Datasheet > AAT3142_07

AAT3142_07

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
16页	477K
描述
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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AAT3142_07 数据手册

AAT3142

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

for White LED Applications

™

ChargePump

General Description

Features

The AAT3142 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 device produces cur-

rent levels up to 30mA on each of its three 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 high-

er-current LEDs. A low external parts count (two

1µF flying capacitors and two small 1µF capacitors

at V_INand CP) make the AAT3142 ideally 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 Three 30mA Outputs

32-Position Logarithmic Scale with Digital

Control

•

Low Noise Constant Frequency Operation

1MHz Switching Frequency

Small Application Circuit

Regulated Output Current

Automatic Soft Start

No Inductors

I_Q< 1µA in Shutdown

AnalogicTech's Simple Serial Control™ (S Cwire™)

12-Pin TSOPJW Package

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

LED drive current with a 32-level logarithmic scale

LED brightness control. The AAT3142 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 switch-

ing frequency enables the use of very small external

capacitors. In shutdown mode, the device discon-

nects the load from V_INand reduces quiescent cur-

rent to less than 1µA. The AAT3142 is available in

the very small, Pb-free 12-pin TSOPJW package.

Applications

•

Color (RGB) Lighting

Programmable Current Sources

White LED Backlighting

White Photo Flash for Digital Still Cameras

Typical Application

VIN

C1+

1μF

C1-

C2+

C_IN

C_CP

V_BATTERY

AAT3142

1μF

C2-

EN/SET

GND

3142.2007.03.1.2

12 3 4 5 6 7...16

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