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ame, inc. 1 ame8808 750ma cmos ldo n typical application n functional block diagram l very low dropout voltage l guaranteed 750ma output l accurate to within 1.5% l 30 m a quiescent current l over-temperature shutdown l current limiting l short circuit current fold-back l space-saving sot-223 and dpak-2 package l factory pre-set output voltages l low temperature coefficient the ame8808 family of positive, linear regulators fea- ture low quiescent current (30 m a typ.) with low dropout voltage, making them ideal for battery applications. the space-saving sot-223 and dpak-2 packages are attrac- tive for "pocket" and "hand held" applications. these rugged devices have both thermal shutdown, and current fold-back to prevent device failure under the "worst" of operating conditions. the ame8808 is stable with an output capacitance of 2.2 m f or greater. l instrumentation l portable electronics l wireless devices l cordless phones l pc peripherals l battery powered widgets l electronic scales n general description n features n applications 2.2 m m m m f ame8808 out in c2 c1 1 m m m m f in gnd out 5v overcurrent shutdown thermal shutdown amp gnd out in r1 r2 v ref =1.215v
ame, inc. 2 750ma cmos ldo ame8808 part number marking output voltage package operating temp. range ame8808aegt aetyww 3.3v sot-223 - 40 o c to + 85 o c ame8808begt aeuyww 3.0v sot-223 - 40 o c to + 85 o c ame8808cegt aevyww 2.8v sot-223 - 40 o c to + 85 o c ame8808degt aewyww 2.5v sot-223 - 40 o c to + 85 o c ame8808eegt aexyww 3.8v sot-223 - 40 o c to + 85 o c ame8808fegt aeyyww 3.6v sot-223 - 40 o c to + 85 o c ame8808gegt aezyww 3.5v sot-223 - 40 o c to + 85 o c ame8808hegt afayww 2.7v sot-223 - 40 o c to + 85 o c ame8808iegt afbyww 3.4v sot-223 - 40 o c to + 85 o c ame8808jegt aguyww 2.85v sot-223 - 40 o c to + 85 o c ame8808kegt ahwyww 3.7v sot-223 - 40 o c to + 85 o c ame8808legt ajgyww 1.5v sot-223 - 40 o c to + 85 o c ame8808megt ajhyww 1.8v sot-223 - 40 o c to + 85 o c ame8808negt akuyww 2.9v sot-223 - 40 o c to + 85 o c ame8808oegt akvyww 3.1v sot-223 - 40 o c to + 85 o c n pin configuration ame8808 1. gnd 2. v out 3. v in sot-223 top view dpak-2 top view ame8808 1. gnd 2. v out (connected with heat sink) 3. v in n ordering information 13 2 ame8808 1 3 2 ame8808
ame, inc. 3 ame8808 750ma cmos ldo n ordering information (contd.) part number marking output voltage package operating temp. range ame8808aecs ame8808 aecs yyww 3.3v dpak-2 - 40 o c to + 85 o c ame8808becs ame8808 becs yyww 3.0v dpak-2 - 40 o c to + 85 o c ame8808cecs ame8808 cecs yyww 2.8v dpak-2 - 40 o c to + 85 o c ame8808decs ame8808 decs yyww 2.5v dpak-2 - 40 o c to + 85 o c AME8808EECS ame8808 eecs yyww 3.8v dpak-2 - 40 o c to + 85 o c ame8808fecs ame8808 fecs yyww 3.6v dpak-2 - 40 o c to + 85 o c ame8808gecs ame8808 gecs yyww 3.5v dpak-2 - 40 o c to + 85 o c ame8808hecs ame8808 hecs yyww 2.7v dpak-2 - 40 o c to + 85 o c ame8808iecs ame8808 iecs yyww 3.4v dpak-2 - 40 o c to + 85 o c ame8808jecs ame8808 jecs yyww 2.85v dpak-2 - 40 o c to + 85 o c ame8808kecs ame8808 kecs yyww 3.7v dpak-2 - 40 o c to + 85 o c ame8808lecs ame8808 lecs yyww 1.5v dpak-2 - 40 o c to + 85 o c ame8808mecs ame8808 mecs yyww 1.8v dpak-2 - 40 o c to + 85 o c
