Lighting drivers power up to 20 series-connected LEDs
6 September 2006Power Electronics / Power Management
Access Control & Identity Management
National Semiconductor recently introduced two new, highly-integrated lighting management units (LMUs) that include a high-voltage boost converter and programmable constant-current driver to control up to 20 series-connected LEDs in display backlights, and keypad, RGB and camera flash LEDs. The LP3958 and LP5526 LMUs feature tiny micro SMD packages.
The devices can drive from two to five strings of four series-connected LEDs, depending on the lighting application. They are optimised for use in single- or dual-display phones, as well as large display PDA phones. Each features three general-purpose input/outputs (GPIOs) to trigger lighting functions such as flash or to control additional device-enable signals.
The LP3958 features 70 mA of output current and the LP5526 features 150 mA of output current. Both devices include an I²C interface. The LP3958 LMU can drive up to eight white LEDs grouped as four series-connected LEDs per string, with typically one string per display. The LP5526 can drive multidie serial-flash LEDs in camera Flash (up to 3 W of power) and torch applications.
For more information contact Lambert Colyn, Arrow Altech Distribution, +27 (0)11 923 9600, lcolyn@arrow.altech.co.za
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