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| Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n General Description The AME1085 is a 3A low-dropout positive voltage regulator. It is available in fixed and adjustable output voltage versions. Overcurrent and thermal protection are integrated 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 Key Features l l l l l l l l Low dropout voltage 1.2V typically at 3A Adjustable or 3.3V fixed voltage Line regulation typically 0.015% Load regulation typically 0.05% Adjust pin (ADJ) current less than 90A Overcurrent protection Thermal protection Available in TO-220, TO-263, TO-252 n Applications l l l l High Efficiency Linear Regulators Post Regulators for Switching Supplies 5V to 3.3V Voltage Converter Battery Charger n Functional Block Diagram Input n Typical Application AME1085 V IN GND VOUT Current Limiting Amplifier Thermal Protection Output 4.75V to 5.25V 10F Tan 10F Tan L o a d Error Amp. Bandgap Reference ADJ/GND Figure 2 Figure 1 1 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Pin Configuration To-263 Front View To-263-2 Front View AME 1085 1 2 3 AME 1085 1 2 3 ADJ/GND VOUT V IN ADJ/GND VOUT V IN To-252-2 Front View TO-252-2 Front view AME1085 AME 1085 1 2 3 1 ADJ/ GND 2 VOUT 3 ADJ/GND VOUT V IN V IN 2 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Ordering Information Part Number AME1085ACBT Marking AME1085 ACBT YYWW AME1085 DCBT YYWW AME1085 ACDT-3 YYWW AME1085 DCDT-3 YYWW AME1085 ACDT YYWW AME1085 DCDT YYWW AME1085 AMCT YYWW AME1085 MCT YYWW Output Voltage ADJ Package TO-220 AME1085DCBT 3.3 TO-220 AME1085ACDT-3 ADJ TO-263-3 AME1085DCDT-3 3.3 TO-263-3 AME1085ACDT ADJ TO-263-2 AME1085DCDT 3.3 TO-263-2 AME1085AMCT ADJ TO-252-2 AME1085MCT* 3.3 TO-252-2 * This differs from our standard part numbering scheme due to historical precedent n Absolute Maximum Ratings Parameter Input Voltage Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Operating Junction Temperature Range Storage Temperature Range Lead Temperature ( 10 sec ) TO-220 TO-263 TO-252 TO-220 TO-263 TO-252 TJ TSTG TLEAD JA Symbol Maximum VIN JC 7 2.5 2.5 15 50 60 90 0 to 125 -65 to 150 260 Units V 0 C/W 0 C 3 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Electrical Characteristics AME1085AXXX Parameter Reference voltage (adjustable voltage) Line regulation Load regulation Dropout voltage VOUT, VREF = 1% Current limit Temperature Coefficient Temperature stability Minimum load current RMS output noise Ripple rejection ratio Symbol VREF RegLINE RegLOAD VD IS TC TS IO VN RA VIN = 5V IO = 10mA VIN = 2.75 - 7V IO = 10mA VIN = 5V IO = 10mA - 3A VIN = 2.75 - 7V IO = 10mA - 3A VIN = 2.75 - 7V, Over temp. VIN = 2.75 - 7V, IO = 10mA - 3A VIN = 5V, IO = 500mA, Over temp. VIN = 5V TJ =25 C VIN = 5V, IO = 3A, Over temp. 0 Test Conditions TJ =25 C TJ =250C Over temp. TJ =250C Over temp. TJ =250C Over temp. 0 Min. 1.238 3.0 60 Typ. 1.250 0.015 0.035 0.05 0.2 1.2 1.3 0.005 0.5 5 0.003 72 Max. 1.262 1.275 0.2 0.2 0.3 0.4 1.4 10 - Units V % % V A %/OC % mA %V0 