DESCRIPTION
The LT®1271 and LT1269 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (LT1271 = 60kHz, LT1269 = 100kHz) and slightly lower switch current, they can be operated in all standard switching configurations includ ing buck, boost, flyback and inverting. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Integration of all functions allows the LT1271/LT1269 to be built in a standard TO-220 power package. This makes them extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.

FEATURES
■ Wide Input Voltage Range 3.5V to 30V
■ Low Quiescent Current: 7mA
■ Internal 4A Switch
■ Very Few External Parts Required
■ Self Protected Against Overloads
■ Shutdown Mode Draws Only 100µA Supply Current
■ Flyback Regulated Mode Has Fully Floating Outputs
■ Comes in Standard 5-Pin Package
■ Can Be Externally Synchronized (See LT1072 Data Sheet)

APPLICATIONS
■ Boost Converter
■ High Efficiency Buck Converter
■ PC Power Supply with Multiple Outputs
■ Battery Up-Converter
■ Negative-to-Positive Converter