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 doubling (2X) conversion to maximize efficiency for White LED applications. The device produces current 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 higher-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.

Features

• 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