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aat3237 da ta sheet 300ma micropower tm ldo with powerok 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 typical application aat3237 en in ou t pok gn d on/off 1f 2. 2f v in gnd gnd v out pok general description the aat3237 micropower low dropout (ldo) linear regu - lator is ideally suited for portable applications where low noise, extended battery life, and small size are critical. the aat3237 has been specifically designed for low out - put noise performance, fast transient response, and high power supply rejection ratio (psrr). other features include low quiescent current, typically 70a, and low dropout voltage, typically less than 400mv at full output current. the device is output short- circuit protected and has a thermal shutdown circuit for additional protection under extreme conditions. the aat3237 also features a low-power shutdown mode for extended battery life. a power-ok open-drain output signals when v out is in regulation. the aat3237 is available in a pb-free, space-saving 6-pin sot23 or 8-pin sc70jw package in 13 factory- programmed voltages: 1.2v, 1.5v, 1.8v, 2.0v, 2.3v, 2.5v, 2.7v, 2.8v, 2.85v, 2.9v, 3.0v, 3.3v, or 3.5v. features? low dropout: 400mv at 300ma ? guaranteed 300ma output ? high accuracy 1.5% ? 70a quiescent current ? high power supply ripple rejection ? power-ok (pok) output ? fast line and load transient response ? short-circuit protection ? over-temperature protection ? uses low equivalent series resistance (esr) ceramic capacitors ? shutdown mode for longer battery life ? low temperature coefficient ? 13 factory-programmed output voltages ? sot23 6-pin or sc70jw 8-pin package applications? cellular phones ? desktop computers ? digital cameras ? notebook computers ? personal portable electronics ? portable communication devices discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 pin descriptions pin number symbol function sot23-6 sc70jw-8 1 5, 6 in input voltage pin; should be decoupled with 1f or greater capacitor. 2, 5 8 gnd ground connection pin. 3 7 en enable pin; this pin should not be left loating. when pulled low, the pmos pass tr ansistor turns off and all internal circuitry enters low-power mode, consuming less than 1a. 4 1 pok power-ok output. this open-drain output is low when out is out of regulation. connect a pull-up resistor from pok to out. 6 2, 3, 4 out output pin; should be decoupled with 2.2f ceramic capacitor. pin configuration sot23-6 sc70jw-8 (top view) (top view) gnd outgnd pok en in 12 3 4 5 6 out out out gnden in in pok 12 3 45 6 7 8 discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions other than the operating conditions specified is not implied. 2. mounted on a demo board. 3. to calculate minimum input voltage, use the following equation: v in(min) = v out(max) + v do(max) as long as v in 2.5v. absolute maximum ratings 1 t a = 25c, unless otherwise noted. symbol description value units v in, pok input voltage, pok 6 v v enin(max) maximum en to input voltage 0.3 i out dc output current p d /(v in - v o ) ma t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec.) 300 thermal information 2 symbol description rating units q ja maximum thermal resistance (sot23-6, sc70jw-8) 150 c/w p d maximum power dissipation (sot23-6, sc70jw-8) 667 mw recommended operating conditions symbol description rating units v in input voltage 3 (v out + v do ) to 5.5 v t ambient temperature range -40 to +85 c discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 1. v do is defined as v in - v out when v out is 98% of nominal. 2. for v out < 2.1v, v do = 2.5v - v out . 3. c in = 10f. electrical characteristics v in = v out(nom) + 1v for v out options greater than 1.5v. v in = 2.5v for v out 1.5v. i out = 1ma, c out = 2.2f, c in = 1f, t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units v out output voltage tolerance i out = 1ma to 300ma t a = 25c -1.5 1.5 % t a = -40 to 85c -2.5 2.5 i out output current v out > 1.2v 300 ma v do dropout voltage 1, 2 i out = 300ma 400 600 mv i sc short-circuit current v out < 0.4v 600 ma i q ground current v in = 5v, no load, en = v in 70 125 a i sd shutdown current v in = 5v, en = 0v 1 d v out / v out * d v in line regulation 3 v in = v out + 1 to 5.0v 0.09 %/v d v out (line) dynamic line regulation v in = v out + 1v to v out + 2v, i out = 300ma, t r /t f = 2s 5 mv d v out (load) dynamic load regulation i out = 1ma to 300ma, t r <5s 60 v en(l) enable threshold low 0.6 v v en(h) enable threshold high 1.5 i en leakage current on enable pin v en = 5v 1 a v pok pok trip threshold v out rising, t a = 25c 90 94 98 % of v out v pokhys pok hysteresis 1 v pok(ol) pok output voltage low i sink = 1ma 0.4 v i pok pok output leakage current v pok < 5.5v, v out in regulation 1 a psrr power supply rejection ratio i out = 10ma 1khz 65 db 10khz 45 1mhz 42 t