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General Description

The AAT3194 is a low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1?F flying capacitors and two small bypass capacitors at IN and OUT) makes these devices ideally suited for small, battery-powered applications.

Features

? VIN Range: 2.7V to 5.5V

? 20mA Full-Scale Current

? Simple Serial Control (S2Cwire) Interface

? 32-Position Logarithmic Scale with Digital Control

? Low Noise Constant Frequency Operation

? 33 Less Input Current Than Doubler Charge Pump

? High Accuracy Brightness Matching

? Small Application Circuit

? Regulated Output Current

? Automatic Soft Start

? No Inductors

? 600kHz Switching Frequency

? IQ <1?A in Shutdown

? Temperature Range: -40°C to 85°C

? 12-Pin TSOPJW Package

Applications

? Programmable Current Source

? White LED Backlighting