General Description

The AAT1121 SwitchReg is a 1.5MHz step-down converter with an input voltage range of 2.7V to 5.5V and output as low as 0.6V. Its low supply current, small size, and high switching frequency make the AAT1121 the ideal choice for portable applications.

Features

• VIN Range: 2.7V to 5.5V

• VOUT Range: 0.6V to VIN

• 250mA Max Output Current

• Up to 96 Efficiency

• 30μA Typical Quiescent Current

• 1.5MHz Switching Frequency

• Soft-Start Control

• -Over-Temperature and Current Limit Protection

• 100 Duty Cycle Low-Dropout Operation

• <1μA Shutdown Current

• Small External Components

• Ultra-Small TDFN22-8 or STDFN22-8 Package

• Temperature Range: -40°C to +85°C

Applications

• Bluetooth™ Headsets

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Portable Music Players

• USB Devices