sd over-temperature shutdown threshold 145 c t hys over-temperature shutdown hysteresis 12 e n output noise 250 vrms tc output voltage temperature coeficient 22 ppm/c discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. dropout voltage vs. temperature 0 60 120 180 240 300 360 420 480 540 -4 0- 30 -2 0- 10 01 02 03040506070809 0 100 110 120 temperature (c) dropout voltage (mv) i l = 300ma i l = 150ma i l = 100ma i l = 50ma dropout characteristics 2.00 2.20 2.40 2.60 2.80 3.00 3.20 2.70 2.80 2.90 3.00 3.10 3.20 3.30 input voltage (v) output voltage (v) i out = 300ma i out = 150ma i out = 100ma i out = 50ma i out = 10ma i out = 0ma dropout voltage vs. output current 0 50 100 150 200 250 300 350 400 450 500 05 0 100 150 200 250 300 output current (ma) dropout voltage (mv) 85c 25c -40c ground current vs. input voltage 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 22 .5 33 .5 4.5 45 input voltage (v) ground current (a) i out = 0ma i out = 10ma i out = 50ma i out = 150ma i out = 300ma quiescent current vs. temperature 0 10 20 30 40 50 60 70 80 90 100 -4 0- 30 -2 0- 10 01 02 030405 06 07 08 09 0 100 110 120 temperature (c) quiescent current (a) output voltage vs. temperature 1.196 1.197 1.198 1.199 1.200 1.201 1.202 1.203 -4 0- 30 -2 0- 10 01 02 03 0405 06 07 08 09 01 00 temperature (c) output voltage (v) discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. turn-on time and pok delay time (10s/div) v enable (2v/div) v out (500mv/div) v pok (500mv/div) line transient response 2.85 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 time (100s/div) output voltage (v) -2 -1 0 1 2 3 4 5 6 input voltage (v) v in v out load transient response 2.60 2.65 2.70 2.75 2.80 2.85 2.90 time (100s/div) output voltage (v) -100 0 100 200 300 400 500 output current (ma) i out v out load transient response 300ma 2.10 2.20 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 time (10s/div) output voltage (v) -100 0 100 200 300 400 500 600 700 800 output current (ma) v out i out over-current protection -200 0 200 400 600 800 1000 1200 time (20ms/div) output current (ma) aat3237 self noise 0.01 0.1 1 10 0.01 0. 11 10 100 1000 frequency (khz) noise amplitude (v/rthz) discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. v en(h) and v en(l) vs. v in 1.050 1.075 1.100 1.125 1.150 1.175 1.200 1.225 1.250 2. 53 .0 3. 54 .0 4. 55 .0 5.5 v in (v) v en (v) v en(h) v en(l) discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 functional description the aat3237 is intended for ldo regulator applications where output current load requirements range from no load to 300ma. the advanced circuit design of the aat3237 provides excellent transient response and fast turn-on ability. the ldo regulator output has been specifically optimized to function with low-cost, low-esr ceramic capacitors. however, the design will allow for operation over a wide range of capacitor types. the aat3237 has an integrated power-ok comparator which indicates when the output is out of regulation. the device enable circuit is provided to shut down the ldo regulator for power conservation in portable prod - ucts. the enable circuit has an additional output capaci - tor discharge circuit to assure sharp application circuit turn-off upon device shutdown. this ldo regulator has complete short-circuit and ther - mal protection. the integral combination of these two internal protection circuits gives the aat3237 a compre - hensive safety system during extreme adverse operating conditions. device power dissipation is limited to the package type and thermal dissipation properties. refer to the thermal considerations section of this datasheet for details on device operation at maximum output cur - rent loads. functional block diagram ov er-current protectio n voltage reference 94% error amplifier over-temperature protectio n in pok en n ot discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 applications information to assure the maximum possible performance is obtained from the aat3237, please refer to the following applica - tion recommendations. input capacitor typically, a 1f or larger capacitor is recommended for c in in most applications. a c in capacitor is not required for basic ldo regulator operation. however, if the aat3237 is physically located more than three centime - ters from an input power source, a c in capacitor will be needed for stable operation. c in should be located as closely to the device v in pin as practically possible. c in values greater than 1f will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in . there is no specific capacitor esr requirement for c in . however, for 300ma ldo regulator output operation, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. output capacitor for proper load voltage regulation and operational stabil - ity, a capacitor is required between pins v out and gnd. the c