AAT1146

Fast Transient 400mA Step-Down Converter General Description The AAT1146 SwitchReg is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family. It is a 1.4MHz stepdown converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 0.6V. It is optimized to react quickly to a load variation. The AAT1146 is available in fixed voltage versions with internal feedback and a programmable version with external feedback resistors. It can deliver 400mA of load current while maintaining a low 27μA no load quiescent current. The 1.4MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1146 is designed to maintain high efficiency throughout the operating range, which is critical for portable applications. The AAT1146 is available in a Pb-free, space-saving 2.0x2.1mm SC70JW-8 package and is rated over the -40°C to +85°C temperature range. AAT1146 Features SwitchReg™ VIN Range: 2.7V to 5.5V VOUT Fixed or Adjustable from 0.6V to VIN 27μA No Load Quiescent Current Up to 98% Efficiency 400mA Max Output Current 1.4MHz Switching Frequency 120μs Soft Start Fast Load Transient Over-Temperature Protection Current Limit Protection 100% Duty Cycle Low-Dropout Operation <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 ...