AAT3134(2004) 查看數據表（PDF） - Analog Technology Inc

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AAT3134
(Rev.:2004)

High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

Analog Technology Inc 

AAT3134

High Efficiency 1X/1.5X Fractional

Charge Pump for White LED Applications

General Description

The AAT3134 is a low noise, constant frequency

charge pump DC/DC converter that uses a dual

mode Load Switch (1X) and fractional (1.5X) con-

version to maximize efficiency for White LED appli-

cations. The device can be used to produce current

levels up to 20mA in each of its six outputs to drive

LED's from a 2.7V to 5.5V input. Outputs may be

operated individually or paralleled for driving high-

er-current LED's. Low external parts counts (two

1µF flying capacitors and two small 1µF capacitors

at VIN, and OUT) make the AAT3134 ideally suited

for small battery-powered applications.

AnalogicTech's Simple Serial Control (S2Cwire™)

interface is used to enable, disable and set the

LED drive current in two groups of four outputs and

two outputs with multiple level independently con-

trolled brightness scales. The AAT3134 has a ther-

mal management system to protect 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. A high charge pump

switching frequency enables the use of very small

external capacitors. A low current shutdown feature

disconnects the load from VIN and reduces quies-

cent current to less than 1µA. The AAT3134 is

available in a 16-pin quad QFN package.

Features

ChargePump™

• VIN Range: 2.7 - 5.5 Volts

• < 1.0µA of Shutdown

• 1 MHz Switching Frequency

• Fully Independent Display Lighting

• Dual Mode 1x and 1.5x Charge Pump for

Maximum Efficiency

• Drives Low-VF & High-VF Type LED's

• Up to Six 20mA Outputs

• Multi Position Brightness Scale with Digital

Control

• Low Noise Constant Frequency Operation

• Small Application Circuit

• Regulated Output Current

• Automatic Soft-Start

• No Inductors

• 16-pin QFN package

• -40 to +85°C Temperature range

Applications

• White LED Backlighting

• White Photo-Flash for DSC's

• Color (RGB) Lighting

• Programmable Current Source

Typical Application

VBATTERY

VIN

C1+

CIN

COUT

1µF

1µF

EN/SET

VOUT

C1-

C2+

AAT3134

C2-

D1

D2

D3

D4

D5

EN/SET D6

GND

C1

1µF

C2

1µF

D4

D3

D2

D1

D6

D5

Sub

Display

Main

Display

3134.2004.04.1.0

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