Datasheet > AAT1149

AAT1149

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
20页	1820K
描述
3MHz Fast Transient 400mA Step-Down Converter

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AAT1149 数据手册

AAT1149

3MHz Fast Transient

400mA Step-Down Converter

™

SwitchReg

General Description

Features

The AAT1149 SwitchReg is a 3.0MHz step-down

converter with an input voltage range of 2.7V to

5.5V and output voltage as low as 1.0V. It is opti-

mized to react quickly to load variations and oper-

ate with a tiny 0603 inductor that is only 1mm tall.

•

Ultra-Small 0603 Inductor (Height = 1mm)

V_INRange: 2.7V to 5.5V

V_OUTAdjustable from 1.0V to V_IN

400mA Max Output Current

Up to 98% Efficiency

45μA No Load Quiescent Current

3.0MHz Switching Frequency

70μs Soft Start

Fast Load Transient

Over-Temperature Protection

Current Limit Protection

100% Duty Cycle Low-Dropout Operation

<1μA Shutdown Current

SC70JW-8 Package

The AAT1149 output voltage is programmable via

external feedback resistors. It can deliver 400mA of

load current while maintaining a low 45μA no load

quiescent current. The 3.0MHz switching frequen-

cy minimizes the size of external components while

keeping switching losses low.

The AAT1149 maintains high efficiency throughout

the operating range, which is critical for portable

applications.

Temperature Range: -40°C to +85°C

The AAT1149 is available in a Pb-free, space-saving

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

the -40°C to +85°C temperature range.

Applications

•

Cellular Phones

Digital Cameras

Handheld Instruments

Microprocessor / DSP Core / IO Power

PDAs and Handheld Computers

USB Devices

Typical Application

V_IN= 3.6V

V_OUT= 1.8V

L1 1.8µH

AAT1149

4.7µF

118k

PGND

AGND

PGND

59k

4.7µF

1149.2006.11.1.0

12 3 4 5 6 7...20

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