ame, inc. 4 750ma cmos ldo ame8808 part number marking output voltage package operating temp. range ame8808necs ame8808 necs yyww 2.9v dpak-2 - 40 o c to + 85 o c ame8808oecs ame8808 oecs yyww 3.1v dpak-2 - 40 o c to + 85 o c n ordering information (contd.) please consult ame sales office or authorized rep./distributor for other output voltage and package type availability. parameter rating unit supply voltage 4.5 to 5.5 v ambient temperature range - 40 to + 85 o c junction temperature - 40 to + 125 o c parameter maximum unit input voltage 8 v output current 1 a input, output voltage gnd - 0.3 to v dd + 0.3 v esd classification b n absolute maximum ratings n recommended operating conditions caution: stress above the listed absolute maximum rating may cause permanent damage to the device
ame, inc. 5 ame8808 750ma cmos ldo n thermal information maximum unit sot-223 160 dpak-2 60 sot-223 625 dpak-2 3,000 150 o c 300 o c parameter thermal resistance ( q jc ) maximum junction temperature maximum lead temperature (10 sec) o c / w internal power dissipation (p d ) ( d t = 100 o c) mw
ame, inc. 6 750ma cmos ldo ame8808 parameter symbol min typ max units input voltage v in note 1 7 v output voltage accuracy v o -1.5 1.5 % 1.3v<=v o(nom) <=1.4v 1900 1.4v1.2v v o >1.2v v o <0.8v i o =0ma i o =1ma to 750ma test condition i o =1ma see chart mv line regulation reg line i o =1ma v in =v o +1 to v o +2 % dropout voltage v dropout i o =750ma v o =v o(nom) -2.0% n electrical specifications ta = 25 o c unless otherwise noted note1: v in(min) =v out +v dropout note2: to prevent the short circuit current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied.
ame, inc. 7 ame8808 750ma cmos ldo the ame8808 family of cmos regulators contain a pmos pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. the p-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. during normal operation, the error ampli- fier compares the output voltage to a precision reference. over-current and thermal shutdown circuits become ac- tive when the junction temperature exceeds 150 o c, or the current exceeds 750ma. during thermal shutdown, the output voltage remains low. normal operation is re- stored when the junction temperature drops below 120 o c. the ame8808 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the ame8808 also incorpo- rates current foldback to reduce power dissipation when the output is short circuited. this feature becomes ac- tive when the output drops below 0.8 volts, and reduces the current flow by 65%. full current is restored when the voltage exceeds 0.8 volts. n detailed description n external capacitors the ame8808 is stable with an output capacitor to ground of 2.2 m f or greater. ceramic capacitors have the lowest esr, and will offer the best ac performance. con- versely, aluminum electrolytic capacitors exhibit the high- est esr, resulting in the poorest ac response. unfortu- nately, large value ceramic capacitors are comparatively expensive. one option is to parallel a 0.1 m f ceramic capacitor with a 10 m f aluminum electrolytic. the benefit is low esr, high capacitance, and low overall cost. a second capacitor is recommended between the in- put and ground to stabilize vin. the input capacitor should be at least 0.1 m f to have a beneficial effect. all capacitors should be placed in close proximity to the pins. a "quiet" ground termination is desirable. this can be achieved with a "star" connection.
