AIC1084 5A Low Dropout Positive Adjustable Regulator n FEATURES n DESCRIPTION l Dropout Voltage 1.3V at 5A Output Current. The AIC1084 is a low dropout three terminal l Fast Transient Response. regulator with 5A output current capability. The l Extremely Tight Line and Load Regulation. output voltage is adjustable with the use of a l Current Limiting and Thermal Protection. resistor divider or fixed 3.3V. Dropout voltage is l Adjustable Output Voltage or Fixed 1.5V, 1.8V, guaranteed to be at maximum of 1.4V with the 3.3V. maximum output current. Its low dropout voltage Standard 3-Pin Power Packages. and fast transient response make it ideal for low l voltage microprocessor applications. Current limit n APPLICATIONS and thermal protection provide protection against l Mother Board I/O Power Supplies. any overload condition that would create excessive l Microprocessor Power Supplies. junction temperatures. l High Current Regulator. l Post Regulator for Switching Supply. n TYPICAL APPLICATION CIRCUIT 3 VIN 5V AIC1084 2 1 ADJ C1 + 10µF VOUT 3.3V RF1 125Ω 1% + C2 RF2 10µF 205Ω 1% VREF VR E F=VOUT - VADJ =1.25V (typ.) VOUT =VREF x (1+RF2/RF1)+ IADJ x RF2 IADJ =55µA (typ.) (1) C1 needed if device is far away from filter capacitors. (2) C2 required for stability. Adjustable Voltage Regulator 3 VIN 5V AIC1084-33 2 VOUT 3.3V 1 C1 + 10µF + C2 10µF GND Fixed Voltage Regulator Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1084-03 TEL: 886-3-5772500 Sep 21, 01 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1084 n ORDERING INFORMATION AIC1084-XXCX ORDER NUMBER PACKAGING TYPE E: TO-252 M: TO-263 T: TO-220 MA: TO-263AA AIC1084CE (TO-252) OUTPUT VOLTAGE DEFAULT: ADJ. 15: 1.5V 18: 1.8V 33: 3.3V AIC1084CM (TO-263) AIC1084CMA (TO-263AA) AIC1084CT (TO-220) PIN CONFIGURATION FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 1 2 3 FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 3 FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 FRONT VIEW 1: ADJ (GND) 2: VOUT (TAB) 3: VIN 1 2 3 n ABSOLUTE MAXIMUM RATINGS VIN pin to ADJ/GND pin ......................… … ...............… … … .......................… ........... 7V Operating Junction Temperature Range ..................… … … … … ...................... 0°C~ 125°C Storage Temperature Range ...............................… … … .… … ................. - 65°C ~ 150°C Thermal Resistance Junction to Case TO-252 … … … … … … … … … … … … … 15°C/W TO-263, TO263AA, TO-220.....… … … .... Thermal Resistance Junction to Ambient 6°C /W TO-252 … … … … … … … … … … ..… 100°C/W (Assume no ambient airflow, no heatsink) TO-263 … .....… … .....… … … … … ... 60°C /W TO-263AA TO-220 Lead Temperature (Soldering) 10 sec. … ..… … ..… … .....… … ... 60°C /W … ....… … ....… … … … … … .. 50°C /W .....................… … … ..… ............… … ..… .......260°C 2 AIC1084 n TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT. n ELECTRICAL CHARACTERISTICS (V IN =5V, TJ=25°C, IO=10mA, Unless otherwise specified) PARAMETER Reference Voltage Output Voltage Line Regulation TEST CONDITIONS MIN. TYP. MAX. UNIT 1.238 1.25 1.262 V AIC1084-15 VIN =5V 1.48 1.50 1.52 AIC1084-18 VIN =5V 1.78 1.80 1.82 AIC1084-33 VIN =5V 3.26 3.30 3.34 0.015 0.2 % 0.6 % 1.4 V AIC1084 (ADJ) TJ =25°C V ADJ : 2.65V ≤ VIN ≤7V VOUT=1.25V Fix : VOUT+1.4V≤ VIN ≤7V TJ =25°C Load Regulation 10mA < IO < 5A TJ =25°C ∆VOUT, ∆VREF =1% Dropout Voltage 10mA ≤ IO ≤ 5A 1.3 0°C ≤TJ ≤125°C Current Limit 0°C ≤ TJ ≤125°C Adjusted Pin Current 2.65V ≤ VIN ≤ 7V Adjusted Pin Current Change 2.65V ≤ VIN ≤ 7V (∆IADJ) 0°C ≤TJ ≤125°C Temperature Stability 5 IO=0.5A 6 A 55 120 µA 0.2 5 µA 0°C ≤TJ ≤125°C 0.5 Minimum Load Current 0°C ≤TJ ≤125°C 5 RMS Output Noise (% of VOUT) 10Hz ≤ f ≤ 10KHz % 10 mA 0.003 % 72 dB 120Hz input ripple Ripple Rejection Ratio COUT=25µF 60 (V IN -V OUT)=3V 3 AIC1084 n BLOCK DIAGRAM VIN + GM V REF + 1.25V Current Amp. - Thermal Limit Current Limit 55µA VOUT For fixed voltage device GND ADJ n PIN DESCRIPTIONS ADJ PIN - Providing VREF=1.25V (typ.) for adjustable VOUT. VREF=VOUT-V ADJ and IADJ=55µA (typ.) GND PIN- Power ground. VOUT PIN - Adjustable output voltage. VIN PIN Power Input. - n TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage (mV, AC) Output Voltage (V, AC) 0.4 0.2 50 0 -50 -0.2 VIN =5.0V CIN=1µF(Tantalum) COUT =10µF(Tantalum) VOUT=3.3V -100 Input Voltage (V) -0.4 Load Current 0 2.5A 0.1A 0 20 Fig. 1 40 60 80 Time (µS) Load Transient Response 100 CIN=1µF (Tantalum) COUT =10µF (Tantalum) VOUT=3.3V 7.0 6.0 0 40 Fig. 2 80 120 160 200 Time (µS) Line Transient Response 4 AIC1084 n TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Minimum Operating Current (mA) Minimum differential Voltage (V) 1.35 1.30 1.25 1.20 1.15 1.10 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 1.05 0 1 2 3 4 0 5 2 3 4 5 Differential Voltage (V) Fig. 4 Minimum Operating Current Output Current (A) Dropout Voltage (V OUT=3.3V) Fig. 3 5 8 7 Short Circuit Current (A) Minimum Operating Current (mA) 1 4 3 2 1 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 0 9 Differential Voltage (V) Fig. 5 1 2 3 4 5 6 7 VIN-V OUT (V) Minimum Operating Current Fig. 6 AIC1084 (ADJ.) Short Circuit Current Ripple Rejection Ratio (dB) -20 C OUT=3.3µF -30 -40 COUT=10µF -50 -60 C OUT=25µF -70 -80 1 10 2 10 3 10 4 10 5 10 6 10 7 10 Frequency (Hz) Fig. 7 AIC1084 (ADJ.) Ripple Rejection 5 AIC1084 n PHYSICAL DIMENSIONS TO-220 (unit: mm) A E F Φ3.81±0.27 l D SYMBOL MIN MAX A 3.56 4.82 D 14.23 16.51 E 9.66 10.66 e 2.29 2.79 e1 0.50 1.15 e2 - 1.10 F 0.51 1.39 J1 2.04 2.92 L 12.70 14.73 L e1 J1 e e2 6