LT1373 Datasheet | Linear Technology

LT1373 250k Hz Low Supply Current High Efficiency 1.5A Switching Regulator Features s s s s s s s s s s s DESCRIPTIO 1m A IQ at 250k Hz Uses Small Inductors: 15µH All Surface Mount ponents Only 0.6 Square Inch of Board Space Low Minimum Supply Voltage: 2.7V Constant Frequency Current Mode Current Limited Power Switch: 1.5A Regulates Positive or Negative Outputs Shutdown Supply Current: 12µA Typ Easy External Synchronization 8-Pin SO or PDIP Packages The LT ®1373 is a low supply current high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.” A 1.5A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. All functions of the LT1373 are integrated into 8-pin SO/PDIP packages. pared to the 500k Hz LT1372, which draws 4m A of quiescent current, the LT1373 switches at 250k Hz, typically consumes only 1m A and has higher efficiency. High frequency switching allows for small inductors to be used. All surface mount ponents consume less than 0.6 square inch of board space. 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. U APPLICATIO S s s s s s Boost Regulators CCFL Backlight Driver Laptop puter Supplies Multiple Output Flyback Supplies Inverting Supplies TYPICAL APPLICATIO 5V 5 OFF ON 4 S/S 5V-to-12V Boost Converter L1- 22µH D1 MBRS120T3 R1 215k...