AAT1143

AAT1143 1MHz 400mA Step-Down Converter General Description The AAT1143 SwitchReg™ is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family. It 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. The AAT1143 is available in either a fixed version with internal feedback or a programmable version with external feedback resistors. It can deliver 400mA of load current while maintaining a low 25µA no load quiescent current. The 1MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1143 feedback and control delivers excellent load regulation and transient response with a small output inductor and capacitor. The AAT1143 is designed to maintain high efficiency throughout the operating range, which is critical for portable applications. The AAT1143 is available in a space-saving 2.0x2.1mm SC70JW-8 package and is rated over the -40°C to +85°C temperature range. Features SwitchReg™ 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 Temper...