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analog microelectronics, inc. 1 ame8802 300ma cmos ldo n n n n n typical application n n n n n functional block diagram n n n n n features l very low dropout voltage l guaranteed 300ma 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 good output function l power-saving shutdown mode l space-saving sot-25 (sot-23-5) l factory pre-set output voltages l low temperature coefficient n n n n n general description the ame8802 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-23-5 package is 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" of operating conditions. an additional feature is a "power good" detector, which pulls low when the output is out of regulation. the ame8802 is stable with an output capacitance of 2.2 m f or greater. n n n n n applications l instrumentation l portable electronics l wireless devices l cordless phones l pc peripherals l battery powered widgets l electronic scales amp gnd out in r1 r2 pg overcurrent shutdown thermal shutdown en v ref =1.215v ** v ref x90% v ref x110% ame8802 out in c2 2.2 m f c1 1 m f gnd out 5v en pg in ** if output voltage specification is lower than 1.215v, vref will be trimmed to 1.2v.
analog microelectronics, inc. 2 300ma cmos ldo ame8802 n n n n n pin configuration sot-25 top view 1. v in 4. pg 2. gnd 5. out 3. en n n n n n ordering information 5 4 12 3 part number marking output voltage package operating temp. range ame8802aeev aakww 3.3v sot-25 -40 o c to +85 o c ame8802beev aalww 3.0v sot-25 -40 o c to +85 o c AME8802CEEV aamww 2.8v sot-25 -40 o c to +85 o c ame8802deev aanww 2.5v sot-25 -40 o c to +85 o c ame8802eeev aaoww 3.8v sot-25 -40 o c to +85 o c ame8802feev abpww 3.6v sot-25 -40 o c to +85 o c ame8802geev acgww 3.5v sot-25 -40 o c to +85 o c ame8802heev aehww 2.7v sot-25 -40 o c to +85 o c ame8802ieev aepww 3.4v sot-25 -40 o c to +85 o c ame8802jeev agrww 2.85v sot-25 -40 o c to +85 o c ame8802keev ahtww 3.7v sot-25 -40 o c to +85 o c ame8802leev ajmww 1.5v sot-25 -40 o c to +85 o c ame8802meev ajnww 1.8v sot-25 -40 o c to +85 o c ame8802neev akqww 2.9v sot-25 -40 o c to +85 o c ame8802oeev akrww 3.1v sot-25 -40 o c to +85 o c ame8802teev arvww 1.2v sot-25 -40 o c to +85 o c ame8802ueev asdww 3.2v sot-25 -40 o c to +85 o c # represents the date code please consult ame sales office or authorized rep./d istributor for other output voltage and package type availability.
analog microelectronics, inc. 3 ame8802 300ma cmos ldo n n n n n absolute maximum ratings n n n n n recommended operating conditions n n n n n thermal information parameter maximum unit input voltage 8 v output current p d / (v in - v o )ma 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 maximum unit thermal resistance ( q ja ) sot-25 260 o c / w internal power dissipation (p d ) ( d t = 100 o c) sot-25 380 mw 150 o c 300 o c caution: stress above the listed absolute rating may cause permanent damage to the devic e maximum lead temperature ( 10 sec) maximum junction temperature parameter
analog microelectronics, inc. 4 300ma cmos ldo ame8802 n n n n n electrical specifications parameter symbol min typ max units input voltage v in note 1 7 v output voltage accuracy v o -1.5 1.5 % 1.2v1.2v v o <0.8v i o =0ma i o =1ma to 300ma i o =300ma v o =v onom -2.0% see chart mv v o >1.2v ta = 25 o c unless otherwise noted test condition i o =1ma %v o(nom) %v o(nom) output over voltage v ov 2.5v <=vo <= 5.0v 1.2v <= vo < 2.5v
analog microelectronics, inc. 5 ame8802 300ma cmos ldo n n n n n detailed description the ame8802 family of cmos regulators contain a pmos pass transistor, voltage reference, error ampli- fier, over-current protection, thermal shutdown, and power good function. the p-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. during normal operation, the error am- plifier compares the output voltage to a precision refer- ence. over-current and thermal shutdown circuits be- come active when the junction temperature exceeds 150 o c, or the current exceeds 300ma. during thermal shutdown, the output voltage remains low. normal op- eration is restored when the junction temperature drops below 120 o c. the ame8802 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the ame8802 also incor- porates current foldback to reduce power dissipation when the output is short circuited. this feature becomes active when the output drops below 0.8volts, and re- duces the current flow by 65%. full current is restored when the voltage exceeds 0.8 volts. n n n n 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 quiescent current is less than 1 m a. this pin behaves much like an electronic switch. n n n n n power good the ame8802 includes the power good feature. nor- mally, pin 4 is "floating", however, when the output is not within 10% of the specified voltage, it pulls low. this can occur under the following conditions: 1) input voltage too low. 2) during over-temperature. 3) during over-current. 4) if output is pulled up. n n n n n external capacitors the ame8802 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. conversely, aluminum electrolytic capacitors exhibit the highest esr, resulting in the poorest ac response. unfortunately, large value ceramic capacitors are com- paratively 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 over- all cost. a second capacitor is recommended between the input and ground to stabilize vin. the input capacitor should be at least 0.1uf 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.
