AIC1596 ADVANCED INFORMATION 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 ! DESCRIPTION ! FEATURES " " " " " " " " " " " Operating Input Voltage From 4.5V to 36V 2.5V, 3.3V, 5V , 12V and Adjustable Output Version Adjustable Version Output Voltage Range , 1.25V to 30V ± 4% max Over Line and Load Regulation Available in TO220-5 and TO263-5 Package Requires Only 4 External Components. 150KHz/300KHz Fixed Constant Frequency The AIC1596 series are step-down monolithic PWM regulators delivering 3A at fixed voltages of 2.5V , 3.3V, 5.0V , 12V and using a external divider to adjust output voltage from 1.25V to 30V with excellent line and load regulation. Switching frequency up to 150KHz/300KHz are achievable thus allowing smaller sized filter com- Low Power Standby Mode, IQ Typically 80µA TTL Shutdown Capability. Output Overvoltage Protection Current Limit and Thermal Shutdown Protection. 3A Guaranteed Output Current ponents. Internal current limit and thermal shutdown circuits provide protection from overloads. It also provides output overvoltage and short protection under fault conditions. The internal precious reference combined with voltage feedback loop provides optimum output ! APPLICATIONS " " " voltage accuracy and fast load transient response. Simple High Efficiency Step-down regulator On-Card Switching regulators Fixed Voltage power supply for LCD Monitor Packages available are in standard TO220-5 for standard assembly and TO263-5 for SMD. ! TYPICAL APPLICATION CIRCUIT 1 VIN OUT IN 2 + C1 L1 C2 AIC1596 5 SHDN D1 4 VOUT + C3 R1 FB GND 3 R2 R1 short and R2 open for fixed switching output version 3A Precision PWM DC/DC Regulator ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1 AIC1596 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 ! ORDERING INFORMATION XXCX AIC1596X PIN CONFIGURATION ORDER NUMBER PACKAGE TYPE M: TO263-5 T: TO220-5 OUTPUT VOLTAGE DEFAULT: Adj. 25: 2.5V 33: 3.3V 50: 5.0V 12: 12.0V FREQUENCY VERSION A: 150KHZ B: 300KHZ AIC1596A(B)CM AIC1596A(B)-25CM AIC1596A(B)-33CM AIC1596A(B)-50CM AIC1596A(B)-12CM (TO263-5) AIC1596A(B)CT AIC1596A(B)-25CT AIC1596A(B)-33CT AIC1596A(B)-50CT AIC1596A(B)-12CT (TO220-5) FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. SHDN FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5.SHDN 12 3 4 5 1 2 3 4 5 ! ABSOLUTE MAXIMUM RATINGS Supply Voltage ……………..……………......……………...............……………….............36V FB, SHDN Pin Input Voltage……………..……….......…………….…………….................25V Operating Temperature Range …….………..……...............…….…………....... 0°C ~ 70°C Storage Temperature Range ……...................……..…….…………………. –65°C ~ 150°C ! TEST CIRCUIT Refer to Typical Application Circuit. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 2 AIC1596 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 ELECTRICAL CHARACTERISTICS (TJ=25°°C, VIN=18V) PARAMETER TEST CONDITIONS MIN. Input Voltage TYP. 4.5 Fixed Output Voltage Feedback Voltage UNIT 36 V AIC1596-25 (VIN > 4.5V) 2.5 V AIC1596-33 (VIN > 4.5V) 3.3 V AIC1596-50 (VIN > 7.0V ) 5.0 V AIC1596-12 (VIN > 15V ) 12.0 V AIC1596 Adjustable 1.25 V Output Voltage Regulation Quiescent Current Internal switch off 1 Shutdown Quiescent Current SHDN = 5V (OFF) 80 Logic Input High (Regulator OFF) Logic Input Low (Regulator ON ) Oscillator Frequency AIC1596A series 150 Oscillator Frequency AIC1596B series 300 4 % 5 mA µA 2 V 0.8 Output Current Limit 3.0 Over Voltage Protection 100 Vo=5V , Io=3A V KHz A 120 Maximum Duty Cycle Efficiency MAX. % % 90 % ! PIN DESCRIPTIONS PIN 1: IN PIN 2:OUT PIN 3: GND Supply voltage input for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Internal switch. The voltage at this pin switches between (VIN-VSAT) and approximately –0.5V, with a duty cycle of approximately VOUT/VIN. Ground requires a short, low noise connection to ensure good load regulation. PIN 4: FB Feedback input for fixed-output or adjustable-output version. Connect directly to output for fixed operation version or to a resistor divider for adjustable operation versions. PIN 5: SHDN Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 80µA. Drive it high to disable the reference, control circuitry and internal switches. Drive low or connect to GND for normal operation. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 3 AIC1596 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 ! BLOCK DIAGRAM SHDN IN 1.25 V 2.5V Regulator Reference ON / OFF FB Current Limit COMP. AMP. COMP. Latch Compensation Driver Circuit OUT ! PHYSICAL DIMENSIONS " TO-263-5L (unit: mm) E Thermal KHz OSC Shutdown A L2 D 150/300 L L1 B e C GND SYMBOL MIN MAX A 4.07 4.83 B 1.45 1.96 C 0.36 0.64 C2 1.14 1.40 D 8.63 9.66 E 9.78 10.54 E 0.71 1.02 L 15.11 15.59 L1 2.28 2.80 L2 - 1.40 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 4 AIC1596 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 " TO-220-5 (unit: mm) A E F H1 D L e e2 SYMBOL A D E e e1 e2 F H1 J1 L MIN 4.06 8.35 9.78 1.57 0.76 0.33 1.14 5.46 2.29 13.21 MAX 4.83 8.89 10.54 1.85 1.02 0.64 1.40 6.86 3.18 14.73 J1 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 5