AIC1594 ADVANCED INFORMATION 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-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 AIC1594 series are step-down monolithic PWM regulators delivering 1A 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. 1A 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 Packages available are in standard SOT89-5 and DIP8 for standard assembly and TO263-5, SOP8 for SMD. ! TYPICAL APPLICATION CIRCUIT 2 1 IN VIN + C2 C1 OUT L1 AIC1594 SHDN FB D1 + C3 VOUT 4 R1 GND 3 R2 R1 short and R2 open for fixed switching output version 1A 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 AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-P1 03/23/00 ! ORDERING INFORMATION XXCX AIC1594X PIN CONFIGURATION ORDER NUMBER PACKAGE TYPE M: TO263-5 N: DIP8 S: SO8 T: TO220-5 AIC1594A(B)CM AIC1594A(B)-25CM AIC1594A(B)-33CM AIC1594A(B)-50CM AIC1594A(B)-12CM (TO263-5) OUTPUT VOLTAGE DEFAULT: Adj. 25: 2.5V 33: 3.3V 50: 5.0V 12: 12.0V FREQUENCY VERSION A: 150KHZ B: 300KHZ AIC1594A(B)CN AIC1594A(B)-25CN AIC1594A(B)-33CN AIC1594A(B)-50CN AIC1594A(B)-12CN (DIP8) FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. SHDN TOP VIEW IN 1 8 SHDN IN 2 7 FB 6 GND OUT 3 OUT 4 AIC1594A(B)CS AIC1594A(B)-25CS AIC1594A(B)-33CS AIC1594A(B)-50CS AIC1594A(B)-12CS (SO8) AIC1594A(B)CT AIC1594A(B)-25CT AIC1594A(B)-33CT AIC1594A(B)-50CT AIC1594A(B)-12CT (TO220-5 ) 1 2 3 4 5 FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5.SHDN 5 GND 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 AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-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 MAX. UNIT 36 V AIC1594-25 (VIN > 4.5V) 2.5 V AIC1594-33 (VIN > 4.5V) 3.3 V AIC1594-50 (VIN > 7.0V ) 5.0 V AIC1594-12 (VIN > 15V ) 12.0 V AIC1594 Adjustable 1.25 V Output Voltage Regulation 4 % 5 mA 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 AIC1594A series 150 Oscillator Frequency AIC1594B series 300 KHz 1.5 A 120 % Output Current Limit 2 Over Voltage Protection Efficiency V 0.8 1.0 Maximum Duty Cycle µA 100 Vo=5V , Io=2A V % 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 AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-P1 03/23/00 ! PIN DESCRIPTIONS TO-220-5, TO-263-5 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. SO8, DIP8 PIN 1, 2: IN 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. PIN 3, 4: OUT Internal switch. The voltage at this pin switches between ( VIN-VSAT) and approximately –0.5V, with a duty cycle of approximately VOUT/VIN. PIN 5, 6: GNDGround requires a short, low noise connection to ensure good load regulation. PIN 7: PIN 8: 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. 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 4 AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-P1 03/23/00 ! 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 PHYSICAL DIMENSIONS " 8 LEAD PLASTIC SO (unit: mm) D SYMBOL MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.33 0.51 C 0.19 0.25 D 4.80 5.00 E 3.80 4.00 H E e e A A1 C B 1.27(TYP) H 5.80 6.20 L 0.40 1.27 L 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 AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-P1 03/23/00 " 8 LEAD PLASTIC DIP (unit: mm) D E1 E A2 A1 MIN MAX A1 0.381 — A2 2.92 4.96 b 0.35 0.56 C 0.20 0.36 D 9.01 10.16 E 7.62 8.26 E1 6.09 7.12 C L e eB b SYMBOL e 2.54 (TYP) eB — 10.92 L 2.92 3.81 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 6