AAT3143ITP-T1

更新时间： 2024-02-19 08:20:07

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
11页	478K
描述
High Efficiency 1X/1.5X/2X Charge Pump with PWM Control for White LED Applications

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AAT3143ITP-T1 数据手册

AAT3143

High Efficiency 1X/1.5X/2X Charge Pump with

PWM Control for White LED Applications

™

ChargePump

General Description

Features

The AAT3143 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-

mode load switch (1X), fractional (1.5X), and dou-

bling (2X) conversion to maximize efficiency for

white LED applications. The AAT3143 can deliver

current levels up to 80mA to drive white LEDs con-

nected to the four current source outputs from a

2.7V to 5.5V input. The current source outputs may

source up to 20mA each and may be operated indi-

vidually or in parallel for driving higher-current

LEDs. A low external parts count (two 1µF flying

capacitors and two small 1µF capacitors at V_INand

V_OUT) makes the AAT3143 ideally suited for small

battery-powered applications.

•

Input Voltage Range: 2.7V to 5.5V

PWM Brightness Control

Tri-Mode 1X, 1.5X, and 2X Charge Pump for

Maximum Efficiency and V_FCoverage

Drives Four Low- or High-V_FType LEDs

Up to 20mA LED Current per Channel

No Inductors

1MHz Switching Frequency

Small Application Circuit

AutoBias™ Technology

I_Q<1µA in Shutdown

•

2.85x3.0mm TSOPJW-12 Package

Output current, and therefore brightness, is con-

trolled via externally applied Pulse Width Modulation

(PWM) control. Typically, PWM frequencies of up to

50kHz can be applied.

Applications

•

Programmable Current Sources

White LED Backlighting

White Photo Flash for Digital Still Cameras

The AAT3143 has a thermal management system to

protect the device in the event of a short-circuit con-

dition at the voltage output pin. Built-in soft-start cir-

cuitry prevents excessive inrush current during start-

up. A high charge pump switching frequency allows

the use of very small external capacitors. A low cur-

rent shutdown feature disconnects the load from V_IN

and reduces quiescent current to less than 1µA.

The AAT3143 is available in a Pb-free, space-sav-

ing, 2.85x3.0mm 12-pin TSOPJW package.

Typical Application

2.7V to 5.5V

C1+

1µF

C_IN

1µF

C1-

C2+

1µF

C2-

AAT3143

C_OUT

1µF

PWM/EN

EN/PWM

GND

3143.2006.05.1.0

12 3 4 5 6 7...11

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