dB Over temp. 1.225 AME1085DXXX Parameter Output voltage (fixed voltage) Line regulation Load regulation Dropout voltage VOUT, VREF = 1% Current limit Quiescent current (fixed model) Temperature Coefficient Temperature stability RMS output noise Ripple rejection ratio Symbol Vo RegLINE RegLOAD VD IS IQ TC TS VN RA VIN = 5V IO = 0A VIN =4.5 - 7V IO = 0A VIN = 5V IO = 0A - 3A VIN = 4.5 - 7V IO = 0A - 3A VIN = 4.5 - 7V, Over temp. VIN = 5V, Io=0A - 3A, Over temp. VIN = 4.5 - 7V, IO = 0A - 3A VIN = 5V, IO = 500mA, Over temp. TJ =25 C VIN = 5V, IO = 3A, Over temp. 0 Test Conditions TJ =25 C TJ =250C Over temp. TJ =250C Over temp. TJ =250C Over temp. 0 Min. 3.267 3.0 60 Typ. 3.300 0.015 0.035 0.05 0.2 1.2 1.3 12 0.005 0.5 0.003 72 Max. 3.333 3.366 0.2 0.2 0.3 0.4 1.4 13 - Units V % % V A mA %/0C % %V0 dB Over temp. 3.234 4 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator 3. Current limit protection AME1085 is protected against overload conditions. Current protection is triggered at typically 4.5A. 4. Stability and load regulation AME1085 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10F tantalum or 50F aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5. The output capacitor dose not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator design. V OUT V REF R1 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 VREF is available externally as 1.25V between VOUT 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: R2 ) + IADJ x R2 VOUT = VREF ( 1 + R1 On fixed versions of AME1085, the voltage divider is provided internally. V IN C1 IN ADJ I A DJ 50A OUT R2 V O U T = V R E F (1+ R 2 ) + I ADJ x R2 R1 V IN For the adjustable version, the best load regulation is accomplished when the top of the resistor divider (R1) is connected directly to the output pin of the AME1085. When so connected, RP is not multiplied by the divider ratio. For fixed output versions, the top of R1 is internally connected to the output and ground pin can be connected to low side of the load. RP Parasitic Line Resistance IN ADJ OUT Figure 3 2. Thermal protection AME1085 has thermal protection which limits junction temperature to 150OC. However, device functionality is only guaranteed to a maximum junction temperature of +125OC. The power dissipation and junction temperature for AME1085 in TO-220 package are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + ( PD x JA) Note: TJUNCTION must not exceed 125OC R1 (Connect R1 to case) RL R2 Connect R2 to load Figure 4 5 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator 5. Thermal consideration The AME1085 series contain thermal limiting circuitry designed to protect itself for over-temperature 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 thermal resistance between junction and ambient. It includes junction-to-case, case-to-heat-sink interface 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 required 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 electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. 