Datasheet > AAT3157

AAT3157

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
11页	302K
描述
High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

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AAT3157 数据手册

AAT3157

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

For White LED Applications

™

ChargePump

General Description

Features

The AAT3157 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 AAT3157 is capable of

driving up to three channels of LEDs at 20mA per

channel from a 2.7V to 5.5V input. The current

sinks may be operated individually or in parallel for

driving higher current LEDs. A low external parts

count (two 1μF flying capacitors and two small 1μF

capacitors at IN and OUTCP) make this part ideal-

ly suited for small, battery-powered applications.

•

V_INRange: 2.7V to 5.5V

Fully Programmable Current with Single Wire

— 16 Current Levels

— Four Low Current Settings Down to 50µA

Low I_Q(50µA) for Low Current Mode

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

Maximum Efficiency and V_FCoverage

Drives up to Three Channels of LEDs

No Inductors, Low Noise Operation

1MHz Constant Switching Frequency

Small Application Circuit

Built-In Thermal Protection

Automatic Soft Start

I_Q<1µA in Shutdown

2.85x3.0mm TSOPJW-12 Package

•

AnalogicTech's S²Cwire^™(Simple Serial Control^™)

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

current for each LED with 16 settings down to 50μA.

The low-current mode supply current can be as low

as 50μA to save power.

Each output of the AAT3157 is equipped with built-

in protection for output short-circuit and auto-dis-

able for load short-circuit conditions. Built-in soft-

start circuitry prevents excessive inrush current

during start-up. A low-current shutdown feature dis-

connects the load from the input and reduces qui-

escent current to less than 1μA.

Applications

•

Color (RGB) Lighting

Programmable Current Sinks

White LED Backlighting

White Photo Flash for Digital Still Cameras

The AAT3157 is available in a Pb-free, space-sav-

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

Typical Application

C1+

C2+

1µF

C2-

C1-

OUTCP

2.7V to 5.5V

C_OUT

1µF

C_IN

1µF

AAT3157

GND

EN/SET

3157.2006.05.1.2

12 3 4 5 6 7...11

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