DESCRIPTION
The LT®1579 is a dual input, single output, low dropout regulator. This device is designed to provide an uninterruptible output voltage from two independent input voltage sources on a priority basis. All of the circuitry needed to switch smoothly and automatically between inputs is incorporated.

FEATURES
■ Maintains Output Regulation with Dual Inputs
■ Dropout Voltage: 0.4V
■ Output Current: 300mA
■ 50µA Quiescent Current
■ No Protection Diodes Needed
■ Two Low-Battery Comparators
■ Status Flags Aid Power Management
■ Adjustable Output from 1.5V to 20V
■ Fixed Output Voltages: 3V, 3.3V and 5V
■ 7µA Quiescent Current in Shutdown
■ Reverse-Battery Protection
■ Reverse Current Protection
■ Remove, Recharge and Replace Batteries Without Loss of Regulation

APPLICATIONS
■ Dual Battery Systems
■ Battery Backup Systems
■ Automatic Power Management for Battery-Operated Systems