General Description

The AAT1149B SwitchReg is a 2.2MHz step-down converter with an input voltage range of 2.2V to 5.5V. It is optimized to react quickly to load variations and operate with a tiny 0603 inductor that is only 1mm tall.

Features

• Ultra-Small 0603 Inductor (Height = 1mm)

• VIN Range: 2.2V to 5.5V

• VOUT Fixed 1.8V

• 400mA Max Output Current

• Up to 98 Efficiency

• 45μA No Load Quiescent Current

• 2.2MHz Switching Frequency

• 70μs Soft Start

• Fast Load Transient

• Over-Temperature Protection

• Current Limit Protection

• 100 Duty Cycle Low-Dropout Operation

• <1μA Shutdown Current

• 0.91 x 1.235mm WLCSP 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