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analog microelectronics, inc. 1 ame1085 3a low dropout positive voltage regulator n n n n n applications l l l l l high efficiency linear regulators l l l l l post regulators for switching supplies l l l l l 5v to 3.3v voltage converter l l l l l battery charger n n n n n functional block diagram thermal protection bandgap reference current limiting amplifier input output adj/gnd error amp. n n n n n general description the ame1085 is a 3a low-dropout positive voltage regu- lator. it is available in fixed and adjustable output voltage versions. overcurrent and thermal protection are inte- grated onto the chip. output current will limit as it reaches the pre-set current or temperature limit. at full rated output current the dropout voltage is 1.4v (max.). ame1085 series regulators provide excellent regulation over line, load and temperature variations. n n n n n key features l low dropout voltage 1.2v typically at 3a l l l l l adjustable or 3.3v fixed voltage l l l l l line regulation typically 0.015% l l l l l load regulation typically 0.05% l l l l l adjust pin (adj) current less than 90 u a l l l l l overcurrent protection l l l l l thermal protection l l l l l available in to-220, to-263, to-252 figure 1 n n n n n typical application figure 2 ame1085 load 10 m f tan 10 m f tan 4.75v to 5.25v v in gnd v out
analog microelectronics, inc. 2 ame1085 3a low dropout positive voltage regulator to-252-2 front view 23 adj/ gnd v out v in n n n n n pin configuration ame1085 1 to-252-2 front view 1 2 3 ame 1085 adj/gnd v out v in to-263 front view 1 2 3 ame 1085 adj/gnd v out v in 1 2 3 ame 1085 adj/gnd v out v in to-263-2 front view
analog microelectronics, inc. 3 ame1085 3a low dropout positive voltage regulator n n n n n absolute maximum ratings n n n n n ordering information symbol maximum units v in 7v to-220 2.5 to-263 2.5 to-252 15 to-220 50 to-263 60 to-252 90 thermal resistance (junction to case) storage temperature range operating junction temperature range parameter 0 c q jc 0 c/w t lead 260 q ja thermal resistance (junction to ambient) lead temperature ( 10 sec ) input voltage t j 0 to 125 t stg -65 to 150 part number marking output voltage package ame1085acbt ame1085 acbt yyww adj to-220 AME1085DCBT ame1085 dcbt yyww 3.3 to-220 ame1085acdt-3 ame1085 acdt-3 yyww adj to-263-3 ame1085dcdt-3 ame1085 dcdt-3 yyww 3.3 to-263-3 ame1085acdt ame1085 acdt yyww adj to-263-2 ame1085dcdt ame1085 dcdt yyww 3.3 to-263-2 ame1085amct ame1085 amct yyww adj to-252-2 ame1085mct* ame1085 mct yyww 3.3 to-252-2 * this differs from our standard part numbering scheme due to historical precedent
analog microelectronics, inc. 4 ame1085 3a low dropout positive voltage regulator n n n n n electrical characteristics ame1085dxxx ame1085axxx parameter symbol min. typ. max. units reference voltage v in = 5v t j =25 0 c 1.238 1.262 (adjustable voltage) i o = 10ma over temp. 1.225 1.275 v in = 2.75 - 7v t j =25 0 c - 0.015 0.2 i o = 10ma over temp. - 0.035 0.2 v in = 5v t j =25 0 c - 0.05 0.3 i o = 10ma - 3a over temp. - 0.2 0.4 dropout voltage v in = 2.75 - 7v t j =25 0 c- 1.21.4 d v out , d v ref = 1% i o = 10ma - 3a over temp. - 1.3 - current limit i s 3.0 - - a temperature coefficient t c -0.005- %/ o c temperature stability t s v in = 5v, i o = 500ma, over temp. - 0.5 - % minimum load current i o -510ma rms output noise v n -0.003- %v 0 ripple rejection ratio r a v in = 5v, i o = 3a, over temp. 60 72 - db test conditions v ref 1.250 v line regulation reg line % load regulation reg load % v d v v in = 2.75 - 7v, over temp. v in = 2.75 - 7v, i o = 10ma - 3a v in = 5v t j =25 0 c parameter symbol min. typ. max. units output voltage v in = 5v t j =25 0 c 3.267 3.333 (fixed voltage) i o = 0a over temp. 3.234 3.366 v in =4.5 - 7v t j =25 0 c - 0.015 0.2 i o = 0a over temp. - 0.035 