Datasheet > AAT3131

AAT3131

更新时间： 2022-11-29 03:52:45

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
14页	329K
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. Low external parts counts (two 1µF flying

capacitors and two small 1µF capacitors at V_IN,

and OUT) make the AAT3131 ideally suited for

small battery-powered applications.

•

V_INRange: 2.7 - 5.5 Volts

< 1.0µA of Shutdown current

1.0 MHz Switching Frequency

White LED Backlighting

Fully Independent Display Lighting

Dual Mode 1x and 1.5x Charge Pump for

Maximum Efficiency

•

Drives Low-V_F& High-V_Ff Type LED's

Up to three 20mA Outputs

Single 30 mA Output

Multi Position Logarithmic Scale with Digital

Control

•

Low Noise Constant Frequency Operation

Regulated Output Current

Automatic Soft-Start

AnalogicTech™'s Simple Serial Control™

(S Cwire™) interface is used to enable, disable

No Inductors

and set the LED drive current in two groups: the

three 20mA outputs and the single 30mA output

with multiple level logarithmic scales. The AAT3131

has a thermal 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_IN

and reduces quiescent current to less than 1µA.

The AAT3131 is available in very small 12 pin

TSOPJW12 package.

-40 to +85°C Temperature Range

12 pin TSOPJW-12 package

Applications

•

White LED Backlighting

White Photo-Flash for DSC's

Color (RGB) Lighting

Programmable Current Source

Typical Application

C1+

1µF

C1-

V_OUT

C2+

C_IN

C_OUT

V_BATTERY

AAT3131

1µF

C2-

EN/SET

GND

3131.2004.08.1.1

12 3 4 5 6 7...14

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