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ame, inc. rev.a.01 1 ame8847 800ma cmos ldo n typical application n functional block diagram l very low dropout voltage l guaranteed 800ma 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 & sot-89 packages l factory pre-set output voltages l low temperature coefficient the ame8847 of positive, linear regulators feature low quiescent current (30 m a typ.) with low dropout voltage, making them ideal for battery applications. the space- saving sot-223 & sot-89 packages are attractive for "pocket" and "hand held" applications. these rugged devices have both thermal shutdown, and current fold-back to prevent device failure under the "worst" operating conditions. the ame8847 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 n general description n features n applications overcurrent shutdown thermal shutdown amp gnd out in r1 r2 v ref =1.215v l all ame' s lead free products meet rohs standards 2.2 m f ame8847 out in c2 c1 1 m f in gnd out 5v
ame, inc. 2 rev .a.01 800ma cmos ldo ame8847 n pin configuration sot -223 t op v iew ame8847aegt1. gnd 2. out (t ab) 3. in * die attach: non-conductive epoxy n ordering information operating ambient t e mperature ra nge ame8847 x x x x xxx x number of pinspa ck age t ype pin configuration special feature 1 3 2 a m e 8 8 4 7 1 3 2 a m e 8 8 4 7 sot -89 t op v iew ame8847aeft1. gnd 2. in (t ab) 3. out * die attach: non-conductive epoxy output v oltage a : 1 . g n d e : - 4 0 o c t o 8 5 o c f : s o t - 8 9 t : 3 1 8 0 : v = 1 . 8 v z : l e a d f r e e ( s o t - 8 9 ) 2 . i n g : s o t - 2 2 3 2 5 0 : v = 2 . 5 v 3 . o u t 3 3 0 : v = 3 . 3 v a : 1 . g n d ( s o t - 2 2 3 ) 2 . o u t 3 . i n s p e c i a l f e a t u r e p i n c o n f i g u r a t i o n o u t p u t v o l t a g e o p e r a t i n g a m b i e n t t e m p e r a t u r e r a n g e p a c k a g e t y p e n u m b e r o f p i n s
ame, inc. rev.a.01 3 ame8847 800ma cmos ldo n ordering information note: ww & yww represents the date code pls refer to date code rule on package dimension. * a line on top of the first letter represents lead free plating such as a8847 please consult ame sales office or authorized rep./distributor for output voltage and package type availability. part number marking* output voltage package operating ambient temperature range ame8847aeft180z a8847 a18ww 1.8v sot-89 - 40 o c to 85 o c ame8847aegt180z bhiyww 1.8v sot-223 - 40 o c to 85 o c AME8847AEFT250Z a8847 a25ww 2.5v sot-89 - 40 o c to 85 o c ame8847aegt250z bhjyww 2.5v sot-223 - 40 o c to 85 o c ame8847aeft330z a8847 a33ww 3.3v sot-89 - 40 o c to 85 o c ame8847aegt330z bfwyww 3.3v sot-223 - 40 o c to 85 o c
ame, inc. 4 rev.a.01 800ma cmos ldo ame8847 parameter symbol rating unit ambient temperature range t a - 40 to 85 o c junction temperature range t j - 40 to 125 o c storage temperature range t stg - 65 to 150 o c n absolute maximum ratings n recommended operating conditions caution: stress above the listed absolute maximum rating may cause permanent damage to the device. *hbm b:2000v~3999v n thermal information * measure q jc on backside center of tab. ** mil-std-202g 210f parameter maximum unit input voltage 8 v output current 1 a input, output voltage gnd - 0.3 to v in + 0.3 v esd classification b* parameter package die attach symbol maximum unit sot-89 46 sot-223 31 sot-89 180 sot-223 135 sot-89 550 sot-223 800 350 o c o c / w o c / w mw solder iron(10 sec)** thermal resistance* (junction to case) thermal resistance (junction to ambient) internal power dissipation non-conductive epoxy q jc q ja p d
ame, inc. rev.a.01 5 ame8847 800ma cmos ldo parameter symbol min typ max units input voltage v in note 1 7 v output voltage accuracy v out -1.5 1.5 % 1.8v <= v out(nom) <= 2.0v 1400 2.0v < v out(nom) <= 2.8v 1000 2.8v < v out(nom) 800 output current i out 800 ma output current limit i lim 900 ma output short circuit current i sc 400 800 ma quiescent current i q 30 50 m a ground pin current i gnd 35 m a 1.8v <= v out <= 2.0v -0.15 0.15 2.0v < v out < 4.0v -0.1 0.02 0.1 v out >= 4.0v -0.4 0.2 0.4 output voltage load regulation reg load 0.2 1 % thermal shutdown temperature t shdn 150 o c temperature hysterisis t hys 30 o c output voltage temperature coefficient t c 30 ppm/ o c f = 100hz 60 f = 1khz 50 f = 10khz 20 i out = 1ma v in = v out + 1 to v out + 2 see chart mv % i out = 1ma to 800ma v out >= 1.8v v out >= 1.8v v out < 0.8v i out = 800ma v out = v out(nom) - 2.0% i out = 0ma db psrr 30 m vrms test condition i out = 1ma output voltage noise e n i out = 100ma c out = 2.2 m f f = 10hz to 100khz i out = 10ma c out = 2.2 m f i out = 1ma to 800ma power supply ripple rejection dropout voltage v drop output voltage line regulation reg line n electrical specifications t a = 25 o c unless otherwise noted note1: v in(min) = v out + v drop 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. 