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Optoelectronics/Displays??

AnalogicTech rolls new charge pump IC for white LED flash apps

Posted: 01 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Advanced Analogic Technologies? AnalogicTech? AAT3172? charge pump IC? LED?

Advanced Analogic Technologies Inc. (AnalogicTech) released a high output, high efficiency current-output charge pump IC for white LED flash applications. The new AAT3172 chip supplies up to 600mA of output current across dual regulated current sinks. Each LED channel can be programmed in 32 steps with a single GPIO output through AnalogicTech's AS2Cwire (Advanced Simple Serial Control) interface.

"Cellphone designers embedding higher performance cameras in their next generation products need ICs capable of delivering high power output with excellent control in a small package," said Erik Ogren, product marketing manager for AnalogicTech. "By combining 600mA current with a 32-step digital serial control interface, the AAT3172 gives designers unprecedented ability to deliver optimal LED flash performance across a wide variety of flash applications."

The AAT3172 is a tri-mode device which 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 1x and 1.5x mode allow minimum current draw from the battery during lower LED current operations such as torch or movie light, which operates for a much longer period of time than the flash mode. Dual current sinks allow system designers to use single or dual (separate cathode) flash LED configurations.

The device's 32-step single wire interface smoothes transitions and gives designers flexible control of brightness in flash or other lighting modes. The interface can also be programmed to provide a regulated voltage instead of current, for additional system loads.

AnalogicTech added that the AAT3172 requires just four external components: two 15F ceramic capacitors for the charge pump flying capacitors, one 15F capacitor for C IN, and one for C OUT. The device also features a thermal management system and built-in soft-start circuitry.

The AAT3172 is offered in a Pb-free, thermally-enhanced, 12-pin 3-by-3mm TDFN package and is priced at $1.82 in 1,000-piece quantities.




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