Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n General Description n Key Features l 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. 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 n Typical Application Input AME1085 V IN VOUT GND Current Limiting Amplifier 4.75V to 5.25V Thermal Protection Error Amp. 10F Tan 10F Tan L o a d Output Bandgap Reference ADJ/GND Figure 2 Figure 1 1 Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Pin Configuration To-263 Front View To-263-2 Front View AME 1085 AME 1085 1 1 2 ADJ/GND VOUT 3 V IN To-252-2 Front View 2 ADJ/GND VOUT 3 V IN TO-252-2 Front view AME1085 AME 1085 1 2 3 1 2 3 VOUT ADJ/GND VOUT 2 V IN ADJ/ GND V IN Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Ordering Information Part Number Marking Output Voltage Package AME1085ACBT AME1085 ACBT YYWW ADJ TO-220 AME1085DCBT AME1085 DCBT YYWW 3.3 TO-220 ADJ TO-263-3 3.3 TO-263-3 ADJ TO-263-2 3.3 TO-263-2 ADJ TO-252-2 3.3 TO-252-2 AME1085ACDT-3 AME1085DCDT-3 AME1085ACDT AME1085DCDT AME1085AMCT AME1085MCT* AME1085 ACDT-3 YYWW AME1085 DCDT-3 YYWW AME1085 ACDT YYWW AME1085 DCDT YYWW AME1085 AMCT YYWW AME1085 MCT YYWW * This differs from our standard part numbering scheme due to historical precedent n Absolute Maximum Ratings Symbol Maximum Parameter VIN Input Voltage Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) TO-220 TO-263 TO-252 JC TO-220 TO-263 JA 2.5 2.5 15 50 V 0 C/W 60 90 TO-252 Operating Junction Temperature Range Units 7 TJ 0 to 125 Storage Temperature Range TSTG -65 to 150 Lead Temperature ( 10 sec ) TLEAD 260 0 C 3 Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Electrical Characteristics AME1085AXXX Parameter Reference voltage (adjustable voltage) VREF Line regulation RegLINE Load regulation RegLOAD Dropout voltage VOUT, VREF = 1% Current limit Test Conditions Symbol VD 0 Min. 1.238 Typ. Max. 1.262 VIN = 5V TJ =25 C IO = 10mA Over temp. 1.225 VIN = 2.75 - 7V TJ =250C - 0.015 0.2 IO = 10mA Over temp. - 0.035 0.2 VIN = 5V TJ =250C - 0.05 0.3 IO = 10mA - 3A Over temp. - 0.2 0.4 VIN = 2.75 - 7V TJ =250C - 1.2 1.4 IO = 10mA - 3A Over temp. - 1.3 - 3.0 - - 1.250 1.275 Units V % % V IS VIN = 2.75 - 7V, Over temp. Temperature Coefficient TC VIN = 2.75 - 7V, IO = 10mA - 3A - 0.005 - A %/OC Temperature stability TS VIN = 5V, IO = 500mA, Over temp. - 0.5 - % Minimum load current IO VIN = 5V - 5 10 mA - 0.003 - %V0 60 72 - dB Min. 3.267 Typ. Max. 3.333 Units 0 RMS output noise VN TJ =25 C Ripple rejection ratio RA VIN = 5V, IO = 3A, Over temp. AME1085DXXX Parameter Output voltage (fixed voltage) RegLINE Load regulation RegLOAD VOUT, VREF = 1% Current limit Quiescent current (fixed model) Temperature Coefficient Temperature stability 4 Vo Line regulation Dropout voltage Test Conditions Symbol VD 0 VIN = 5V TJ =25 C IO = 0A Over temp. 3.234 VIN =4.5 - 7V TJ =250C - 0.015 0.2 IO = 0A Over temp. - 0.035 0.2 VIN = 5V TJ =250C - 0.05 0.3 IO = 0A - 3A Over temp. - 0.2 0.4 VIN = 4.5 - 7V TJ =250C - 1.2 1.4 IO = 0A - 3A Over temp. - 1.3 - 3.0 - - A 3.300 3.366 V % % V IS VIN = 4.5 - 7V, Over temp. IQ VIN = 5V, Io=0A - 3A, Over temp. - 12 13 mA TC VIN = 4.5 - 7V, IO = 0A - 3A - 0.005 - %/0C TS VIN = 5V, IO = 500mA, Over temp. - 0.5 - % - 0.003 - %V0 60 72 - dB 0 RMS output noise VN TJ =25 C Ripple rejection ratio RA VIN = 5V, IO = 3A, Over temp. Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Application Description 3. Current limit protection AME1085 is protected against overload conditions. Current protection is triggered at typically 4.5A. 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 IN ADJ 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 OUT C1 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. V REF R1 I A DJ 50A R2 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. V O U T = V R E F (1+ R 2 ) + I ADJ x R2 R1 Figure 3 RP Parasitic Line Resistance V IN IN OUT ADJ 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. R1 (Connect R1 to case) RL R2 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) Connect R2 to load Note: TJUNCTION must not exceed 125OC Figure 4 5 Analog Microelectronics, Inc. AME1085 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 3A Low Dropout Positive Voltage Regulator Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Advanced Applications AME1085 V IN = 5V * V O = 1.5 - 3.45V V OUT V IN ADJ R1 10F 10F 10F 1K ** 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. 