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General Description

The AAT3152 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 AAT3152 is capable of driving four-channel LEDs from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. Low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes this part ideally suited for small battery-powered applications.

Features

? VIN Range: 2.7V to 5.5V

? Fully Programmable Current with Single Wire

? Eight-Step Current: 20mA to 50μA

? Individual Main-Sub Group Control

? Low IQ (80μA) at Light Load

? Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage

? Drives 1-4 Channels of LEDs

? No Inductors, Low Noise Operation

? 1MHz Constant Switching Frequency

? Small Application Circuit

? Built-In Thermal Protection

? Built-In Auto-Disable for Short-Circuit

? Automatic Soft-Start

? IQ <1μA in Shutdown

? Thermal-Enhanced 3x3mm12-Pin DFN Package

Applications

? Color (RGB) Lighting

? Programmable Current Sinks

? White LED Backlighting

? White Photo Flash for DSCs