0.2 v in = 5v t j =25 0 c - 0.05 0.3 i o = 0a - 3a over temp. - 0.2 0.4 dropout voltage v in = 4.5 - 7v t j =25 0 c- 1.21.4 d v out , d v ref = 1% i o = 0a - 3a over temp. - 1.3 - current limit i s 3.0 - - a quiescent current (fixed model) temperature coefficient t c -0.005- %/ 0 c temperature stability t s v in = 5v, i o = 500ma, over temp. - 0.5 - % rms output noise v n -0.003- %v 0 ripple rejection ratio r a v in = 5v, i o = 3a, over temp. 60 72 - db test conditions vo 3.300 v line regulation reg line % load regulation reg load % v d v v in = 4.5 - 7v, over temp. i q v in = 5v, io=0a - 3a, over temp. - t j =25 0 c 12 13 ma v in = 4.5 - 7v, i o = 0a - 3a
analog microelectronics, inc. 5 ame1085 3a low dropout positive voltage regulator n n n n n application description 1. output voltage adjustment like most regulators, the ame1085 regulates the output by comparing the output voltage to an internally generated reference voltage. on the adjustable version, the v ref is available exter- nally as 1.25v between v out and adj. the voltage ratio formed by r1 and r2 should be set to conduct 10ma (minimum output load). the output voltage is given by the following equation: v out = v ref ( 1 + ) + i adj x r2 on fixed versions of ame1085, the voltage di- vider is provided internally. r2 r1 figure 3 2. thermal protection ame1085 has thermal protection which limits junction temperature to 150 o c. however, de- vice functionality is only guaranteed to a maxi- mum junction temperature of +125 o c. the power dissipation and junction temperature for ame1085 in to-220 package are given by p d = (v in - v out ) x i out t junction = t ambient + ( p d x q ja ) note: t junction must not exceed 125 o c 3. current limit protection ame1085 is protected against overload condi- tions. current protection is triggered at typi- cally 4.5a. 4. stability and load regulation ame1085 requires a capacitor from v out to gnd to provide compensation feedback to the internal gain stage. this is to ensure stability at the output terminal. typically, a 10 m f tanta- lum or 50 m f aluminum electrolytic is sufficient. note: it is important that the esr for this ca- pacitor does not exceed 0.5 w . the output capacitor dose not have a theoreti- cal upper limit and increasing its value will in- crease stability. c out = 100 m f or more is typi- cal for high current regulator design. for the adjustable version, the best load regu- lation is accomplished when the top of the resistor divider (r1) is connected directly to the output pin of the ame1085. when so con- nected, r p is not multiplied by the divider ratio. for fixed output versions, the top of r1 is in- ternally connected to the output and ground pin can be connected to low side of the load. figure 4 v out = v ref (1+ r2 r1 ) + i adj x r2 out adj in v ref i adj 50 m a v in v out r1 r2 c 1 out adj in v in r1 r2 r l r p parasitic line resistance connect r2 to load (connect r1 to case)
analog microelectronics, inc. 6 ame1085 3a low dropout positive voltage regulator 5. thermal consideration the ame1085 series contain thermal limiting cir- cuitry designed to protect itself for over-tempera- ture conditions. even for normal load conditions, maximum junction temperature ratings must not be exceed. as mention in thermal protection section, we need to considerall sources of ther- mal resistance between junction and ambient. it includes junction-to-case, case-to-heat-sink in- terface and heat sink thermal resistance itself. junction-to-case thermal resistance is specified from the ic junction to the bottom of the case directly below the die. proper mounting is re- quired to ensure the best possible thermal flow from this area of the package to the heat sink. the case of all devices in this series is electri- cally connected to the output. therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended.
