The MIC284x is useful in 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, 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% 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 family ensures uniform display illumination through a Dynamic Average Matching (DAM) technique which provides better than 1.5% current matching and accuracy. WLED brightness is controlled through an Ultra Fast PWM(TM) 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% duty cycle. The MIC284x series is available in the 2mm x 2mm 10-pin Thin MLF leadless package with a junction temperature range of -40degC to +125degC.
