General Description
The AAT1143 SwitchReg™ is a 1MHz 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 AAT1143 the ideal choice for portable applications.

Features
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable Down to 0.6V
    — Fixed or Adjustable Version
• 25μA No Load Quiescent Current
• Up to 95% Efficiency
• 400mA Max Output Current
• 1MHz Switching Frequency
• Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• 0.1μA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C

Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• USB Devices