out capacitor connection to the ldo regulator ground pin should be made as direct as practically pos - sible for maximum device performance. the aat3237 has been specifically designed to function with very low esr ceramic capacitors. for best perfor - mance, ceramic capacitors are recommended. typical output capacitor values for maximum output cur - rent conditions range from 1f to 10f. applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the aat3237 should use 2.2f or greater for c out . if desired, c out may be increased without limit. in low output current applications where output load is less than 10ma, the minimum value for c out can be as low as 0.47f. capacitor characteristics ceramic composition capacitors are highly recommended over all other types of capacitors for use with the aat3237. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counter - parts. a ceramic capacitor typically has very low esr, is lower cost, has a smaller pcb footprint, and is non- polarized. line and load transient response of the ldo regulator is improved by using low esr ceramic capaci - tors. since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. equivalent series resistance: esr is a very important characteristic to consider when selecting a capacitor. esr is the internal series resistance associated with a capac - itor that includes lead resistance, internal connections, size and area, material composition, and ambient tem - perature. typically, capacitor esr is measured in millio - hms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials: ceramic capacitors less than 0.1f are typically made from npo or c0g materi - als. npo and c0g materials generally have tight toler - ance and are very stable over temperature. larger capacitor values are usually composed of x7r, x5r, z5u, or y5v dielectric materials. these two material types are not recommended for use with ldo regulators since the capacitor tolerance can vary more than 50% over the operating temperature range of the device. a 2.2f y5v capacitor could be reduced to 1f over temperature; this could cause problems for circuit operation. x7r and x5r dielectrics are much more desirable. the temperature tolerance of x7r dielectric is better than 15%. capacitor area is another contributor to esr. capaci tors that are physically large in size will have a lower esr when compared to a smaller sized capacitor of an equiv - alent material and capacitance value. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller pack - age size. consult capacitor vendor datasheets carefully when selecting capacitors for ldo regulators. discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 pok output the aat3237 features an integrated power-ok compara - tor which can be used as an error flag. the pok open- drain output goes low when out is 6% below its nominal regulation voltage. connect a pull-up resistor from pok to out. enable function the aat3237 features an ldo regulator enable/disable function. this pin (en) is active high and is compatible with cmos logic. to assure the ldo regulator will switch on, the en turn-on control level must be greater than 2.0v. the ldo regulator will go into the disable shut - down mode when the voltage on the en pin falls below 0.6v. if the enable function is not needed in a specific application, it may be tied to v in to keep the ldo regula - tor in a continuously on state. when the ldo regulator is in shutdown mode, an inter - nal 1.5k w resistor is connected between v out and gnd. this is intended to discharge c out when the ldo regula - tor is disabled. the internal 1.5k w has no adverse effect on device turn-on time. short-circuit protection the aat3237 contains an internal short-circuit protection circuit that will trigger when the output load current exceeds the internal threshold limit. under short-circuit conditions, the output of the ldo regulator will be cur - rent limited until the short-circuit condition is removed from the output or ldo regulator package power dissi - pation exceeds the device thermal limit. thermal protection the aat3237 has an internal thermal protection circuit which will turn on when the device die temperature exceeds 145c. the internal thermal protection circuit will actively turn off the ldo regulator output pass device to prevent the possibility of over-temperature damage. the ldo regulator output will remain in a shut - down state until the internal die temperature falls back below the 145c trip point. the combination and interaction between the short-cir - cuit and thermal protection systems allows the ldo regulator to withstand indefinite short-circuit conditions without sustaining permanent damage. no-load stability the aat3237 is designed to maintain output voltage regulation and stability under operational no-load condi - tions. this is an important characteristic for applications