3A Low Dropout Positive Voltage Regulator AME1085 n Advanced Applications (Cont.) V IN V IN AME1085 V OUT GND 10F 10F 1K 10F ** * VO = VREF + VZ (VZ: breakdown voltage of Zener diode) ** Optional for improved ripple rejection Figure 7 Regulator with reference * V IN AME1085 V OUT VO GND 10F 100F Figure 8 Regulator with reverse diode protection 8 Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 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 3.10 100 102 105 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 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 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 98.02 100.8 103.5 105.3 102.3 105.1 108.0 109.9 106.5 109.5 112.5 114.5 110.8 113.9 117.0 119.1 115.1 118.3 121.5 123.6 119.3 122.7 126.0 128.2 123.6 127.0 130.5 132.8 127.9 131.4 135.0 137.4 132.1 135.8 139.5 141.9 136.4 140.2 144.0 146.5 140.6 144.6 148.5 151.1 144.9 148.9 153.0 155.7 149.2 153.3 157.5 160.3 153.4 157.7 162.0 164.8 157.7 162.1 166.5 169.4 118 121 124 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 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 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. 3A Low Dropout Positive Voltage Regulator AME1085 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 10 100 102 105 151.4 155.4 159.4 163.3 167.3 171.3 175.3 179.3 183.3 187.3 191.2 195.2 199.2 203.2 207.2 211.2 215.1 219.1 223.1 227.1 231.1 235.1 239.0 243.0 247.0 251.0 255.0 259.0 262.9 266.9 270.9 274.9 278.9 282.9 286.9 290.8 294.8 298.8 154.4 158.5 162.5 166.6 170.7 174.7 178.8 182.9 186.9 191.0 195.0 199.1 203.2 207.2 211.3 215.4 219.4 223.5 227.6 231.6 235.7 239.7 243.8 247.9 251.9 256.0 260.1 264.1 268.2 272.2 276.3 280.4 284.4 288.5 292.6 296.6 300.7 304.8 158.9 163.1 167.3 171.5 175.7 179.8 184.0 188.2 192.4 196.6 200.8 204.9 209.1 213.3 217.5 221.7 225.9 230.0 234.2 238.4 242.6 246.8 250.9 255.1 259.3 263.5 267.7 271.9 276.0 280.2 284.4 288.6 292.8 297.0 301.1 305.3 309.5 313.7 107 110 113 115 R2(ohm)=(Vout-1.25)*R1/(1.25+50u*R1) 161.9 166.5 171.0 174.0 166.2 170.8 175.5 178.6 170.5 175.2 180.0 183.2 174.7 179.6 184.5 187.7 179.0 184.0 189.0 192.3 183.3 188.4 193.5 196.9 187.5 192.8 198.0 201.5 191.8 197.1 202.5 206.1 196.0 201.5 207.0 210.6 200.3 205.9 211.5 215.2 204.6 210.3 216.0 219.8 208.8 214.7 220.5 224.4 213.1 219.0 225.0 228.9 217.3 223.4 229.5 233.5 221.6 227.8 234.0 238.1 225.9 232.2 238.5 242.7 230.1 236.6 243.0 247.3 234.4 240.9 247.5 251.8 238.7 245.3 252.0 256.4 242.9 249.7 256.5 261.0 247.2 254.1 261.0 265.6 251.4 258.5 265.5 270.2 255.7 262.8 270.0 274.7 260.0 267.2 274.5 279.3 264.2 271.6 279.0 283.9 268.5 276.0 283.5 288.5 272.8 280.4 288.0 293.1 277.0 284.7 292.5 297.6 281.3 289.1 297.0 302.2 285.5 293.5 301.5 306.8 289.8 297.9 306.0 311.4 294.1 302.3 310.5 315.9 298.3 306.7 315.0 320.5 302.6 311.0 319.5 325.1 306.8 315.4 324.0 329.7 311.1 319.8 328.5 334.3 315.4 324.2 333.0 338.8 319.6 328.6 337.5 343.4 118 121 124 178.5 183.2 187.9 192.6 197.3 202.0 206.7 211.4 216.1 220.8 225.5 230.2 234.9 239.6 244.3 249.0 253.7 258.4 263.1 267.8 272.5 277.2 281.9 286.6 291.3 296.0 300.7 305.4 310.1 314.8 319.5 324.2 328.8 333.5 338.2 342.9 347.6 352.3 183.0 187.9 192.7 197.5 202.3 207.1 211.9 216.8 221.6 226.4 231.2 236.0 240.8 245.7 250.5 255.3 260.1 264.9 269.7 274.6 279.4 284.2 289.0 293.8 298.6 303.5 308.3 313.1 317.9 322.7 327.5 332.4 337.2 342.0 346.8 351.6 356.4 361.3 187.5 192.5 197.4 202.4 207.3 212.2 217.2 222.1 227.0 232.0 236.9 241.8 246.8 251.7 256.6 261.6 266.5 271.5 276.4 281.3 286.3 291.2 296.1 301.1 306.0 310.9 315.9 320.8 325.7 330.7 335.6 340.6 345.5 350.4 355.4 360.3 365.2 370.2 Analog Microelectronics, Inc. 3A Low Dropout Positive Voltage Regulator AME1085 n Package Dimension TO-252 (DPAK) -EIAJ SYMBOLS A B C D E F G H I J K L 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 * : 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. TO-252 (DPAK) JDEC SYMBOLS A B C D E F G H I J K L 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 * : 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. 3A Low Dropout Positive Voltage Regulator AME1085 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. 3A Low Dropout Positive Voltage Regulator AME1085 n Package Dimension TO-263-2 (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. 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. 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 Santa Clara, CA. 95054-2046 2F, 187 Kang-Chien Road, Nei-Hu Dist., Taipei 114, Taiwan, R.O.C. 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