analog microelectronics, inc. 6 300ma cmos ldo ame8802 0 50 100 150 200 250 300 2.5 2.75 3 3.25 3.5 3.75 4 drop out voltage vs output voltage output voltage (v) drop out voltage (mv) i load =300ma i load =200ma i load =100ma 0 50 100 150 200 250 0 50 100 150 200 250 300 drop out voltage vs load current load current (ma) dropout voltage (mv) top to bottom v out =2.5v v out =2.8v v out =3.0v v out =3.3v v out =3.5v v out =3.8v chip enable transient response output (1v/div) enable (2v/div) time ( 1ms/div) c l =2 m f r l =10 w c byp =1000pf 0 0 0 0 chip enable transient response time ( 1ms/div) c l =2 m f r l =10 w output (1v/div) enable (2v/div) 0 5 10 15 20 25 30 35 40 45 012345678 ground current vs. input voltage ground current ( m m m m a) input voltage (v) 85 o c 25 o c load step ( 1ma-300ma) i l (200ma/div) vo(5mv/div) time( 20ms/div) c l =2.2 m f c in =2.2 m f output i load 0
analog microelectronics, inc. 7 ame8802 300ma cmos ldo overtemperature shutdown v out (1v/div) i out (200ma/div) time (0.5sec/div) r load =6.6 w 0 0 -80 -70 -60 -50 -40 -30 -20 -10 0 1.0e+01 1.0e+03 1.0e+05 1.0e+07 power supply rejection ratio psrr (db) frequency (hz) 100ma 10ma 1ma 100 m a 100ma 100 m a c l =2.2 m f tantalum c byp =0 short circuit response time (2ms/div) v out (1v/div) i load (400ma/div) r load =100 w r short =0.1 w 0 0 current limit response v out (1v/div) i out (200ma/div) time (2ms/div) r load =3.3 w 0 0 noise measurement time (20ms/div) vo (1mv/ div) c l = 2.2 m f no filter
analog microelectronics, inc. 8 300ma cmos ldo ame8802 v in dc = 5.0v transient line response time (2ms/div) v o (1mv/div) v in (1v/div) 10 100 300 0.1 1.0 8.0 sot-23-5 safe operating area output current (ma) input-output voltage differential (v) 0.01 0.1 1 10 100 1000 10000 0 50 100 150 200 esr ( w w w w ) stable region untested region unstable region iload (ma) c l =1 m f stability vs. esr vs i load 0.01 0.1 1 10 100 1000 10000 0 50 100 150 200 iload (ma) stable region untested region unstable region esr ( w w w w ) c l =2 m f stability vs. esr vs i load 0.01 0.1 1 10 100 1000 10000 0 50 100 150 200 stable region untested region unstable region iload (ma) esr ( w w w w ) c l =3 m f stability vs. esr vs i load 0.001 0.01 0.1 1 10 100 1000 10000 0 50 100 150 200 stable region untested region unstable region iload (ma) esr ( w w w w ) c l =10 m f stability vs. esr vs i load
analog microelectronics, inc. 9 ame8802 300ma cmos ldo 27 28 29 30 31 32 33 34 35 -45 -5 25 55 85 temperature ( 0 c) quiescent current @ 5v (ua) quiescent current vs. temp. 0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 -45 -5 25 55 85 temperature ( 0 c) load regulation (%) load regulation vs. temp. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -45 -5 25 55 85 temperature ( 0 c) shut down current (ua) shut down current vs.temp. -0.50 -0.45 -0.40 -0.35 -0.30 -0.25 -0.20 -45 -5 25 55 85 temperature ( 0 c) en pin lo bias current (ua) en pin lo bias current vs.temp 150 160 170 180 190 200 210 220 -45-5 2555 85 temperature ( 0 c) dropout voltage @ 300ma (mv) dropout voltage vs. temp. 0.15 0.20 0.25 0.30 0.35 0.40 0.45 -45 -5 25 55 85 temperature ( 0 c) pg vol @ 0.4ma (v) pg vol vs.temp.
analog microelectronics, inc. 10 300ma cmos ldo ame8802 n n n n n package dimension sot-25 min max min max a 1.00 1.45 0.0394 0.0571 a 1 0.00 0.15 0.0000 0.0591 a2 0.70 1.25 0.0276 0.0492 b 0.35 0.55 0.0138 0.0217 c 0.08 0.25 0.0031 0.0098 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e h 2.60 3.00 0.1024 0.1181 l 0.30 - 0.0118 - q1 q1 q1 q1 0 10 0 10 s 1 0.85 1.05 0.0335 0.0413 1.90 bsc 0.07480 bsc symbols millimeters inches
life support policy: these products of analog microelectronics, inc. are not authorized for use as critical components in life- support devices or systems, without the express written approval of the president of analog microelectronics, inc. analog microelectronics, 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. ? analog microelectronics, inc., august 2001 document: 2006-ds8802-e corporate headquarters asia pacific headquarters analog microelectronics, inc. ame, inc. 3100 de la cruz blvd. suite 201 2f, 187 kang-chien road, nei-hu district santa clara, ca. 95054-2046 taipei 114, taiwan, r.o.c. tel : (408) 988-2388 tel : 886 2 2627-8687 fax: (408) 988-2489 fax : 886 2 2659-2989 www.analogmicro.com e-mail: info@analogmicro.com

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