where the output current may drop to zero. reverse output-to-input voltage conditions and protection under normal operating conditions, a parasitic diode exists between the output and input of the ldo regula - tor. the input voltage should always remain greater than the output load voltage, maintaining a reverse bias on the internal parasitic diode. conditions where v out might exceed v in should be avoided since this would forward bias the internal parasitic diode and allow excessive cur - rent flow into the v out pin, possibly damaging the ldo regulator. in applications where there is a possibility of v out exceeding v in for brief amounts of time during normal operation, the use of a larger value c in capacitor is highly recommended. a larger value of c in with respect to c out will effect a slower c in decay rate during shut - down, thus preventing v out from exceeding v in . in appli - cations where there is a greater danger of v out exceeding v in for extended periods of time, it is recommended to place a schottky diode across v in to v out (connecting the cathode to v in and anode to v out ). the schottky diode forward voltage should be less than 0.45v. discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on all part numbers listed in bold . ordering information output voltage package marking 1 part number (tape and reel) 2 1.2v sot23-6 aat3237igu-1.2-t1 1.5v sot23-6 aat3237igu-1.5-t1 1.8v sot23-6 aat3237igu-1.8-t1 2.0v sot23-6 aat3237igu-2.0-t1 2.3v sot23-6 aat3237igu-2.3-t1 2.5v sot23-6 aat3237igu-2.5-t1 2.7v sot23-6 aat3237igu-2.7-t1 3.3v sot23-6 hrxyy aat3237igu-3.3-t1 3.5v sot23-6 aat3237igu-3.5-t1 1.2v sc70jw-8 aat3237ijs-1.2-t1 1.5v sc70jw-8 aat3237ijs-1.5-t1 1.8v sc70jw-8 aat3237ijs-1.8-t1 2.0v sc70jw-8 aat3237ijs-2.0-t1 2.3v sc70jw-8 aat3237ijs-2.3-t1 2.5v sc70jw-8 aat3237ijs-2.5-t1 2.7v sc70jw-8 aat3237ijs-2.7-t1 2.8v sc70jw-8 aat3237ijs-2.8-t1 2.85v sc70jw-8 aat3237ijs-2.85-t1 2.9v sc70jw-8 aat3237ijs-2.9-t1 3.0v sc70jw-8 aat3237ijs-3.0-t1 3.3v sc70jw-8 aat3237ijs-3.3-t1 3.5v sc70jw-8 aat3237ijs-3.5-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?nition of green? , document number sq04-0074. discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 package information sot23-6 1.90 bsc 0.95 bsc 0.45 0.15 0.10 bsc 2.85 0.15 0.075 0.075 0.40 0.10 6 1.575 0.125 1.20 0.25 1.10 0.20 2.80 0.20 4 4 10 5 0.15 0.07 gauge plane 0.60 ref sc70jw-8 0.225 0.075 0.45 0.10 0.05 0.05 2.10 0.30 2.00 0.20 7 3 4 4 1.75 0.10 0.85 0.15 0.15 0.05 1.10 max 0.100 2.20 0.20 0.048ref 0.50 bsc 0.50 bsc 0.50 bsc all dimensions in millimeters. discontinued downloaded from: http:///
aat3237 da ta sheet 300ma micropower tm ldo with powerok 13 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202257a ? skyworks proprietary information ? products and product information are subject to cha nge without notice. ? august 9, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (skyworks) pr oducts or services. these materials, including the information contained herein, are provided by sky works as a service to its customers and may be used for informational purposes only by the customer. skyworks a ssumes no responsibility for errors or omissions in these materials or the information contained her ein. sky- works may change its documentation, products, services, speciications or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conlicts, incompatibilities, or other dificulties arising from any fut ure changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual prope rty rights by this document. skyworks assumes no liability for any materials, products or informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or ma terials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether e xpress, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual proper ty right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, i ncluding without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, o r other equipment in which the failure of the skyworks products could lead to personal injury, death , physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applicatio ns do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may dev iate from published speciications as a result of design defects, errors, or operation of products ou tside of pub- lished parameters or design speciications. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, custom er product design, or damage to any equipment resulting from the use of skyworks products outside of stated pub lished speciications or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identiication purposes only, and are the property of their respective owners. additional information , including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by refere nce. discontinued downloaded from: http:///

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