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analog microelectronics, inc. 1 ame8804 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 detector (6 pin version only) l power-saving shutdown mode l space-saving sot-26 and sot-25 l adjustable output voltages l low temperature coefficient n n n n n general description the ame8804 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-26 and sot-25 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 sot-26 version also features a "power good" de- tector, which pulls low when the output is out of regula- tion. the ame8804 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 adj pg overcurrent shutdown thermal shutdown en v ref =1.215v v ref x90% v ref x110% ame8804 out in c3 2.2 m f gnd adj 5v out in en c2 100p r1 r2 c1 1 m f pg v out = 1.215 (r1 +r2)/r2 c2 is unnecessary when r1 or r2 < 20k pg pin is only available in the sot-26 package option
analog microelectronics, inc. 2 300ma cmos ldo ame8804 n n n n n pin configuration sot-26 top view 1. v in 4. pg 2. gnd 5. adj 3. en 6. v out n n n n n ordering information 1. v in 4. adj 2. gnd 5. v out 3. en sot-25 top view 4 5 12 3 4 5 1 2 3 6 part number marking output voltage package operating temp. range AME8804AEEY aauww adjustable sot-26 -40 o c to +85 o c ame8804aeev ajcww adjustable sot-25 -40 o c to +85 o c please consult ame sales office or authorized rep./distributor for other package type availability.
analog microelectronics, inc. 3 ame8804 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 caution: stress above the listed absolute rating may cause permanent damage to the device parameter maximum unit input voltage 8 v output current p d / (v in - v o ) ma 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 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 thermal resistance ( q ja ) sot-26 260 o c / w internal power dissipation (p d ) ( d t = 100 o c) sot-26 380 mw 150 o c 300 o c maximum lead temperature ( 10 sec) maximum junction temperature parameter
analog microelectronics, inc. 4 300ma cmos ldo ame8804 n n n n n electrical specifications ta = 25 0 c v in =5v unless otherwise noted parameter symbol min typ max units input voltage v in note 1 7 v output voltage accuracy v o -1.5 1.5 % 1.5v= 2.0v 0.02 0.1 % load regulation reg load 0.2 1 % over temerature shutdown ots 150 o c over temerature hysterisis oth 30 o c v o temperature coefficient tc 30 ppm/ o c f=1khz 50 psrr f=10khz 20 db f=100khz 15 adj input bias current i adj 1 m a adj reference voltage v ref 1.203 1.215 1.227 v 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 shutdown output voltage v o , sd 00.1v output under voltage v uv 85 %v o(nom) output over voltage v ov 115 %v o(nom) pg leakage current i lc 1 m a pg voltage rating v pg 7v pg voltage low v ol 0.4 v note1:v in(min) =v out +v dropout i sink =0.4ma co=2.2 m f30 v pg =7v v o in regulation i o =35 m a,v en 1.2v 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 test condition i o =1ma
analog microelectronics, inc. 5 ame8804 300ma cmos ldo n n n n n detailed description the ame8804 family of cmos regulators contain a pmos pass transistor, voltage reference, error ampli- fier, over-current protection, thermal shutdown, and power good detection circuitry. 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 ame8804 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the ame8804 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 ame8804 (sot-26 package only) includes the power good feature. normally, pin 4 is "floating", however, when the output is not within 10% of the specified volt- age, it pulls low. this can occur under the following con- ditions: 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 ame8804 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 0.1 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.
