Datasheet > AAT3177

AAT3177

更新时间： 2024-09-17 04:30:31

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
16页	771K
描述
High Current, High Efficiency Charge Pump with Auto-Timer

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AAT3177 数据手册

PRODUCT DATASHEET

AAT3177

ChargePump

High Current, High Efficiency Charge Pump with Auto-Timer

General Description

Features

The AAT3177 is a high output current, high efficiency,

low noise, low profile charge pump DC/DC converter.

The device is ideal for multi-functional LED photo-flash

applications where solution cost, size, and efficiency are

critical.

• Up to 800mA Output Current

• Tri-Mode 1X/1.5X/2X in Current Mode

• 16 Current Level Steps Set by S²Cwire

• Flash Auto-Timer (Active for High Current Levels

Only)

• External R_SETto Set Maximum Current

• <1μA of Shutdown

• Small Application Circuit

• No Inductors

• Automatic Soft Start

The AAT3177 is capable of driving a regulated output

current up to 800mA. Output current levels can be eas-

ily programmed in 16 steps through AnalogicTech’s

Simple Serial Control™ (S²Cwire™) interface controlled

by a single microcontroller GPIO line. This allows smooth

transitions and flexible adjustment of brightness in flash

or other lighting modes. The maximum output current

can also be set with an external R_SETresistor.

• 12-Pin TDFN 3x3mm Package

• -40°C to +85°C Temperature Range

Applications

• Camcorders

• Camera Phones

• Digital Still Cameras

• PDAs and Notebook PCs

• Smart Phones

The tri-mode (1X/1.5X/2X) operation of the internal

charge pump offers excellent power efficiency through-

out the output current range for both flash and movie

modes. Combined with a low external parts count (two

1μF flying capacitors and two small bypass capacitors at

V_INand OUT), the AAT3177 is ideally suited for small

battery-powered applications.

The AAT3177 has a thermal management system to pro-

tect the device in the event of a short-circuit condition at

the output pin. Built-in soft-start circuitry prevents

excessive inrush current during start-up. The shutdown

feature disconnects the load from V_INand reduces quies-

cent current to less than 1μA.

The AAT3177 is available in a Pb-free, thermally-

enhanced 12-pin 3x3mm TDFN package and is specified

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

Typical Application

1μF

C2+

C1+

VIN

C1- C2+

2.7V

to 5.5V

OUT

C_IN

4.7μF

C_OUT

Flash

2.2μF

AAT3177

LED

EN/SET

RSET

GND

0.1μF

187K

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

3177.2008.06.1.0

12 3 4 5 6 7...16

中文翻译

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