Datasheet > AAT1157

AAT1157

更新时间： 2022-01-15 02:20:54

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
14页	395K
描述
1MHz 1.2A Buck DC/DC Converter

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AAT1157 数据手册

AAT1157

1MHz 1.2A Buck DC/DC Converter

™

SwitchReg

General Description

Features

The AAT1157 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 fixed

frequency and low ripple are required over the full

range of load conditions. The 2.7V to 5.5V input

voltage range makes the AAT1157 ideal for single-

cell lithium-ion/polymer battery applications.

Capable of up to 1.2A with internal MOSFETs, the

current-mode controlled IC provides high efficiency

over a wide operating range. Fully integrated com-

pensation simplifies system design and lowers

external parts count. The device operates at a

fixed 1MHz switching frequency across all load

conditions.

•

V_INRange: 2.7V to 5.5V

Up to 95% Efficiency

110 mΩ R_DS(ON)Internal Switches

<1µA Shutdown Current

1MHz Buck Switching Frequency

Fixed or Adjustable V_OUT≥ 0.8V

Integrated Power Switches

Current Mode Operation

Internal Compensation

Stable with Ceramic Capacitors

Constant PWM Operation for Low Output

Ripple

Internal Soft Start

Over-Temperature Protection

Current Limit Protection

•

16-Pin QFN 3x3mm Package

-40°C to +85°C Temperature Range

The AAT1157 is available in the Pb-free, 16-pin

3x3mm QFN package and is rated over the -40°C

to +85°C temperature range.

Applications

•

HDD MP3 Players

Notebook Computers

PDAs

Point-of-Load Regulation

Set Top Boxes

Smart Phones

Wireless Notebook Adapters

Typical Application

AAT1157

3.3V

2.5V

187k

100

3.0µH

10µF

VCC

N/C

59k

C3-C4

2x 22µF

PGND

0.1µF

SGND PGND

1157.2005.11.1.4

12 3 4 5 6 7...14

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