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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