General Description

The AAT1151 SwitchReg™ is a step-down switching converter ideal for applications where high efficiency is required over the full range of output load conditions. The 2.7V to 5.5V input voltage range makes the AAT1151 ideal for single-cell lithiumion/polymer battery applications. Capable of more than 700mA with internal MOSFETs, the currentmode controlled IC provides high efficiency using synchronous rectification. Fully integrated compensation simplifies system design and lowers external parts count.

Features

• VIN Range: 2.7V to 5.5V

• Up to 95 Efficiency

• High Initial Accuracy ±1

• 110mΩ RDS(ON) Internal Switches

• <1μA Shutdown Current

• 850kHz Switching Frequency

• Fixed VOUT or Adjustable VOUT ≥1.0V

• Integrated Power Switches

• Synchronous Rectification

• Current Mode Operation

• Internal Compensation

• Stable with Ceramic Capacitors

• PFM for Optimum Efficiency for All Load Conditions

• Internal Soft Start

• Over-Temperature Protection

• Current Limit Protection

• MSOP-8 and QFN33-16 Packages

• -40°C to +85°C Temperature Range

Applications

• Cellular Phones

• Digital Cameras

• MP3 Players

• Notebook Computers

• PDAs

• USB-Powered Equipment

• Wireless Notebook Adapters