6 rev.a.01 800ma cmos ldo ame8847 the ame8847 of cmos regulators contains 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 900ma. during thermal shutdown, the output voltage remains low. normal operation is re- stored when the junction temperature drops below 120 o c. the ame8847 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the ame8847 also incorpo- rates current foldback to reduce power dissipation when the output is short circuited. this feature becomes active 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 ame8847 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 ca- pacitor 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. rev.a.01 7 ame8847 800ma cmos ldo ground current vs. input voltage load step (1ma-800ma) dropout voltage vs. output voltage power supply ripple rejection ratio line transient response noise measurement g r o u n d c u r r e n t ( m a ) input voltage (v) 0 5 10 15 20 25 30 35 40 45 0 1 2 3 4 5 6 7 8 85 o c 25 o c 0 200 400 600 800 1000 1200 1400 1.8 2.5 3.3 4 5 output voltage (v) d r o p o u t v o l t a g e ( m v ) top to bottom i out = 800ma i out = 700ma i out = 600ma i out = 500ma i out = 400ma i out = 300ma i out = 200ma i out = 100ma p s r r ( d b ) 100ma 10ma 1ma 100 m a 100ma 100 m a c out = 2.2 m f tantalum -80 -70 -60 -50 -40 -30 -20 -10 0 10 1k 100k frequency (hz) 10m time (2ms/div) v o u t ( 1 m v / d i v ) v in = 5.0v c out = 2.2 m f v i n ( 1 v / d i v ) time (20ms/div) i o u t ( 5 0 0 m a / d i v ) v o u t ( 1 0 m v / d i v ) v out i out c out = 2.2 m f c in = 2.2 m f time (20ms/div) v o u t ( 1 m v / d i v ) c out = 2.2 m f no filter
ame, inc. 8 rev.a.01 800ma cmos ldo ame8847 short circuit response current limit response v o u t ( 1 v / d i v ) time (2ms/div) c out = 2.2 m f c in = 1.0 m f v out(nom) = 3.3v i o u t ( 5 0 0 m a / d i v ) time (2ms/div) i o u t ( 5 0 0 m v / d i v ) v o u t ( 1 v / d i v ) c out = 2.2 m f c in = 1 m f r load < 100m w
ame, inc. rev.a.01 9 ame8847 800ma cmos ldo year a a a w w xxx0 a a a w w xxx1 a a a w w xxx2 a a a w w xxx3 a a a w w xxx4 a a a w w xxx5 a a a w w xxx6 a a a w w xxx7 a a a w w xxx8 a a a w w xxx9 marking date code n date code rule n tape and reel dimension package carrier width (w) pitch (p) part per full reel reel size sot-89 12.00.1 mm 4.00.1 mm 1000pcs 1801 mm carrier tape, number of components per reel and reel size sot-89 w p pin 1 ame ame
ame, inc. 10 rev.a.01 800ma cmos ldo ame8847 package carrier width (w) pitch (p) part per full reel reel size sot-223 12.00.1 mm 4.00.1 mm 2500pcs 3301 mm n tape and reel dimension carrier tape, number of components per reel and reel size sot-223 w p pin 1 ame ame
ame, inc. rev.a.01 11 ame8847 800ma 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 0.01 0.10 0.0004 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 0.0551 0.0709 h 6.70 7.30 0.2638 0.2874 q 0 o 10 o 0 o 10 o 2.30 bsc 0.0906 bsc millimeters inches symbols sot-89 a h a 1 top view side view front view d d1 e e c polish polish matte finish s1 min max min max a 1.39 1.60 0.05472 0.06299 a 1 c 0.35 0.44 0.01378 0.01732 d 4.39 4.60 0.17283 0.1811 d 1 1.35 1.83 0.05315 0.07205 e 2.28 3.60 0.08976 0.14173 e h s1 3.00ref 0.70ref 1.50ref 0.1181ref 0.0276ref 0.0590ref 0.8ref 0.0315ref symbols millimeters inches
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. , july 2007 document: 2095-ds8847-a.01 corporate headquarter u.s.a. (subsidiary) ame, inc. analog microelectronics, inc. 2f, 302 rui-guang road, nei-hu district 3100 de la cruz blvd., suite 201 taipei 114, taiwan. 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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