Datasheet > AAT3140

AAT3140

更新时间： 2022-12-11 21:03:10

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
16页	498K
描述
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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AAT3140 数据手册

AAT3140

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

for White LED Applications

™

ChargePump

General Description

Features

The AAT3140 is a low noise, constant frequency

charge pump DC/DC converter that uses a tri-mode

load switch (1X), fractional (1.5X), and doubling (2X)

conversion to maximize efficiency for white LED appli-

cations. The device produces current levels up to

30mA on each of its four current source outputs to

drive various arrangements of LEDs from a 2.7V to

5.5V input. Outputs may be operated individually or in

parallel for driving higher-current LEDs. Alow external

parts count (two 1µF flying capacitors and two small

1µF capacitors at V_INand CP) make the AAT3140 ide-

ally suited for small battery-powered applications.

•

V_INRange: 2.7V to 5.5V

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

Maximum Efficiency and V_FCoverage

Drives Low-V_Fand High-V_FType LEDs

Up to 4, 30mA Outputs

32-Position Logarithmic Scale with Digital

Control

Low Noise Constant Frequency Operation

1MHz Switching Frequency

AutoBias Technology

Small Application Circuit

Regulated Output Current

Automatic Soft Start

No Inductors

I_Q< 1µA in Shutdown

•

The AAT3140 is equipped with AnalogicTech’s unique

AutoBias™ technology which allows individual LEDs

to be powered either by charge pump or battery input,

determined internally and automatically to maximize

the power efficiency even with a large difference in

LED forward voltage.

12-Pin TSOPJW Package

AnalogicTech's Simple Serial Control™ (S²Cwire™)

digital input is used to enable, disable, and set the

LED drive current with a 32-level logarithmic scale

LED brightness control. The AAT3140 has a thermal

management system to protect the device in the event

of a short-circuit condition at an output pin. Built-in

soft-start circuitry prevents excessive inrush current

during start-up. A high charge pump switching fre-

quency enables the use of very small external capac-

itors. In shutdown mode, the device disconnects the

load from V_INand reduces quiescent current to less

than 1µA. The AAT3140 is available in the very small

12-pin TSOPJW package.

Applications

•

Color (RGB) Lighting

Programmable Current Sources

White LED Backlighting

White Photo Flash for DSCs

Typical Application

VIN

C1+

1µF

C1-

C2+

C_IN

C_CP

V_BATTERY

AAT3140

1µF

C2-

EN/SET

GND

3140.2005.03.1.1

12 3 4 5 6 7...16

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