Datasheet > AAT1149_08

AAT1149_08

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
21页	1511K
描述
3MHz Fast Transient 400mA Step-Down Converter

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AAT1149_08 数据手册

PRODUCT DATASHEET

AAT1149

SwitchReg^TM

3MHz FastTransient 400mA Step-Down Converter

General Description

Features

The AAT1149 SwitchReg is a 3.0MHz step-down con-

verter with an input voltage range of 2.7V to 5.5V and

output voltage as low as 1.0V. It is optimized to react

quickly to load variations and operate 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 or 0.9x1.2mm WLCSP Package

• Temperature Range: -40°C to +85°C

The AAT1149 output voltage is programmable via exter-

nal feedback resistors. It can deliver 400mA of load cur-

rent while maintaining a low 45μA no load quiescent

current. The 3.0MHz switching frequency 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.

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

2.0x2.1mm SC70JW-8 package or a 5-pin wafer-level

chip scale (WLCSP) 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

AAT1149

L1 1.8µH

4.7µF

118k

PGND

AGND

PGND

59k

4.7µF

w w w . a n a l o g i c t e c h . c o m

1149.2008.08.1.3

12 3 4 5 6 7...21

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