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Product Name: Charge pump with flash timer delivers 600 mA for white LEDs
Product Description
Sunnyvale, Calif.—Advanced Analogic Technologies' AAT3170 combines a 600-mA charge pump with programmable flash timer for next-generation white-LED applications.
"As mobile and personal electronic product designers embed higher performance cameras in their next-generation products and flash current levels increase, they need flash ICs that can protect the LEDs while delivering high power output with excellent control in a small package," said Adolfo Garcia, Product Line Director. "By combining a flash timer and high flash current drive with 32-step digital current control, the AAT3170 delivers unprecedented ability to optimize LED flash performance for a wide variety of next generation designs while providing complete flash LED protection." The regulated, dual-output driver can be programmed by a single GPIO output through the company's AS2Cwire (Advanced Simple Serial Control) interface. The interface can also be programmed to provide a regulated voltage, instead of current, for additional system loads.
The AAT3170's flash timer, which is protected against overload if there's a control logic failure, is programmable using an external capacitor to set duration. This tri-mode device (1x, 1.5x, 2x modes)maximizes efficiency with an internal sensing circuit to match its output to LED requirements. The 1x and 1.5x modes allow minimum current draw from the battery during lower LED current operations, such as torch or movie modes, which run 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 AAT3170 requires just five external components: Two 1 microfarad ceramic capacitors for the charge pump flying capacitors, one 1 microfarad capacitor for CIN and one for COUT, and one additional capacitor to set the flash timer duration. The device also features a thermal management system and built-in soft-start circuitry.
Company Details
The Power Management DesignLine site is managed by Editor Paul O'Shea.
Starting out his career in the "Live Music Capital" city of Austin, Texas more than 20 years ago, Paul began with testing the Texas Instruments Business Systems, and moved on... more
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