6 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Advanced Applications V IN = 5V AME1085 V IN V OUT ADJ R1 * V O = 1.5 - 3.45V 10F 10F 1K 10F ** R2 2K R2 ) + IADJ x R2 R1 ** Optional for improved ripple rejection * VO = VREF ( 1 + Figure 5 Adjustable output voltage V IN V IN AME1085 V OUT GND R1 * 20m VO I O = 0 to 6A 10 F 10F V IN AME1085 V OUT GND R2 * 20m * 20m is ballast resistance The inter - connection of #18 wire could act as ballast resistance Figure 6 Paralleling Regulators 7 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Advanced Applications (Cont.) V IN V IN 10F AME1085 V OUT GND 10F 1K 10F ** * VO = VREF + VZ (VZ: breakdown voltage of Zener diode) ** Optional for improved ripple rejection Figure 7 Regulator with reference * V IN 10F AME1085 V OUT GND VO 100F Figure 8 Regulator with reverse diode protection 8 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n External Rsistor Divider Table for Customized Voltage R1(ohm) Vout 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 100 0.000 3.984 7.968 11.95 15.94 19.92 23.90 27.89 31.87 35.86 39.84 43.82 47.81 51.79 55.78 59.76 63.75 67.73 71.71 75.70 79.68 83.67 87.65 91.63 95.62 99.60 103.6 107.6 111.6 115.5 119.5 123.5 127.5 131.5 135.5 139.4 143.4 147.4 102 0.000 4.063 8.127 12.19 16.25 20.32 24.38 28.44 32.51 36.57 40.63 44.70 48.76 52.82 56.89 60.95 65.01 69.08 73.14 77.21 81.27 85.33 89.40 93.46 97.52 101.6 105.6 109.7 113.8 117.8 121.9 126.0 130.0 134.1 138.2 142.2 146.3 150.3 105 0.000 4.182 8.365 12.55 16.73 20.91 25.09 29.28 33.46 37.64 41.82 46.01 50.19 54.37 58.55 62.74 66.92 71.10 75.28 79.47 83.65 87.83 92.01 96.20 100.4 104.6 108.7 112.9 117.1 121.3 125.5 129.7 133.8 138.0 142.2 146.4 150.6 154.8 107 110 113 115 R2(ohm)=(Vout-1.25)*R1/(1.25+50u*R1) 0.000 0.000 0.000 0.000 4.262 4.381 4.500 4.579 8.524 8.761 8.999 9.158 12.79 13.14 13.50 13.74 17.05 17.52 18.00 18.32 21.31 21.90 22.50 22.89 25.57 26.28 27.00 27.47 29.83 30.67 31.50 32.05 34.09 35.05 36.00 36.63 38.36 39.43 40.50 41.21 42.62 43.81 45.00 45.79 46.88 48.19 49.50 50.37 51.14 52.57 54.00 54.95 55.40 56.95 58.50 59.53 59.66 61.33 63.00 64.11 63.93 65.71 67.49 68.68 68.19 70.09 71.99 73.26 72.45 74.47 76.49 77.84 76.71 78.85 80.99 82.42 80.97 83.23 85.49 87.00 85.24 87.61 89.99 91.58 89.50 92.00 94.49 96.16 93.76 96.38 98.99 100.7 98.02 100.8 103.5 105.3 102.3 105.1 108.0 109.9 106.5 109.5 112.5 114.5 110.8 113.9 117.0 119.1 115.1 118.3 121.5 123.6 119.3 122.7 126.0 128.2 123.6 127.0 130.5 132.8 127.9 131.4 135.0 137.4 132.1 135.8 139.5 141.9 136.4 140.2 144.0 146.5 140.6 144.6 148.5 151.1 144.9 148.9 153.0 155.7 149.2 153.3 157.5 160.3 153.4 157.7 162.0 164.8 157.7 162.1 166.5 169.4 118 0.000 4.698 9.396 14.09 18.79 23.49 28.19 32.88 37.58 42.28 46.98 51.68 56.37 61.07 65.77 70.47 75.17 79.86 84.56 89.26 93.96 98.65 103.4 108.1 112.7 117.4 122.1 126.8 131.5 136.2 140.9 145.6 150.3 155.0 159.7 164.4 169.1 173.8 121 0.000 4.817 9.633 14.45 19.27 24.08 28.90 33.72 38.53 43.35 48.17 52.98 57.80 62.62 67.43 72.25 77.07 81.88 86.70 91.52 96.33 101.2 