View lt1111 datasheet:

LT1111 Micropower DC/DC Converter Adjustable and Fixed 5V, 12V DESCRIPTIO FEATURES Operates at Supply Voltages from 2V to 30V The LT1111 is a versatile micropower DC/DC converter. 72kHz Oscillator The device requires only three external components to Works with Surface Mount Inductors deliver a fixed output of 5V or 12V. Supply voltage ranges Only Three External Components Required from 2V to 12V in step-up mode and to 30V in step-down Step-Up or Step-Down Mode mode. The LT1111 functions equally well in step-up, step- Low-Battery Detector Comparator On-Chip down, or inverting applications. User Adjustable Current Limit The LT1111 oscillator is set at 72kHz, optimizing the Internal 1A Power Switch device to work with off-the-shelf surface mount inductors. Fixed or Ad