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ame, inc. 1 ame8841 600ma cmos ldo n typical application n functional block diagram l very low dropout voltage l guaranteed 600ma 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 power-saving shutdown mode l space-saving so-8 package l many fixed output voltages available l low temperature coefficient the ame8841 linear regulator features low quiescent current (30 m a typ.) with low dropout voltage, making it ideal for battery applications. the space-saving so-8 package is attractive for "pocket and "hand held" appli- cations. these rugged devices have both thermal shutdown, and current fold-back to prevent device failure under the "worst" of operating conditions. the ame8841 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 amp gnd out in r1 r2 v ref =1.215v overcurrent shutdown thermal shutdown en ame8841 out in c2 2.2 m m m m f c1 1 m m m m f gnd out 5v en in
ame, inc. 2 600ma cmos ldo ame8841 n pin configuration ame8841 1. out 2. in 3. gnd 4. out 5. nc 6. nc 7. en 8. nc so-8 top view 1 3 24 ame8841 5 6 7 8 n ordering information operating temperature range number of pins package type product grade or option special feature ame8841 x x x x x a: 3.3v e: -40 o c to 85 o c h: so-8 a: 8 z: lead free b: 3.0v c: 2.8v d: 2.5v e: 3.8v f: 3.6v g: 3.5v h: 2.7v i: 3.4v j: 2.85v k: 3.7v l: 1.5v m: 1.8v n: 2.9v o: 3.1v r: 2.65v special feature product grade or option operating temperature range package type number of pins
ame, inc. 3 ame8841 600ma cmos ldo part number marking output voltage package operating temp. range ame8841aeha 8841 aeha yyww 3.3v so-8 - 40 o c to + 85 o c ame8841beha 8841 beha yyww 3.0v so-8 - 40 o c to + 85 o c AME8841CEHA 8841 ceha yyww 2.8v so-8 - 40 o c to + 85 o c ame8841deha 8841 deha yyww 2.5v so-8 - 40 o c to + 85 o c ame8841eeha 8841 eeha yyww 3.8v so-8 - 40 o c to + 85 o c ame8841feha 8841 feha yyww 3.6v so-8 - 40 o c to + 85 o c ame8841geha 8841 geha yyww 3.5v so-8 - 40 o c to + 85 o c n ordering information (contd.)
ame, inc. 4 600ma cmos ldo ame8841 part number marking output voltage package operating temp. range ame8841heha 8841 heha yyww 2.7v so-8 - 40 o c to + 85 o c ame8841ieha 8841 ieha yyww 3.4v so-8 - 40 o c to + 85 o c ame8841jeha 8841 jeha yyww 2.85v so-8 - 40 o c to + 85 o c ame8841keha 8841 keha yyww 3.7v so-8 - 40 o c to + 85 o c ame8841leha 8841 leha yyww 1.5v so-8 - 40 o c to + 85 o c ame8841meha 8841 meha yyww 1.8v so-8 - 40 o c to + 85 o c ame8841neha 8841 neha yyww 2.9v so-8 - 40 o c to + 85 o c ame8841oeha 8841 oeha yyww 3.1v so-8 - 40 o c to + 85 o c ame8841reha 8841 reha yyww 2.65v so-8 - 40 o c to + 85 o c please consult ame sales office or authorized rep./distributor for other output voltage and package type availability. n ordering information (contd.)
