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LT1371HVCT7 Datasheet(PDF) 1 Page - Linear Technology |
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LT1371HVCT7 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1371 500kHz High Efficiency 3A Switching Regulator The LT ®1371 is a monolithic high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.” A 3A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. The LT1371 typically consumes only 4mA quiescent current and has higher efficiency than previous parts. High frequency switching allows for very small inductors to be used. New design techniques increase flexibility and maintain ease of use. Switching is easily synchronized to an exter- nal logic level source. A logic low on the Shutdown pin reduces supply current to 12 µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation tech- niques. Nonlinear error amplifier transconductance re- duces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external compo- nents during overload conditions. DESCRIPTION s Faster Switching with Increased Efficiency s Uses Small Inductors: 4.7 µH s All Surface Mount Components s Low Minimum Supply Voltage: 2.7V s Quiescent Current: 4mA Typ s Current Limited Power Switch: 3A s Regulates Positive or Negative Outputs s Shutdown Supply Current: 12 µA Typ s Easy External Synchronization s Boost Regulators s Laptop Computer Supplies s Multiple Output Flyback Supplies s Inverting Supplies APPLICATIONS TYPICAL APPLICATION 5V to 12V Boost Converter OUTPUT CURRENT (A) 0.01 50 60 70 80 90 0.1 1 LT1371 • TA02 100 VIN = 5V 12V Output Efficiency LT1371 VIN VC 5V GND FB LT1371 • TA01 VSW S/S L1* 4.7 µH C1** 22 µF 25V C4** 22 µF 25V × 2 C2 0.047 µF C3 0.0047 µF R3 2k R2 6.19k 1% R1 53.6k 1% VOUT † 12V D1 MBRS330T3 ON OFF * ** COILCRAFT DO3316P-472 (4.7 µH), DO3316P-103 (10 µH) OR SUMIDA CD104-100MC (10 µH) AVX TPSD226M025R0200 + + L1 4.7 µH 10 µH IOUT 0.7A 0.8A †MAX I OUT FEATURES , LTC and LT are registered trademarks of Linear Technology Corporation. |
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