AAT1149

3MHz Fast Transient 400mA Step-Down Converter General Description The AAT1149 SwitchReg is a 3.0MHz step-down converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 1.0V. It is optimized to react quickly to load variations and operate with a tiny 0603 inductor that is only 1mm tall. The AAT1149 output voltage is programmable via external feedback resistors. It can deliver 400mA of load current while maintaining a low 45μA no load quiescent current. The 3.0MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1149 maintains high efficiency throughout the operating range, which is critical for portable applications. The AAT1149 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. AAT1149 Features SwitchReg™ Ultra-Small 0603 Inductor (Height = 1mm) VIN Range: 2.7V to 5.5V VOUT Adjustable from 1.0V to VIN 400mA Max Output Current Up to 98% Efficiency 45μA No Load Quiescent Current 3.0MHz Switching Frequency 70μs 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 Devices www.DataSheet4U.com Typical Applicatio...