ame, inc. 5 ame8841 600ma cmos ldo maximum unit 123.7 o c / w 810 mw 150 o c 300 o c maximum lead temperature (10 sec) parameter thermal resistance ( q ja ) internal power dissipation (p d ) ( d t = 100 o c) maximum junction temperature n absolute maximum ratings n recommended operating conditions n thermal information caution: stress above the listed absolute maximum rating may cause permanent damage to the device parameter maximum unit input voltage 8 v output current p d / (v in - v o )a input, output voltage gnd - 0.3 to v in + 0.3 v esd classification b parameter rating unit ambient temperature range - 40 to + 85 o c junction temperature - 40 to + 125 o c
ame, inc. 6 600ma cmos ldo ame8841 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 1.4v= 4.0v -0.4 0.2 0.4 over temperature shutdown ots 150 o c over temperature hysterisis oth 30 o c v o temperature coefficient tc 30 ppm/ o c f=1khz 50 f=10khz 20 f=100khz 15 v eh 2.0 vin v v el 00.4v i eh 0.1 m a i el 0.5 m a shutdown supply current i sd 0.5 1 m a mvrms co=2.2 m f30 db v o >1.2v v o >1.2v i o =1ma test condition en f=10hz to 100khz i o =10ma,c byp =0 m f v in =2.7v to 7v v o <0.8v i o =0ma i o =1ma to 600ma v in =5v, v o =0v, v en ame, inc. 7 ame8841 600ma cmos ldo the ame8841 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 600ma. during thermal shutdown, the output voltage remains low. normal operation is re- stored when the junction temperature drops below 110 o c. the ame8841 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the ame8841 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 ame8841 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. n enable the enable pin normally floats high. when actively, pulled low, the pmos pass transistor shuts off, and all internal circuits are powered down. in this state, the qui- escent current is less than 1 m a. this pin behaves much like an electronic switch.
ame, inc. 8 600ma cmos ldo ame8841 ground current vs. input voltage load step (1ma-600ma) drop out voltage vs. output voltage power supply rejection ratio safe operating area noise measurement 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 10 100 600 0.1 1.0 8.0 output current (ma) input-output voltage differential (v) 8807aeha 8841aeha time (20ms/div) vo (1mv div) c l =2.2 m f no filter 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 0 200 400 600 800 1000 1200 12 34 5 6 i load =600ma drop out voltage (v) output voltage (v)
ame, inc. 9 ame8841 600ma cmos ldo short circuit response overtemperature shutdown current limit response chip enable transient response line transient response quiescent current vs. temp. v out (1v/div) i out (200ma/div) time (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) 0 0 time ( 1ms/div) c l =2 m f r l =10 w output (1v/div) enable (2v/div) v out (10mv/div) v in (1v/div) c load =2.2 m f i load =1ma v outdc =3.3v v indc =4.5v time (200ms/div) quiescent current (ua) temperature ( o c) 26 28 30 32 34 36 38 40 -20 0 20 40 60 80
ame, inc. 10 600ma cmos ldo ame8841 load regulation vs. temp. en pin vs. temp. shut down current vs. temp. dropout voltage vs. temp. v out vs. temp. -0.50 -0.45 -0.40 -0.35 -0.30 -0.25 -0.20 -20 0 20 40 60 80 en pin lo bias current (ua) temperature ( o c) 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 -20 0 20 40 60 80 shut down current (ua) temperature ( o c) 360 380 400 420 440 460 480 500 -20 0 20 40 60 80 dropout voltage @ 600ma (mv) temperature ( o c) 2.620 2.625 2.630 2.635 2.640 2.645 2.650 2.655 2.660 -20 0 20 40 60 80 vout @ vin=vout+2v (v) temperature ( o c) 0.30 0.35 0.40 0.45 0.50 0.55 -20 020406080 load regulation (%) temperature ( o c)
ame, inc. 11 ame8841 600ma cmos ldo n package dimension so-8 min max min max a 1.35 1.75 0.05315 0.0689 a 1 0.10 0.25 0.00394 0.00984 a2 b 0.33 0.51 0.01299 0.02008 c 0.19 0.25 0.00748 0.00984 d 4.80 5.00 0.18898 0.19685 e 3.80 4.00 0.14961 0.15748 e l 0.40 1.27 0.01575 0.05 y - 0.10 - 0.004 0 o 8 o 0 o 8 o 1.473 ref 0.058 ref 1.27 bsc 0.050 bsc symbols millimeters inches 7 o (4x) c top view side view front view d e l a a2 a1 e b c
life support policy: these products of ame, inc. are not authorized for use as critical components in life-support devices or sys- tems, 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. , november 2003 document: 2006-ds8841-f corporate headquarter u.s.a. (subsidiary) ame, inc. analog microelectronics, inc. 2f, no. 189 kang-chien road, nei-hu dist. 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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