106.0 110.8 115.6 120.4 125.2 130.1 134.9 139.7 144.5 149.3 154.1 159.0 163.8 168.6 173.4 178.2 124 0.000 4.936 9.871 14.81 19.74 24.68 29.61 34.55 39.48 44.42 49.36 54.29 59.23 64.16 69.10 74.03 78.97 83.90 88.84 93.77 98.71 103.6 108.6 113.5 118.5 123.4 128.3 133.3 138.2 143.1 148.1 153.0 157.9 162.9 167.8 172.7 177.7 182.6 9 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator External Rsistor Divider Table for Customized Voltage (Cont.) R1(ohm) Vout 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 100 151.4 155.4 159.4 163.3 167.3 171.3 175.3 179.3 183.3 187.3 191.2 195.2 199.2 203.2 207.2 211.2 215.1 219.1 223.1 227.1 231.1 235.1 239.0 243.0 247.0 251.0 255.0 259.0 262.9 266.9 270.9 274.9 278.9 282.9 286.9 290.8 294.8 298.8 102 154.4 158.5 162.5 166.6 170.7 174.7 178.8 182.9 186.9 191.0 195.0 199.1 203.2 207.2 211.3 215.4 219.4 223.5 227.6 231.6 235.7 239.7 243.8 247.9 251.9 256.0 260.1 264.1 268.2 272.2 276.3 280.4 284.4 288.5 292.6 296.6 300.7 304.8 105 158.9 163.1 167.3 171.5 175.7 179.8 184.0 188.2 192.4 196.6 200.8 204.9 209.1 213.3 217.5 221.7 225.9 230.0 234.2 238.4 242.6 246.8 250.9 255.1 259.3 263.5 267.7 271.9 276.0 280.2 284.4 288.6 292.8 297.0 301.1 305.3 309.5 313.7 107 110 113 115 R2(ohm)=(Vout-1.25)*R1/(1.25+50u*R1) 161.9 166.5 171.0 174.0 166.2 170.8 175.5 178.6 170.5 175.2 180.0 183.2 174.7 179.6 184.5 187.7 179.0 184.0 189.0 192.3 183.3 188.4 193.5 196.9 187.5 192.8 198.0 201.5 191.8 197.1 202.5 206.1 196.0 201.5 207.0 210.6 200.3 205.9 211.5 215.2 204.6 210.3 216.0 219.8 208.8 214.7 220.5 224.4 213.1 219.0 225.0 228.9 217.3 223.4 229.5 233.5 221.6 227.8 234.0 238.1 225.9 232.2 238.5 242.7 230.1 236.6 243.0 247.3 234.4 240.9 247.5 251.8 238.7 245.3 252.0 256.4 242.9 249.7 256.5 261.0 247.2 254.1 261.0 265.6 251.4 258.5 265.5 270.2 255.7 262.8 270.0 274.7 260.0 267.2 274.5 279.3 264.2 271.6 279.0 283.9 268.5 276.0 283.5 288.5 272.8 280.4 288.0 293.1 277.0 284.7 292.5 297.6 281.3 289.1 297.0 302.2 285.5 293.5 301.5 306.8 289.8 297.9 306.0 311.4 294.1 302.3 310.5 315.9 298.3 306.7 315.0 320.5 302.6 311.0 319.5 325.1 306.8 315.4 324.0 329.7 311.1 319.8 328.5 334.3 315.4 324.2 333.0 338.8 319.6 328.6 337.5 343.4 118 178.5 183.2 187.9 192.6 197.3 202.0 206.7 211.4 216.1 220.8 225.5 230.2 234.9 239.6 244.3 249.0 253.7 258.4 263.1 267.8 272.5 277.2 281.9 286.6 291.3 296.0 300.7 305.4 310.1 314.8 319.5 324.2 328.8 333.5 338.2 342.9 347.6 352.3 121 183.0 187.9 192.7 197.5 202.3 207.1 211.9 216.8 221.6 226.4 231.2 236.0 240.8 245.7 250.5 255.3 260.1 264.9 269.7 274.6 279.4 284.2 289.0 293.8 298.6 303.5 308.3 313.1 317.9 322.7 327.5 332.4 337.2 342.0 346.8 351.6 356.4 361.3 124 187.5 192.5 197.4 202.4 207.3 212.2 217.2 222.1 227.0 232.0 236.9 241.8 246.8 251.7 256.6 261.6 266.5 271.5 276.4 281.3 286.3 291.2 296.1 301.1 306.0 310.9 315.9 320.8 325.7 330.7 335.6 340.6 345.5 350.4 355.4 360.3 365.2 370.2 10 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Package Dimension TO-252 (DPAK) -EIAJ SYMBOLS A B C D E F G H I J K L * : 