analog microelectronics, inc. 6 300ma cmos ldo ame8804 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 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 -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 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 ame8804 300ma cmos ldo line transient response 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) noise measurement time (20ms/div) vo (1mv/ div) 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 10 100 300 0.1 1.0 8.0 safe operating area output current (ma) input-output voltage differential (v) sot-25 sot-26 overtemperature shutdown v out (1v/div) i out (200ma/div) time (0.5sec/div) r load =6.6 w 0 0 current limit response v out (1v/div) i out (200ma/div) time (2ms/div) r load =3.3 w 0 0
analog microelectronics, inc. 8 300ma cmos ldo ame8804 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 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 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
analog microelectronics, inc. 9 ame8804 300ma cmos ldo r1(kohm) 1.00 2.00 5.00 10.00 20.00 50.00 100.00 200.00 500.00 1000.00 vout 1.30 14.29 28.59 71.47 142.94 285.88 714.71 1.35 9.00 18.00 45.00 90.00 180.00 450.00 1.40 6.57 13.14 32.84 65.68 131.35 328.38 1.45 5.17 10.34 25.85 51.70 103.40 258.51 517.02 1.50 4.26 8.53 21.32 42.63 85.26 213.16 426.32 852.63 1.55 3.63 7.25 18.13 36.27 72.54 181.34 362.69 725.37 1.60 3.16 6.31 15.78 31.56 63.12 157.79 315.58 631.17 1.65 2.79 5.59 13.97 27.93 55.86 139.66 279.31 558.62 1.70 2.51 5.01 12.53 25.05 50.10 125.26 250.52 501.03 1.75 2.27 4.54 11.36 22.71 45.42 113.55 227.10 454.21 1.80 2.08 4.15 10.38 20.77 41.54 103.85 207.69 415.38 1.85 1.91 3.83 9.57 19.13 38.27 95.67 191.34 382.68 1.90 1.77 3.55 8.87 17.74 35.47 88.69 177.37 354.74 1.95 1.65 3.31 8.27 16.53 33.06 82.65 165.31 330.61 826.53 2.00 1.55 3.10 7.74 15.48 30.96 77.39 154.78 309.55 773.89 2.05 1.46 2.91 7.28 14.55 29.10 72.75 145.51 291.02 727.54 2.10 1.37 2.75 6.86 13.73 27.46 68.64 137.29 274.58 686.44 2.15 1.30 2.60 6.50 12.99 25.99 64.97 129.95 259.89 649.73 2.20 1.23 2.47 6.17 12.34 24.67 61.68 123.35 246.70 616.75 2.25 1.17 2.35 5.87 11.74 23.48 58.70 117.39 234.78 586.96 2.30 1.12 2.24 5.60 11.20 22.40 55.99 111.98 223.96 559.91 2.35 1.07 2.14 5.35 10.70 21.41 53.52 107.05 214.10 535.24 2.40 1.03 2.05 5.13 10.25 20.51 51.27 102.53 205.06 512.66 2.45 0.98 1.97 4.92 9.84 19.68 49.19 98.38 196.76 491.90 2.50 0.95 1.89 4.73 9.46 18.91 47.28 94.55 189.11 472.76 2.55 0.91 1.82 4.55 9.10 18.20 45.51 91.01 182.02 455.06 2.60 0.88 1.75 4.39 8.77 17.55 43.86 87.73 175.45 438.63 877.26 2.65 0.85 1.69 4.23 8.47 16.93 42.33 84.67 169.34 423.34 846.69 2.70 0.82 1.64 4.09 8.18 16.36 40.91 81.82 163.64 409.09 818.18 2.75 0.79 1.58 3.96 7.92 15.83 39.58 79.15 158.31 395.77 791.53 2.80 0.77 1.53 3.83 7.67 15.33 38.33 76.66 153.31 383.28 766.56 2.85 0.74 1.49 3.72 7.43 14.86 37.16 74.31 148.62 371.56 743.12 2.90 0.72 1.44 3.61 7.21 14.42 36.05 72.11 144.21 360.53 721.07 2.95 0.70 1.40 3.50 7.00 14.01 35.01 70.03 140.06 350.14 700.29 3.00 0.68 1.36 3.40 6.81 13.61 34.03 68.07 136.13 340.34 680.67 3.05 0.66 1.32 3.31 6.62 13.24 33.11 66.21 132.43 331.06 662.13 3.10 0.64 1.29 3.22 6.45 12.89 32.23 64.46 128.91 322.28 644.56 r2(kohm)=(1.215*r1(kohm))/(vout-1.215) n n n n n external resistor divider table