analog microelectronics, inc. 7 ame1085 3a low dropout positive voltage regulator n n n n n advanced applications * v o = v ref ( 1 + ) + i adj x r2 ** optional for improved ripple rejection r2 r1 figure 5 adjustable output voltage * 20m w is ballast resistance the inter - connection of #18 wire could act as ballast resistance figure 6 paralleling regulators v in = 5v r1 r2 10 m f 10 m f 2k 1k 10 m f ** * v o = 1.5 - 3.45v ame1085 v out v in adj v in r1 r2 10 m f v o 10 m f i o = 0 to 6a * 20m w * 20m w ame1085 v out v in gnd ame1085 v out v in gnd
analog microelectronics, inc. 8 ame1085 3a low dropout positive voltage regulator n n n n n advanced applications (cont.) * v o = v ref + v z (v z : breakdown voltage of zener diode) ** optional for improved ripple rejection figure 7 regulator with reference figure 8 regulator with reverse diode protection v in 10 m f 10 m f 1k 10 m f ** ame1085 v out v in gnd 10 m f 100 m f v o * ame1085 v out v in gnd
analog microelectronics, inc. 9 ame1085 3a low dropout positive voltage regulator r1(ohm) 100 102 105 107 110 113 115 118 121 124 vout 1.25 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1.30 3.984 4.063 4.182 4.262 4.381 4.500 4.579 4.698 4.817 4.936 1.35 7.968 8.127 8.365 8.524 8.761 8.999 9.158 9.396 9.633 9.871 1.40 11.95 12.19 12.55 12.79 13.14 13.50 13.74 14.09 14.45 14.81 1.45 15.94 16.25 16.73 17.05 17.52 18.00 18.32 18.79 19.27 19.74 1.50 19.92 20.32 20.91 21.31 21.90 22.50 22.89 23.49 24.08 24.68 1.55 23.90 24.38 25.09 25.57 26.28 27.00 27.47 28.19 28.90 29.61 1.60 27.89 28.44 29.28 29.83 30.67 31.50 32.05 32.88 33.72 34.55 1.65 31.87 32.51 33.46 34.09 35.05 36.00 36.63 37.58 38.53 39.48 1.70 35.86 36.57 37.64 38.36 39.43 40.50 41.21 42.28 43.35 44.42 1.75 39.84 40.63 41.82 42.62 43.81 45.00 45.79 46.98 48.17 49.36 1.80 43.82 44.70 46.01 46.88 48.19 49.50 50.37 51.68 52.98 54.29 1.85 47.81 48.76 50.19 51.14 52.57 54.00 54.95 56.37 57.80 59.23 1.90 51.79 52.82 54.37 55.40 56.95 58.50 59.53 61.07 62.62 64.16 1.95 55.78 56.89 58.55 59.66 61.33 63.00 64.11 65.77 67.43 69.10 2.00 59.76 60.95 62.74 63.93 65.71 67.49 68.68 70.47 72.25 74.03 2.05 63.75 65.01 66.92 68.19 70.09 71.99 73.26 75.17 77.07 78.97 2.10 67.73 69.08 71.10 72.45 74.47 76.49 77.84 79.86 81.88 83.90 2.15 71.71 73.14 75.28 76.71 78.85 80.99 82.42 84.56 86.70 88.84 2.20 75.70 77.21 79.47 80.97 83.23 85.49 87.00 89.26 91.52 93.77 2.25 79.68 81.27 83.65 85.24 87.61 89.99 91.58 93.96 96.33 98.71 2.30 83.67 85.33 87.83 89.50 92.00 94.49 96.16 98.65 101.2 103.6 2.35 87.65 89.40 92.01 93.76 96.38 98.99 100.7 103.4 106.0 108.6 2.40 91.63 93.46 96.20 98.02 100.8 103.5 105.3 108.1 110.8 113.5 2.45 95.62 97.52 100.4 102.3 105.1 108.0 109.9 112.7 115.6 118.5 2.50 99.60 101.6 104.6 106.5 109.5 112.5 114.5 117.4 120.4 123.4 2.55 103.6 105.6 108.7 110.8 113.9 117.0 119.1 122.1 125.2 128.3 2.60 107.6 109.7 112.9 115.1 118.3 121.5 123.6 126.8 130.1 133.3 2.65 111.6 113.8 117.1 119.3 122.7 126.0 128.2 131.5 134.9 138.2 2.70 115.5 117.8 121.3 123.6 127.0 130.5 132.8 136.2 139.7 143.1 2.75 119.5 121.9 125.5 127.9 131.4 135.0 137.4 140.9 144.5 148.1 2.80 123.5 126.0 129.7 132.1 135.8 139.5 141.9 145.6 149.3 153.0 2.85 127.5 130.0 133.8 136.4 140.2 144.0 146.5 150.3 154.1 157.9 2.90 131.5 134.1 138.0 140.6 144.6 148.5 151.1 155.0 159.0 162.9 2.95 135.5 138.2 142.2 144.9 148.9 153.0 155.7 159.7 163.8 167.8 3.00 139.4 142.2 146.4 149.2 153.3 157.5 160.3 164.4 168.6 172.7 3.05 143.4 146.3 150.6 153.4 157.7 162.0 164.8 169.1 173.4 177.7 3.10 147.4 150.3 154.8 157.7 162.1 166.5 169.4 173.8 178.2 182.6 r2(ohm)=(vout-1.25)*r1/(1.25+50u*r1) n n n n n external rsistor divider table for customized voltage
