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AAT3141ITP-T1

High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Advanced Analogic Technologies 

AAT3141

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

for White LED Applications

General Description

The AAT3141 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 4 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 VIN, and CP) make the AAT3141 ideally suited

for small battery-powered applications.

Analogic Tech™'s Advanced Simple Serial Control™

(AS2Cwire™) digital input is used to enable, disable

and set the LED drive current with a 32 level loga-

rithmic scale LED brightness control. The AAT3141

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 exces-

sive inrush current during start-up. A high charge

pump switching frequency enables the use of very

small external capacitors. In shutdown mode, the

device disconnects the load from VIN and reduces

quiescent current to less than 1µA. The AAT3141 is

available in the very small 12 pin TSOPJW package.

Features

ChargePump™

• Tri Mode 1x, 1.5x, and 2x Charge Pump for

Maximum Efficiency and VF coverage

• Drives Low-VF & High-VF Type LEDs

• Up to 4, 30mA Outputs

• AS2Cwire Independent 3+1 output addressing

• 32 Position Logarithmic Scale with Digital

Control

• Low Noise Constant Frequency Operation

• 1MHz Switching Frequency

• Small Application Circuit

• Regulated Output Current

• Automatic Soft-Start

• VIN Range: 2.7V to 5.5V

• No Inductors

• Iq < 1µA in Shutdown

• 12 pin TSOPJW package

Applications

• White LED Backlighting

• White Photo-Flash for DSCs

• Color (RGB) Lighting

• Programmable Current Sources

Typical Application

VBATTERY

CIN

CCP

1µF

1µF

EN/SET

VIN

C1+

CP

C1-

C2+

AAT3141

C2-

D1

D2

D3

D4

EN/SET

GND

C1

1µF

C2

1µF

D4

D3

D2

D1

3141.2004.07.0.91

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