analog microelectronics, inc. 10 300ma cmos ldo ame8804 r1(kohm) 1.00 2.00 5.00 10.00 20.00 50.00 100.00 200.00 500.00 1000.00 vout 3.15 0.63 1.26 3.14 6.28 12.56 31.40 62.79 125.58 313.95 627.91 3.20 0.61 1.22 3.06 6.12 12.24 30.60 61.21 122.42 306.05 612.09 3.25 0.60 1.19 2.99 5.97 11.94 29.85 59.71 119.41 298.53 597.05 3.30 0.58 1.17 2.91 5.83 11.65 29.14 58.27 116.55 291.37 582.73 3.35 0.57 1.14 2.85 5.69 11.38 28.45 56.91 113.82 284.54 569.09 3.40 0.56 1.11 2.78 5.56 11.12 27.80 55.61 111.21 278.03 556.06 3.45 0.54 1.09 2.72 5.44 10.87 27.18 54.36 108.72 271.81 543.62 3.50 0.53 1.06 2.66 5.32 10.63 26.59 53.17 106.35 265.86 531.73 3.55 0.52 1.04 2.60 5.20 10.41 26.02 52.03 104.07 260.17 520.34 3.60 0.51 1.02 2.55 5.09 10.19 25.47 50.94 101.89 254.72 509.43 3.65 0.50 1.00 2.49 4.99 9.98 24.95 49.90 99.79 249.49 498.97 3.70 0.49 0.98 2.44 4.89 9.78 24.45 48.89 97.79 244.47 488.93 3.75 0.48 0.96 2.40 4.79 9.59 23.96 47.93 95.86 239.64 479.29 3.80 0.47 0.94 2.35 4.70 9.40 23.50 47.00 94.00 235.01 470.02 3.85 0.46 0.92 2.31 4.61 9.22 23.06 46.11 92.22 230.55 461.10 3.90 0.45 0.91 2.26 4.53 9.05 22.63 45.25 90.50 226.26 452.51 3.95 0.44 0.89 2.22 4.44 8.88 22.21 44.42 88.85 222.12 444.24 4.00 0.44 0.87 2.18 4.36 8.73 21.81 43.63 87.25 218.13 436.27 4.05 0.43 0.86 2.14 4.29 8.57 21.43 42.86 85.71 214.29 428.57 4.10 0.42 0.84 2.11 4.21 8.42 21.06 42.11 84.23 210.57 421.14 4.15 0.41 0.83 2.07 4.14 8.28 20.70 41.40 82.79 206.98 413.97 4.20 0.41 0.81 2.04 4.07 8.14 20.35 40.70 81.41 203.52 407.04 4.25 0.40 0.80 2.00 4.00 8.01 20.02 40.03 80.07 200.16 400.33 4.30 0.39 0.79 1.97 3.94 7.88 19.69 39.38 78.77 196.92 393.84 4.35 0.39 0.78 1.94 3.88 7.75 19.38 38.76 77.51 193.78 387.56 4.40 0.38 0.76 1.91 3.81 7.63 19.07 38.15 76.30 190.74 381.48 4.45 0.38 0.75 1.88 3.76 7.51 18.78 37.56 75.12 187.79 375.58 4.50 0.37 0.74 1.85 3.70 7.40 18.49 36.99 73.97 184.93 369.86 4.55 0.36 0.73 1.82 3.64 7.29 18.22 36.43 72.86 182.16 364.32 4.60 0.36 0.72 1.79 3.59 7.18 17.95 35.89 71.79 179.47 358.94 4.65 0.35 0.71 1.77 3.54 7.07 17.69 35.37 70.74 176.86 353.71 4.70 0.35 0.70 1.74 3.49 6.97 17.43 34.86 69.73 174.32 348.64 4.75 0.34 0.69 1.72 3.44 6.87 17.19 34.37 68.74 171.85 343.71 4.80 0.34 0.68 1.69 3.39 6.78 16.95 33.89 67.78 169.46 338.91 4.85 0.33 0.67 1.67 3.34 6.69 16.71 33.43 66.85 167.13 334.25 4.90 0.33 0.66 1.65 3.30 6.59 16.49 32.97 65.94 164.86 329.72 4.95 0.33 0.65 1.63 3.25 6.51 16.27 32.53 65.06 162.65 325.30 5.00 0.32 0.64 1.61 3.21 6.42 16.05 32.10 64.20 160.50 321.00 r2(kohm)=(1.215*r1(kohm))/(vout-1.215) n n n n n external resistor divider table (contd.) note: small load (greater than 2 ma) is necessary as r1 or r2 is larger than 50 kohm. otherwise, output voltage probably cannot be pulled down to 0 v on disable mode.
analog microelectronics, inc. 11 ame8804 300ma cmos ldo n n n n n package dimension sot-26 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 sot-25 min max min max a 1.00 1.40 0.0394 0.0551 a 1 0.00 0.15 0.0000 0.0591 a2 0.70 1.25 0.0276 0.0492 b 0.35 0.50 0.0138 0.0197 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 0.35 - 0.0138 - q q q q 1 0 9 0 9 s 1 0.85 1.05 0.0335 0.0413 1.90 bsc 0.0748 bsc symbols m illim eters 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-ds8804-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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