analog microelectronics, inc. 10 ame1085 3a low dropout positive voltage regulator external rsistor divider table for customized voltage (cont.) r1(ohm) 100 102 105 107 110 113 115 118 121 124 vout 3.15 151.4 154.4 158.9 161.9 166.5 171.0 174.0 178.5 183.0 187.5 3.20 155.4 158.5 163.1 166.2 170.8 175.5 178.6 183.2 187.9 192.5 3.25 159.4 162.5 167.3 170.5 175.2 180.0 183.2 187.9 192.7 197.4 3.30 163.3 166.6 171.5 174.7 179.6 184.5 187.7 192.6 197.5 202.4 3.35 167.3 170.7 175.7 179.0 184.0 189.0 192.3 197.3 202.3 207.3 3.40 171.3 174.7 179.8 183.3 188.4 193.5 196.9 202.0 207.1 212.2 3.45 175.3 178.8 184.0 187.5 192.8 198.0 201.5 206.7 211.9 217.2 3.50 179.3 182.9 188.2 191.8 197.1 202.5 206.1 211.4 216.8 222.1 3.55 183.3 186.9 192.4 196.0 201.5 207.0 210.6 216.1 221.6 227.0 3.60 187.3 191.0 196.6 200.3 205.9 211.5 215.2 220.8 226.4 232.0 3.65 191.2 195.0 200.8 204.6 210.3 216.0 219.8 225.5 231.2 236.9 3.70 195.2 199.1 204.9 208.8 214.7 220.5 224.4 230.2 236.0 241.8 3.75 199.2 203.2 209.1 213.1 219.0 225.0 228.9 234.9 240.8 246.8 3.80 203.2 207.2 213.3 217.3 223.4 229.5 233.5 239.6 245.7 251.7 3.85 207.2 211.3 217.5 221.6 227.8 234.0 238.1 244.3 250.5 256.6 3.90 211.2 215.4 221.7 225.9 232.2 238.5 242.7 249.0 255.3 261.6 3.95 215.1 219.4 225.9 230.1 236.6 243.0 247.3 253.7 260.1 266.5 4.00 219.1 223.5 230.0 234.4 240.9 247.5 251.8 258.4 264.9 271.5 4.05 223.1 227.6 234.2 238.7 245.3 252.0 256.4 263.1 269.7 276.4 4.10 227.1 231.6 238.4 242.9 249.7 256.5 261.0 267.8 274.6 281.3 4.15 231.1 235.7 242.6 247.2 254.1 261.0 265.6 272.5 279.4 286.3 4.20 235.1 239.7 246.8 251.4 258.5 265.5 270.2 277.2 284.2 291.2 4.25 239.0 243.8 250.9 255.7 262.8 270.0 274.7 281.9 289.0 296.1 4.30 243.0 247.9 255.1 260.0 267.2 274.5 279.3 286.6 293.8 301.1 4.35 247.0 251.9 259.3 264.2 271.6 279.0 283.9 291.3 298.6 306.0 4.40 251.0 256.0 263.5 268.5 276.0 283.5 288.5 296.0 303.5 310.9 4.45 255.0 260.1 267.7 272.8 280.4 288.0 293.1 300.7 308.3 315.9 4.50 259.0 264.1 271.9 277.0 284.7 292.5 297.6 305.4 313.1 320.8 4.55 262.9 268.2 276.0 281.3 289.1 297.0 302.2 310.1 317.9 325.7 4.60 266.9 272.2 280.2 285.5 293.5 301.5 306.8 314.8 322.7 330.7 4.65 270.9 276.3 284.4 289.8 297.9 306.0 311.4 319.5 327.5 335.6 4.70 274.9 280.4 288.6 294.1 302.3 310.5 315.9 324.2 332.4 340.6 4.75 278.9 284.4 292.8 298.3 306.7 315.0 320.5 328.8 337.2 345.5 4.80 282.9 288.5 297.0 302.6 311.0 319.5 325.1 333.5 342.0 350.4 4.85 286.9 292.6 301.1 306.8 315.4 324.0 329.7 338.2 346.8 355.4 4.90 290.8 296.6 305.3 311.1 319.8 328.5 334.3 342.9 351.6 360.3 4.95 294.8 300.7 309.5 315.4 324.2 333.0 338.8 347.6 356.4 365.2 5.00 298.8 304.8 313.7 319.6 328.6 337.5 343.4 352.3 361.3 370.2 r2(ohm)=(vout-1.25)*r1/(1.25+50u*r1)
