AIC1595 ADVANCED INFORMATION 2A STEP-DOWN PWM REGULATOR SPEC NO: DS-1595-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 AIC1595 series are step-down monolithic PWM regulators delivering 2A 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. 2A 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 L1 C2 C1 AIC1595 SHDN D1 + VOUT C3 4 FB R1 GND R2 R1 short and R2 open for fixed switching output version 2A 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 AIC1595 2A STEP-DOWN PWM REGULATOR SPEC NO: DS-1595-P1 03/23/00 ! ORDERING INFORMATION XXCX AIC1595X 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 AIC1595A(B)CM AIC1595A(B)-25CM AIC1595A(B)-33CM AIC1595A(B)-50CM AIC1595A(B)-12CM (TO263-5) AIC1595A(B)CT AIC1595A(B)-25CT AIC1595A(B)-33CT AIC1595A(B)-50CT AIC1595A(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 1 2 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 AIC1595 2A STEP-DOWN PWM REGULATOR SPEC NO: DS-1595-P1 03/23/00 ! ELECTRICAL CHARACTERISTICS (TJ=25°°C, VIN=18V) PARAMETER TEST CONDITIONS Input Voltage Fixed Output Voltage Feedback Voltage MIN. TYP. 4.5 UNIT 36 V AIC1595-25 (VIN > 4.5V) 2.5 V AIC1595-33 (VIN > 4.5V) 3.3 V AIC1595-50 (VIN > 7.0V ) 5.0 V AIC1595-12 (VIN > 15V ) 12.0 V AIC1595 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 AIC1595A series 150 Oscillator Frequency AIC1595B series 300 Output Current Limit 4 % 5 mA µA 2 V 0.8 2.0 Over Voltage Protection 100 Vo=5V , Io=2A V KHz A 120 Maximum Duty Cycle Efficiency MAX. % % 90 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 AIC1595 2A STEP-DOWN PWM REGULATOR SPEC NO: DS-1595-P1 03/23/00 ! PIN DESCRIPTIONS PIN 1: IN PIN 2:OUT PIN 3: GND ! 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. 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. BLOCK DIAGRAM SHDN IN 1.25 V Reference 2.5V Regulator ON / OFF FB Current Limit COMP. AMP. COMP. Latch Compensation Driver Circuit OUT 150/300 Thermal KHz OSC Shutdown GND 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 AIC1595 2A STEP-DOWN PWM REGULATOR SPEC NO: DS-1595-P1 03/23/00 ! PHYSICAL DIMENSIONS " TO-263-5L (unit: mm) E A L2 D L L1 B " e C 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 TO-220-5 (unit: mm) A E F H1 D L e e2 J1 SYMBOL MIN MAX A 4.06 4.83 D 8.35 8.89 E 9.78 10.54 e 1.57 1.85 e1 0.76 1.02 e2 0.33 0.64 F 1.14 1.40 H1 5.46 6.86 J1 2.29 3.18 L 13.21 14.73 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