LT1371 Datasheet | Linear Technology

LT1371 500k Hz High Efficiency 3A Switching Regulator Features s s s s s s s s s DESCRIPTION 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 4m A 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 external logic level source. A logic low on the Shutdown pin reduces supply current to 12µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency pensation techniques. Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external ponents during overload conditions. , LTC and LT are registered trademarks of Linear Technology Corporation. Faster Switching with Increased Efficiency Uses Small Inductors: 4.7µH All Surface Mount ponents Low Minimum Supply Voltage: 2.7V Quiescent Current: 4m A Typ Current Limited Power Switch: 3A Regulates Positive or Negative Outputs Shutdown Supply Current: 12µA Typ Easy External Synchronization U APPLICATIONS s s s s Boost Regulators Laptop puter Supplies Multiple Output Flyback Supplies Inverting Supplies TYPICAL APPLICATION 5V to 12V Boost Converter 5V L1- 4.7µH D1 MBRS330T3 VOUT† 12V VIN OFF ON S/S LT1371 VSW EFFICIENCY (%) R1 53.6k 1% + C1- - 22µF 25V FB GND C2 0.047µF R3 2k VC + R2 6.19k 1% C3 0.0047µF - TA01 C4- - 22µF 25V ×2 - COILCRAFT DO3316P-472 (4.7µH), DO3316P-103 (10µH) OR SUMIDA CD104-100MC (10µH) - - AVX TPSD226M025R0200 † MAX IOUT L1 IOUT 4.7µH 0.7A 10µH...