General Description

The AAT1155 SwitchReg is a step-down switching converter ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 2.5A with an internal power MOSFET, the current-mode controlled IC provides high efficiency. Fully internally compensated, the AAT1155 simplifies system design and lowers external parts count.

The AAT1155 is available in a Pb-free MSOP-8 package and is rated over the -40°C to +85°C temperature range.

Features

• 5.5V Max Supply Input

• Fixed or Adjustable VOUT: 1.0V to 4.2V

• 2.5A Output Current

• Up to 95 Efficiency

• Integrated Low On Resistance Power Switches

• Internally Compensated Current Mode Control

• 1MHz Switching Frequency

• Constant Pulse Width Modulation (PWM) Mode

• Low Output Ripple with Light Load

• Internal Soft Start

• Current Limit Protection

• Over-Temperature Protection

• MSOP-8 Package

• -40°C to +85°C Temperature Range

Applications

• Cable/DSL Modems

• Computer Peripherals

• High Efficiency Conversion from 5V or 3.3V Supply

• Network Cards

• Set-Top Boxes