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| AIC1084 5A Low Dropout Positive Adjustable Regulator n FEATURES l l l l l n DESCRIPTION The AIC1084 is a low dropout three terminal regulator with 5A output current capability. The output voltage is adjustable with the use of a resistor divider or fixed 3.3V. Dropout voltage is guaranteed to be at maximum of 1.4V with the maximum output current. Its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Current limit and thermal protection provide protection against any overload condition that would create excessive junction temperatures. Dropout Voltage 1.3V at 5A Output Current. Fast Transient Response. Extremely Tight Line and Load Regulation. Current Limiting and Thermal Protection. Adjustable Output Voltage or Fixed 1.5V, 1.8V, 3.3V. Standard 3-Pin Power Packages. l n APPLICATIONS l l l l Mother Board I/O Power Supplies. Microprocessor Power Supplies. High Current Regulator. Post Regulator for Switching Supply. n TYPICAL APPLICATION CIRCUIT VIN 5V 3 AIC1084 1 ADJ C1 + 10F 2 VREF VOUT 3.3V RF1 125 1% + C2 RF2 10F 205 1% VR E F=VOUT - VADJ =1.25V (typ.) VOUT =VREF x (1+RF2/RF1)+ IADJ x RF2 IADJ =55A (typ.) (1) C1 needed if device is far away from filter capacitors. (2) C2 required for stability. Adjustable Voltage Regulator VIN 5V 3 AIC1084-33 1 2 VOUT 3.3V C1 + 10F GND + C2 10F Fixed Voltage Regulator Analog Integrations Corporation DS-1084-03 Sep 21, 01 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1084 n ORDERING INFORMATION AIC1084-XXCX PACKAGING TYPE E: TO-252 M: TO-263 T: TO-220 MA: TO-263AA ORDER NUMBER AIC1084CE (TO-252) PIN CONFIGURATION FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 OUTPUT VOLTAGE DEFAULT: ADJ. 15: 1.5V 18: 1.8V 33: 3.3V AIC1084CM (TO-263) FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 AIC1084CMA (TO-263AA) FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 AIC1084CT (TO-220) FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 n ABSOLUTE MAXIMUM RATINGS VIN pin to ADJ/GND pin ......................... ... .................. ... ... .......................... ........... 7V .................................. ... ... .... ... ................. - 65C ~ 150C TO-252 TO-252 TO-263AA TO-220 Lead Temperature (Soldering) 10 sec. ... ... ... ... ... ... ... ... ... ... ... ... ... 15C/W 6C /W ... ... ... ... ... ... ... ... ... ... ..... 100C/W ... ........ ... ........ ... ... ... ... ... 60C /W ... ..... ... ..... ... ........ ... ... 60C /W ... ....... ... ....... ... ... ... ... ... .. 50C /W TO-263, TO263AA, TO-220........ ... ... .... Thermal Resistance Junction to Ambient (Assume no ambient airflow, no heatsink) TO-263 Operating Junction Temperature Range ..................... ... ... ... ... ...................... 0C~ 125C Storage Temperature Range Thermal Resistance Junction to Case ........................ ... ... ..... ............... ... ..... .......260C 2 AIC1084 n TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT. n ELECTRICAL CHARACTERISTICS specified) (V IN =5V, TJ=25C, IO=10mA, Unless otherwise PARAMETER Reference Voltage TEST CONDITIONS AIC1084 (ADJ) TJ =25C AIC1084-15 VIN =5V AIC1084-18 VIN =5V AIC1084-33 VIN =5V ADJ : 2.65V VIN 7V VOUT=1.25V Fix : VOUT+1.4V VIN 7V TJ =25C 10mA < IO < 5A TJ =25C VOUT, VREF =1% 10mA IO 5A 0C TJ 125C 0C TJ 125C 2.65V VIN 7V 2.65V VIN 7V 0C TJ 125C IO=0.5A 0C TJ 125C 0C TJ 125C 10Hz f 10KHz 120Hz input ripple COUT=25F (V IN -V OUT)=3V MIN. 1.238 1.48 1.78 3.26 TYP. 1.25 1.50 1.80 3.30 MAX. 1.262 1.52 1.82 3.34 UNIT V Output Voltage V Line Regulation 0.015 0.2 % Load Regulation 0.6 % Dropout Voltage Current Limit Adjusted Pin Current Adjusted Pin Current Change (IADJ) Temperature Stability Minimum Load Current RMS Output Noise (% of VOUT) Ripple Rejection Ratio 1.3 5 6 55 0.2 0.5 5 0.003 60 72 1.4 V A 120 5 A A % 10 mA % dB 3 AIC1084 n BLOCK DIAGRAM VIN + GM V REF + 1.25V Current Amp. - Thermal Limit 55A Current Limit VOUT For fixed voltage device ADJ GND n PIN DESCRIPTIONS ADJ PIN Providing VREF=1.25V (typ.) for adjustable VOUT. VREF=VOUT-V ADJ and IADJ=55A (typ.) GND PIN- Power ground. VOUT PIN VIN PIN Adjustable output voltage. Power Input. n TYPICAL Output Voltage (V, AC) 0.4 0.2 0 -0.2 -0.4 PERFORMANCE CHARACTERISTICS Output Voltage (mV, AC) 50 0 -50 Input Voltage (V) Load Current VIN=5.0V CIN=1F(Tantalum) COUT=10F(Tantalum) VOUT=3.3V -100 CIN=1F (Tantalum) COUT =10F (Tantalum) VOUT=3.3V 7.0 6.0 2.5A 0.1A 0 20 40 60 80 100 0 40 80 120 160 200 Fig. 1 Time (S) Load Transient Response Fig. 2 Time (S) Line Transient Response 4 AIC1084 n TYPICAL 1.35 PERFORMANCE CHARACTERISTICS Minimum Operating Current (mA) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1 (Continued) Minimum differential Voltage (V) 1.30 1.25 1.20 1.15 1.10 1.05 0 1 2 3 4 5 2 3 4 5 Fig. 3 5 Output Current (A) Dropout Voltage (V OUT=3.3V) 8 7 Differential Voltage (V) Fig. 4 Minimum Operating Current Minimum Operating Current (mA) 4 Short Circuit Current (A) 1 2 3 4 5 6 7 8 9 6 5 4 3 2 1 3 2 1 0 0 1 2 3 4 5 6 7 Differential Voltage (V) Fig. 5 Minimum Operating Current VIN-V OUT (V) Fig. 6 AIC1084 (ADJ.) Short Circuit Current -20 Ripple Rejection Ratio (dB) -30 C OUT=3.3F -40 -50 COUT=10F -60 -70 -80 1 10 2 10 3 10 4 10 C OUT=25F 5 10 6 10 7 10 Frequency (Hz) Fig. 7 AIC1084 (ADJ.) Ripple Rejection 5 AIC1084 n PHYSICAL DIMENSIONS l TO-220 (unit: mm) A E F 3.810.27 SYMBOL A D E e e1 e2 F J1 L MIN 3.56 14.23 9.66 2.29 0.50 0.51 2.04 12.70 MAX 4.82 16.51 10.66 2.79 1.15 1.10 1.39 2.92 14.73 D L e1 J1 e e2 6 |
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