ame, inc. 8 750ma cmos ldo ame8808 ground current vs. input voltage load step (1ma-600ma) drop out voltage vs. output voltage power supply rejection ratio line transient response safe operating area 0 0.05 0.1 0.15 0.2 0.25 0.3 2 2.5 3 3.5 4 4.5 5 5.5 i load =600ma drop out voltage (v) output voltage (v) output current (ma) input-output voltage differential (v) sot-223 dpak-2 75 o c rise w ith hs capable of twice q jc v out (10mv/div) v in (1v/div) time (200ms/div) c load =2.2 m f i load =1ma v outdc =3.3v v indc =4.5v ground current ( m m m m a) input voltage (v) 0 5 10 15 20 25 30 35 40 45 012345678 85 o c 25 o c psrr (db) 100ma 10ma 1ma 100 m a 100ma 100 m a c l =2.2 m f tantalum c byp =0 -80 -70 -60 -50 -40 -30 -20 -10 0 10 1k 100k frequency (hz) 10m time ( 20ms/div) i l (200ma/div) vo(10mv/div) i load out put c l =2. 2 m f ci n=2. 2 m f 0
ame, inc. 9 ame8808 750ma cmos ldo short circuit response overtemperature shutdown current limit response noise measurement time (20ms/div) vo (1mv div) c l =2.2 m f no filter v out (1v/div) i out (200ma/div) tim e (0.5sec/div) 0 0 r load =6.6 w i out (200ma/div) v out (1v/div) tim e (2ms/div) c load =2.2 m f c in =1.0 m f r load =3.3 w v outnom =3.3v tim e (2ms/div) c load =2.2 m f c in =1 m f r load <100m w v out (1v/div) i out (200mv/div)
ame, inc. 10 750ma cmos ldo ame8808 min max min max a 0.45 0.58 0.0177 0.0230 b 1.60 1.95 0.0630 0.0768 c 0.51 1.50 0.0201 0.0591 d 0.45 0.60 0.0177 0.0236 e 6.40 6.80 0.2520 0.2677 f 5.40 7.20 0.2126 0.2835 g 2.20 2.85 0.0866 0.1122 h - * 2.30 - * 0.0906 j - 0.97 - 0.0380 k 5.20 5.50 0.2047 0.2165 l 1.40ref 0.055ref symbols millimeters inches n package dimension to-252(dpak)-eiaj to-252(dpak)-jedc *: typical value notes: 1. controlling dimension: millimeters. 2. maximum lead thickness includes lead finish thickness mini- mum lead thickness is the minimum thickness of base material. c g f l top view side view e k b a d h j top view side view d c b a j f g l e k h min max min max a 0.49 0.51 0.0192 0.0201 b 1.79 1.81 0.0704 0.0713 c 0.55 - 0.0216 - d 0.49 0.51 0.0192 0.0201 e 6.58 6.62 0.259 0.2606 f 6.08 6.12 0.2393 0.2409 g 2.68 2.72 0.1055 0.1071 h j k 5.31 5.37 0.2090 0.2114 l 0.68 0.72 0.0267 0.0283 symbols millimeters inches * 2.30ref * 0.0906ref 0.96 0.0377 *: typical value notes: 1. controlling dimension: millimeters. 2. maximum lead thickness includes lead finish thickness mini- mum lead thickness is the minimum thickness of base material.
ame, inc. 11 ame8808 750ma cmos ldo n package dimension sot-223 c 13 o (4x) top view side view c d b1 h e e a1 b 13 o (4x) front view f min max min max a 1 0.02 0.10 0.0008 0.0039 b 0.60 0.84 0.0236 0.0330 b 1 2.90 3.15 0.1140 0.1240 c 0.24 0.38 0.0094 0.0150 d 6.30 6.71 0.2480 0.2640 e 3.30 3.71 0.1299 0.1460 e f 1.40 1.80 0.0560 0.0702 h 6.70 7.30 0.2638 0.2874 0 o 10 o 0 o 10 o 2.30 bsc 0.0906 bsc millimeters inches symbols
life support policy: these products of ame, inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of ame, inc. ame, inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ? ame, inc. , september 2003 document: 2006-ds8808-g corporate headquarter u.s.a (subsidiary) ame, inc. analog microelectronics, inc. 2f, 189 kang-chien road, nei-hu district 3100 de la cruz blvd., suite 201 taipei 114, taiwan, r.o.c. santa clara, ca. 95054-2046 tel: 886 2 2627-8687 tel : (408) 988-2388 fax: 886 2 2659-2989 fax: (408) 988-2489 www.ame.com.tw e-mail: sales@ame.com.tw

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