analog microelectronics, inc. 11 ame1085 3a low dropout positive voltage regulator n n n n n package dimension to-252 (dpak) -eiaj to-252 (dpak) jdec min max min max a 0.45 0.58 0.0177 0.023 b 1.60 1.95 0.06 0.0768 c 0.51 - 0.02 - d 0.45 0.60 0.0177 0.0236 e 6.40 6.80 0.252 0.2677 f 5.40 5.80 0.2126 0.2283 g 2.20 2.85 0.0866 0.1122 h - * 2.30 - * 0.0906 i - 0.90 - 0.0354 j - 0.97 - 0.038 k 5.20 5.50 0.20 0.22 l 0.89 2.03 0.035 0.08 * : typical value notes : 1. controlling dimension : millimeters. 2. maximum lead thickness includes lead finish thickness minimum lead thickness is the minimum thickness of base material. symbols millimeters inches min max min max a 0.45 0.58 0.0177 0.023 b 1.60 1.95 0.06 0.0768 c0.51 - 0.02 - d 0.45 0.60 0.0177 0.0236 e 6.40 6.80 0.252 0.2677 f 5.40 5.80 0.2126 0.2283 g 2.20 2.85 0.0866 0.1122 h - * 2.30 - * 0.0906 i - 0.90 - 0.0354 j - 0.97 - 0.038 k 5.20 5.50 0.20 0.22 l 0.89 2.03 0.035 0.08 * : typical value notes : 1. controlling dimension : millimeters. 2. maximum lead thickness includes lead finish thickness minimum lead thickness is the minimum thickness of base material. symbols millimeters inches
analog microelectronics, inc. 12 ame1085 3a low dropout positive voltage regulator n n n n n package dimension to-220 to-263-3 (d 2 pak) min max min max a 4.06 4.83 0.160 0.190 b 0.63 1.02 0.025 0.040 c1 0.35 0.60 0.0138 0.0236 d 14.22 14.99 0.056 0.590 e 9.66 10.54 0.385 0.415 e - 2.79 - 0.110 e1 4.83 5.33 0.190 0.210 e3 1.14 1.40 0.045 0.055 f 1.14 1.40 0.045 0.055 h1 5.94 6.55 0.234 0.258 k 2.29 2.92 0.090 0.115 cp 3.71 3.96 0.146 0.156 q 2.62 2.87 0.103 0.113 l 12.70 14.27 0.500 0.5618 a 3d7d3d7d b1 1.14 1.52 0.0449 0.06 r notes : 1. dime ns ion c1 apply for tin plate finis h. 2. for s olde r dip le ad finis h dime ns ion c1 s hould be 0.015"-0.027" (0.38-0.69) 6.17 ref. 0.243 ref. symbols millimeters inches min max min max a 9.65 10.41 0.380 0.410 b 8.28 9.65 0.326 0.380 c 4.06 4.83 0.160 0.190 d 0.51 1.02 0.020 0.040 e 1.14 1.40 0.045 0.055 g h 14.61 15.88 0.575 0.625 k 1.02 1.68 0.040 0.066 l 0.00 0.97 0.000 0.038 m 2.49 2.74 0.098 0.108 n 0.43 0.58 0.017 0.023 p 2.29 2.79 0.090 0.110 r 0 o 8 ? 0 o 8 ? s 2.41 2.67 0.095 0.105 w 0.254 0.508 0.010 0.020 * : typical value notes : 1. controlling dimension : millimeters. 2maximum lead thickness includes lead finish thickness minimum lead thickness is the minimum thickness of base materia. * 2.54 * 0.100 symbols millimeters inches
analog microelectronics, inc. 13 ame1085 3a low dropout positive voltage regulator n n n n n package dimension to-263-2 (d 2 pak) min max min max a 9.65 10.41 0.380 0.410 b 8.28 9.65 0.326 0.380 c 4.06 4.83 0.160 0.190 d 0.51 1.02 0.020 0.040 e 1.14 1.40 0.045 0.055 g h 14.61 15.88 0.575 0.625 k 1.02 1.68 0.040 0.066 l 0.00 0.97 0.000 0.038 m 2.49 2.74 0.098 0.108 n 0.43 0.58 0.017 0.023 p 2.29 2.79 0.090 0.110 r 0 o 8 ? 0 o 8 ? s 2.41 2.67 0.095 0.105 w 0.254 0.508 0.010 0.020 * : typical value notes : 1. controlling dimension : millimeters. 2maximum lead thickness includes lead finish thickness minimum lead thickness is the minimum thickness of base materia. * 2.54 * 0.100 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. , july 2001 document: 1013-duc-b-0704 corporate headquarters asia pacific headquarters analog microelectronics, inc. ame, inc. 3100 de la cruz blvd. suite 201 2f, 187 kang-chien road, nei-hu dist., 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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