Datasheet > AAT3194

AAT3194

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
14页	307K
描述
High Efficiency 1.5X Fractional Charge Pump For White LED Applications

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AAT3194 数据手册

AAT3194

High Efficiency 1.5X Fractional Charge

Pump For White LED Applications

™

ChargePump

General Description

Features

The AAT3194 is a low noise, constant frequency

charge pump DC/DC converters that use fractional

(1.5X) conversion to increase efficiency in white

LED applications. The devices can be used to pro-

duce current levels up to 20mA for each output

from a 2.7V to 5.5V input. A low external parts

count (two 1µF flying capacitors and two small

bypass capacitors at IN and OUT) makes these

devices ideally suited for small, battery-powered

applications.

•

V_INRange: 2.7V to 5.5V

20mA Full-Scale Current

Simple Serial Control (S²Cwire) Interface

— 32-Position Logarithmic Scale with Digital

Control

•

Low Noise Constant Frequency Operation

33% Less Input Current Than Doubler

Charge Pump

High Accuracy Brightness Matching

Small Application Circuit

Regulated Output Current

Automatic Soft Start

No Inductors

600kHz Switching Frequency

I_Q<1µA in Shutdown

Temperature Range: -40°C to 85°C

12-Pin TSOPJW Package

•

AnalogicTech’s Simple Serial Control™ (S²Cwire™)

interface is used to enable, disable, and set the

LED drive current for 32-level logarithmic scale LED

brightness control. The AAT3194 has a thermal

management system for protection in the event of a

short-circuit condition on any of the output pins.

Built-in soft-start circuitry prevents excessive inrush

current during start-up. A high switching frequency

enables the use of small external capacitors. A low-

current shutdown feature disconnects the load from

V_INand reduces quiescent current to less than 1µA.

The AAT3194 is available in a Pb-free 12-pin

TSOPJW package.

Applications

•

Programmable Current Source

White LED Backlighting

Typical Application

C1+

1µF

C1-

C2+

OUT

C_IN

C_OUT

1µF

V_BATTERY

AAT3194

1µF

C2-

EN/SET

GND

3194.2006.09.1.0

12 3 4 5 6 7...14

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