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| ADVANCED INFORMATION AIC1594 1A STEP-DOWN PWM REGULATOR SPEC NO: DS-1594-P1 03/23/00 ! FEATURES " " " ! DESCRIPTION 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 components. 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 " " " " " " " " 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 Low Power Standby Mode, IQ Typically 80A TTL Shutdown Capability. Output Overvoltage Protection Current Limit and Thermal Shutdown Protection. 1A Guaranteed Output Current ! APPLICATIONS " " voltage feedback loop provides optimum output voltage accuracy and fast load transient response. Packages available are in SOP8 for SMD. standard SOT89-5 Simple High Efficiency Step-down regulator On-Card Switching regulators and DIP8 for standard assembly and TO263-5, ! TYPICAL APPLICATION CIRCUIT 1 VIN C1 IN + C2 OUT D1 4 R1 AIC1594 SHDN FB 2 L1 C3 + VOUT GND 3 R2 R1 short and R2 open for fixed switching output version 1A Precision PWM DC/DC Regulator ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw 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 AIC1594X- XXCX ORDER NUMBER PIN CONFIGURATION PACKAGE TYPE M: TO263-5 N: DIP8 S: SO8 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 AIC1594A(B)CM AIC1594A(B)-25CM AIC1594A(B)-33CM AIC1594A(B)-50CM AIC1594A(B)-12CM (TO263-5) AIC1594A(B)CN AIC1594A(B)-25CN AIC1594A(B)-33CN AIC1594A(B)-50CN AIC1594A(B)-12CN (DIP8) AIC1594A(B)CS AIC1594A(B)-25CS AIC1594A(B)-33CS AIC1594A(B)-50CS AIC1594A(B)-12CS (SO8) FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5. SHDN 12345 TOP VIEW IN 1 IN 2 OUT 3 OUT 4 8 SHDN 7 FB 6 GND 5 GND AIC1594A(B)CT AIC1594A(B)-25CT AIC1594A(B)-33CT AIC1594A(B)-50CT AIC1594A(B)-12CT (TO220-5) FRONT VIEW 1: IN 2. OUT 3. GND 4. FB 5.SHDN 12345 ! ABSOLUTE MAXIMUM RATINGS Supply Voltage .................................................................................................36V FB, SHDN Pin Input Voltage ...............................................................................25V Operating Temperature Range .................................................................. 0C ~ 70C Storage Temperature Range .............................................................. -65C ~ 150C ! TEST CIRCUIT Refer to Typical Application Circuit. ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw 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=25C, VIN=18V) PARAMETER Input Voltage Fixed Output Voltage AIC1594-25 (VIN > 4.5V) AIC1594-33 (VIN > 4.5V) AIC1594-50 (VIN > 7.0V ) AIC1594-12 (VIN > 15V ) Feedback Voltage Output Voltage Regulation Quiescent Current Shutdown Quiescent Current Logic Input High Logic Input Low Oscillator Frequency Oscillator Frequency Output Current Limit Over Voltage Protection Maximum Duty Cycle Efficiency Vo=5V , Io=2A 100 90 Internal switch off SHDN = 5V (OFF) (Regulator OFF) (Regulator ON ) AIC1594A series AIC1594B series 1.0 150 300 1.5 120 KHz A % % % 2 0.8 1 80 AIC1594 Adjustable TEST CONDITIONS MIN. 4.5 TYP. MAX. 36 UNIT V V V V V V 2.5 3.3 5.0 12.0 1.25 4 5 % mA A V V ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw 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 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 80A. Drive it high to disable the reference , control circuitry , and internal switches .Drive low or connect to GND for normal operation. PIN 2:OUT PIN 3: GND SO8, DIP8 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 1, 2: IN PIN 7: 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 80A. Drive it high to disable the reference , control circuitry , and internal switches .Drive low or connect to GND for normal operation. PIN 8: ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw 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 FB Current Limit COMP. AMP. COMP. 2.5V Regulator ON / OFF Compensation Circuit Latch Driver OUT 150/300 KHz OSC Thermal Shutdown GND ! PHYSICAL DIMENSIONS " 8 LEAD PLASTIC SO (unit: mm) D SYMBOL A A1 H E MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40 MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27 B C D E e A C A1 e H L L 1.27(TYP) B ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw 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 SYMBOL A1 E1 MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92 MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81 A2 b C E D E E1 C A2 A1 L e eB 2.54 (TYP) b e eB L ANALOG INTEGRATIONS CORPORATION 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. www.analog.com.tw TEL: (8863)577-2500 FAX:(8863)577-2510 6 |
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