Datasheet > AAT3131

AAT3131

更新时间： 2022-12-26 18:46:38

品牌	Logo	应用领域
AAT		泵
页数	文件大小	规格书
14页	275K
描述
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

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AAT3131 数据手册

AAT3131

High Efficiency 1X/1.5X Fractional

Charge Pump for White LED Applications

™

ChargePump

General Description

Features

The AAT3131 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 cur-

rent levels up to 20mA in three of its outputs and

30mA in one of its outputs to drive LEDs from a

2.7V to 5.5V input. Outputs may be operated indi-

vidually or paralleled for driving higher-current

LEDs. A low external parts count (two 1µF flying

capacitors and two small 1µF capacitors at V_INand

OUT) makes the AAT3131 ideally suited for small

battery-powered applications.

•

V_INRange: 2.7V to 5.5V

<1.0µA of Shutdown Current

1MHz Switching Frequency

White LED Backlighting

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 Three 20mA Outputs

Single 30mA Output

Multi-Position Logarithmic Scale with Digital

Control

Low Noise Constant Frequency Operation

Regulated Output Current

Automatic Soft Start

No Inductors

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 in two groups: the three 20mA outputs

and the single 30mA output with multiple level loga-

rithmic scales. The AAT3131 has a thermal man-

agement 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 fre-

quency enables the use of very small external

capacitors. A low-current shutdown feature discon-

nects the load from V_INand reduces quiescent cur-

rent to less than 1µA. The AAT3131 is available in

a Pb-free 12-pin TSOPJW12 package and is rated

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

Applications

•

Color (RGB) Lighting

Programmable Current Source

White LED Backlighting

White Photo Flash for Digital Still Cameras

Typical Application

VIN

C1+

1µF

C1-

VOUT

C2+

C_IN

C_OUT

V_BATTERY

AAT3131

1µF

C2-

EN/SET

GND

3131.2005.12.1.2

12 3 4 5 6 7...14

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