Datasheet > AAT3134

AAT3134

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
13页	273K
描述
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

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AAT3134 数据手册

AAT3134

High Efficiency 1X/1.5X Fractional

Charge Pump for White LED Applications

™

ChargePump

General Description

Features

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

LEDs from a 2.7V to 5.5V input. Outputs may be

operated individually or paralleled for driving high-

er-current LEDs. A low external parts count (two

1µF flying capacitors and two small 1µF capacitors

at V_INand OUT) make the AAT3134 ideally suited

for small battery-powered applications.

•

V_INRange: 2.7V to 5.5V

<1.0µA of Shutdown

1MHz Switching Frequency

Fully Independent Display Lighting

Dual Mode 1X and 1.5X Charge Pump for

Maximum Efficiency

Drives Low-V_Fand High-V_FType LEDs

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 QFN44 Package

-40°C to +85°C Temperature Range

•

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 V_INand reduces quies-

cent current to less than 1µA. The AAT3134 is

available in a Pb-free 16-pin QFN44 package and is

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

Applications

•

Color (RGB) Lighting

Programmable Current Source

White LED Backlighting

White LED Photo Flash for Digital Still Cameras

Typical Application

VIN

C1+

1µF

C1-

VOUT

C2+

C_IN

C_OUT

V_BATTERY

AAT3134

1µF

C2-

EN/SET

GND

Main

Display

Sub

Display

3134.2005.12.1.1

12 3 4 5 6 7...13

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