AAT1152 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT1152

850kHz 1A Buck DC/DC Converter

Advanced Analogic Technologies 

General Description

The AAT1152 SwitchReg is a step-down switching

converter ideal for applications where high efficien-

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

deliver 1A with internal power MOSFETs, the cur-

rent mode controlled IC is internally compensated

for simplified system design and low external parts

count.

The AAT1152 features a Power-OK (POK) function

which monitors the output, alerting the system if

the output voltage falls out of regulation.

The AAT1152 is available in a Pb-free MSOP-8

package and is rated over the -40°C to +85°C tem-

perature range.

AAT1152

850kHz 1A Buck DC/DC Converter

Features

SwitchReg™

• 5.5V Max Supply Input

• Fixed or Adjustable VOUT 1.0V to 4.2V

• 1A Output Current

• Integrated Low On Resistance Power Switches

• Up to 95% Efficiency

• Power-OK Signal

• Internally Compensated Current Mode Control

• High Initial Accuracy: ±1%

• 850kHz 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

100k

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

AAT1152 FB

POK

LX

ENABLE

VCC

SGND PGND

4.1μH

3 x 22μF

OUTPUT

1152.2006.09.1.7

1

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