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AAT1155

1MHz 2.5A Step-Down DC/DC Converter

Advanced Analogic Technologies 

AAT1155

1MHz 2.5A Step-Down DC/DC Converter

General Description

Features

SwitchReg™

The AAT1155 SwitchReg is a step-down switching

converter ideal for applications where high efficien-

cy, small size, and low ripple are critical. Able to

deliver 2.5A with an internal power MOSFET, the

current-mode controlled IC provides high efficien-

cy. Fully internally compensated, the AAT1155 sim-

plifies 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 tem-

perature range.

• 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

Typical Application

INPUT

10μF

100Ω

0.1μF

Applications

• Cable/DSL Modems

• Computer Peripherals

• High Efficiency Conversion from 5V or 3.3V

Supply

• Network Cards

• Set-Top Boxes

VP

FB

AAT1155 LX

LX

EN

VCC

GND

1.5μH

120μF

OUTPUT

1155.2006.09.1.7

1

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