DESCRIPTION
The LT ®1572 is a 1.25A 100kHz monolithic switching regulator with on-board switch and catch diode included in one package. It combines an LT1172 with a 1A Schottky catch diode. The LT1572 can be operated in all standard switching configurations, including boost, buck, SEPIC, flyback, forward, inverting and “Cuk”. All necessary control, oscillator and protection circuitry is included on the die with the high efficiency switch. This makes the part extremely easy to use and provides “bustproof” operation similar to that obtained with 3-pin linear regulators.

FEATURES
■ Catch Diode Included in Package
■ Wide Input Voltage Range: 3V to 30V
■ Low Quiescent Current: 6mA
■ Internal 1.25A Switch
■ Very Few External Parts Required
■ Self-Protected Against Overloads
■ Operates in Nearly All Switching Topologies
■ Shutdown Mode Draws Only 50µA Typical Current
■ Can Be Externally Synchronized

APPLICATIONS
■ 3.3V-to-5V and 5V-to-12V Boost Converters
■ Negative-to-Positive Converter
■ SEPIC Converter (Input Can Be Greater or
   Less Than Output)
■ Battery Charger