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WLED drivers extend mobile battery life

Posted: 18 Feb 2009     Print Version  Bookmark and Share

Keywords:WLED drivers  PWM interface  handset talk time  battery power 

Micrel Inc. has announced a new family of extremely efficient White LED (WLED) drivers that prolongs mobile handset talk time by up to 32 per cent.

The MIC284x solutions target a wide variety of mobile devices including portable display backlights, keypad backlighting and camera flash in mobile handsets, smart phones, portable media/MP3 players, portable navigation devices (GPS) and other portable devices—all applications where saving battery power is critical.

"Typical portable display and keypad backlighting boost circuits waste large amounts of battery power generating a higher voltage. Micrel's new WLED driver architecture completely eliminates this loss and removes up to five external components, saving up to 62 per cent footprint," said Andy Khayat, director of Micrel's portable product group. "The MIC284x driver product family represents a true paradigm shift away from traditional WLED circuits in that it provides the highest efficiency, smallest board area, and most elegant solution in today's market."

The MIC284x series WLED drivers are designed to drive two to six WLEDs. Each IC features a unique linear charging scheme that saves the normally used switching components. This saves up to 62 per cent board space.

The MIC284x family ensures uniform display illumination through a Dynamic Average Matching (DAM) technique which provides better than 1.5 per cent current matching and accuracy. WLED brightness is controlled through an Ultra Fast PWM or Single Wire Digital 32-step interface. The Ultra Fast PWM interface is one of the most versatile control interfaces on the market allowing control of a wide range of frequencies from 200Hz to 500kHz and dimming down to less than 1 per cent duty cycle.

The MIC284x series is available in the 2mm x 2mm 10-pin Thin MLF leadless package with a junction temperature range of –40°C to 125°C. The MIC284x is currently available in volume quantities with pricing starting at Rs.16.41 ($0.33) for 1K quantities.





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