AnalogicTech introduces a high efficiency charge pump for white LED flash applications

Theale, UK — Advanced Analogic Technologies has introduced the AAT3175 , a low noise, high frequency, current mode charge pump for white LED flash applications. It is the company’s first dedicated current mode fractional/doubler charge pump for camera flash applications, and is capable of driving up to three flash LEDs at 300mA total current with current sharing from a 2.7V to 5.5V source. The tri-mode device maximizes efficiency by combining a load switch (1X), fractional (1.5X), and doubling (2X) capability with an internal sensing circuit to match output to LED requirements. The new charge pump is also completely programmable via AnalogicTech’s innovative S2Cwire (Simple Serial Control) digital interface. The single wire interconnect is used to enable, disable, and set current for all LEDs across 16 current levels, capable of controlling movie-mode lighting or camera flash. With four current sink channels (100/50/50/100mA capability), the AAT3175 can accommodate single, 2-in-1, or 3-in-1 LEDs with high-precision current matching. Operating at a 1 MHz switching frequency, the AAT3175 requires just two 1 µF flying capacitors and two small 1 µF capacitors at VIN and VOUT. The device also features integrated protection for VOUT short-circuit conditions and auto-disable for load short-circuit protection on any individual channel. Soft-start circuitry prevents excessive inrush current during start-up. AnalogicTech , Theale, UK.

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