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. MILLIMETERS MIN MAX 0.45 0.58 1.60 1.95 0.51 0.45 0.60 6.40 6.80 5.40 5.80 2.20 2.85 * 2.30 0.90 0.97 5.20 5.50 0.89 2.03 INCHES MIN MAX 0.0177 0.023 0.06 0.0768 0.02 0.0177 0.0236 0.252 0.2677 0.2126 0.2283 0.0866 0.1122 * 0.0906 0.0354 0.038 0.20 0.22 0.035 0.08 TO-252 (DPAK) JDEC MILLIMETERS MIN MAX 0.45 0.58 1.60 1.95 0.51 0.45 0.60 6.40 6.80 5.40 5.80 2.20 2.85 * 2.30 0.90 0.97 5.20 5.50 0.89 2.03 INCHES MIN MAX 0.0177 0.023 0.06 0.0768 0.02 0.0177 0.0236 0.252 0.2677 0.2126 0.2283 0.0866 0.1122 * 0.0906 0.0354 0.038 0.20 0.22 0.035 0.08 SYMBOLS A B C D E F G H I J K L * : 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. 11 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Package Dimension TO-220 SYMBOLS A b C1 D E e e1 e3 f H1 K CP Q L a b1 R MILLIMETERS MIN MAX 4.06 4.83 0.63 1.02 0.35 0.60 14.22 14.99 9.66 10.54 2.79 4.83 5.33 1.14 1.40 1.14 1.40 5.94 6.55 2.29 2.92 3.71 3.96 2.62 2.87 12.70 14.27 3D 7D 1.14 1.52 6.17 REF. INCHES MIN MAX 0.160 0.190 0.025 0.040 0.0138 0.0236 0.056 0.590 0.385 0.415 0.110 0.190 0.210 0.045 0.055 0.045 0.055 0.234 0.258 0.090 0.115 0.146 0.156 0.103 0.113 0.500 0.5618 3D 7D 0.0449 0.06 0.243 REF. Notes : 1. Dimension C1 apply for tin plate finish. 2. For solder dip lead finish dimension C1 should be 0.015"-0.027" (0.38-0.69) TO-263-3 (D2PAK) SYMBOLS A B C D E G H K L M N P R S W * MILLIMETERS MIN MAX 9.65 10.41 8.28 9.65 4.06 4.83 0.51 1.02 1.14 1.40 * 2.54 14.61 15.88 1.02 1.68 0.00 0.97 2.49 2.74 0.43 0.58 2.29 2.79 o 8? 0 2.41 2.67 0.254 0.508 INCHES MIN MAX 0.380 0.410 0.326 0.380 0.160 0.190 0.020 0.040 0.045 0.055 * 0.100 0.575 0.625 0.040 0.066 0.000 0.038 0.098 0.108 0.017 0.023 0.090 0.110 o 0 8? 0.095 0.105 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. 12 Analog Microelectronics, Inc. AME1085 3A Low Dropout Positive Voltage Regulator n Package Dimension TO-263-2 (D2PAK) MILLIMETERS MIN MAX 9.65 10.41 8.28 9.65 4.06 4.83 0.51 1.02 1.14 1.40 * 2.54 14.61 15.88 1.02 1.68 0.00 0.97 2.49 2.74 0.43 0.58 2.29 2.79 o 8? 0 2.41 2.67 0.254 0.508 INCHES MIN MAX 0.380 0.410 0.326 0.380 0.160 0.190 0.020 0.040 0.045 0.055 * 0.100 0.575 0.625 0.040 0.066 0.000 0.038 0.098 0.108 0.017 0.023 0.090 0.110 o 0 8? 0.095 0.105 0.010 0.020 SYMBOLS A B C D E G H K L M N P R S W * : Typical value NOTES : 1. CONTROLLING DIMENSION : MILLIMETERS. 2MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIA. 13 www.analogmicro.com E-Mail: info@analogmicro.com Life Support Policy: These products of Analog Microelectronics, Inc. are not authorized for use as critical components in lifesupport 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. (c) Analog Microelectronics, Inc. , July 2001 Document: 1013-duc-B-0704 Corporate Headquarters Analog Microelectronics, Inc. 3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489 Asia Pacific Headquarters AME, Inc. 2F, 187 Kang-Chien Road, Nei-Hu Dist., Taipei 114, Taiwan, R.O.C. Tel : 886 2 2627-8687 Fax : 886 2 2659-2989 |
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