Austriamicrosystems Delivers Tiny 700-mA LED Driver

Oct. 8, 2008
Measuring 2 mm x 1.5 mm and less than 600 µm in height, the AS3685 700-mA charge pump-based flash LED driver consumes just 14 mm2 of board space, including four external components. Groomed for camera-flash applications in mobile

Measuring 2 mm x 1.5 mm and less than 600 µm in height, the AS3685 700-mA charge pump-based flash LED driver consumes just 14 mm2 of board space, including four external components. Groomed for camera-flash applications in mobile phones, the device employs a smart charge pump architecture that avoids large spikes at the battery terminals. To avoid excess current draw if the phone’s power amplifier becomes active while a picture is being taken, it reduces flash current to a significantly lower level within less than 1 µs. Safety features include a built-in flash LED time-out function that guarantees flash shutdown via a built-in, factory-programmable timer (typically 800 ms). The chip comes with a multi-mode, 2-pin interface incorporating off, indicator, flashlight, and flash operating modes. The AS3685B variation features a single-wire interface allowing flash current to be set to one of 18 steps depending on actual operating and environmental conditions. The AS3685 is available now in WL-CSP3x4 packaging. AUSTRIAMICROSYSTEMS USA INC., Raleigh, NC. (919) 676-5292.

Company: AUSTRIAMICROSYSTEMS USA INC.

Product URL: Click here for more information

About the Author

Staff

Articles, galleries, and recent work by members of Electronic Design's editorial staff.

Sponsored Recommendations

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!