302A august 2011 20 m9999-080411-a micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or author ized for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life s upport 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 can be reasonably expected to result in a significan t 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 and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2011 micrel, incorporated.

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