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AAT1155

1MHz 2.5A Step-Down DC/DC Converter

Analog Technology Inc 

AAT1155

1MHz 2.5A Step-Down DC/DC Converter

General Description

The AAT1155 SwitchReg™ is a member of

AnalogicTech's Total Power Management IC™

(TPMIC™) product family. The step-down switch-

ing converter is ideal for applications where high

efficiency, small size, and low ripple are critical.

Able to deliver 2.5A with an internal power MOS-

FET, 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 tem-

perature range.

Features

SwitchReg™

• 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 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

ENABLE

VCC

GND

1.5µH

120µF

OUTPUT

1155.2005.11.1.6

1

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