AAT1147IJS-0.6-T1 データシートの表示（PDF） - Analog Technology Inc

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AAT1147IJS-0.6-T1

High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter

Analog Technology Inc 

AAT1147

High Efficiency, Low Noise, Fast Transient

400mA Step-Down Converter

General Description

Features

SwitchReg™

The AAT1147 SwitchReg is a member of

AnalogicTech's Total Power Management IC™

(TPMIC™) product family. It is a fixed frequency

1.4MHz step-down converter with an input volt-

age range of 2.7V to 5.5V and output voltage as

low as 0.6V.

The AAT1147 is optimized for low noise portable

applications, reacts quickly to load variations, and

reaches peak efficiency at heavy load.

The AAT1147 output voltage is programmable with

external feedback resistors. It can deliver 400mA

of load current while maintaining high power effi-

ciency. The 1.4MHz switching frequency mini-

mizes the size of external components while keep-

ing switching losses low.

The AAT1147 is available in a Pb-free, space-sav-

ing 2.0x2.1mm SC70JW-8 package and is rated

over the -40°C to +85°C temperature range.

• VIN Range: 2.7V to 5.5V

• VOUT Adjustable from 0.6V to VIN

• 400mA Output Current

• Up to 98% Efficiency

• Low Noise, 1.4MHz Fixed Frequency PWM

Operation

• Fast Load Transient

• 150µs Soft Start

• Over-Temperature and Current Limit

Protection

• 100% Duty Cycle Low Dropout Operation

• <1µA Shutdown Current

• 8-Pin SC70JW Package

• Temperature Range: -40°C to +85°C

Applications

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Microprocessor/DSP Core /IO Power

• PDAs and Handheld Computers

• USB devices

Typical Application

VIN

C2

4.7μF

U1

AAT1147

3 VIN

LX 4

1 EN

OUT 2

5 AGND PGND 7

8 PGND PGND 6

VO = 1.8V

L1

4.7μH R1

118k

R2

59k

C1

4.7μF

1147.2006.05.1.0

1

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