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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