General Description

The AS1325 is a high-efficiency step-up DC-DC converter designed to generate a fixed output voltage of +3.3V or +5V.

Key Features

■ Fixed Output Voltage:

- 3.3V (AS1325-BSTT-33) or 5V (AS1325-BSST-50)

■ Output Current:

- Up to 300mA (AS1325-BSTT-33) @ 2V VBATT

- Up to 185mA (AS1325-BSST-50) @ 2V VBATT

■ Internal Synchronous Rectifier

■ Shutdown Mode Supply Current: Less Than 1µA

■ Efficiency: Up to 96

■ Minimum Input Voltage: +1.5V

■ Accurate Shutdown Low-Battery Cutoff Threshold

■ Battery Input Connected to Pin OUT in Shutdown Mode for Backup Power

■ Antiringing Control Minimizes EMI

■ Ripple Reduction at Light Loads

■ 6-pin SOT23 Package

Applications

The AS1325 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equipment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, cordless phones, and PC cards. The device is also perfect as a local supply or as a battery backup.