Allegro MicroSystems A8511 Multi-output WLED/RGB drivers

     The Allegro MicroSystems A8511 Multi-output WLED/RGB Driver is a fully integrated high brightness (HB) LED driver solution for medium sized backlit displays. The flexible A8511 drive does not require an external power device to complete the backlight design standard.

     The A8511 integrates FETs for boost converters and four 150mA current receivers, providing a complete integrated solution at HB LED current levels. When connected together, the device's LED channel allows a reception capacity of up to 600mA. The A8511 operates on a single power supply of 6.8V to 21V and can withstand voltages up to 40V. The operating frequency can be set to 2MHz to avoid interference with AM radio bands. The integrated boost DMOS switch is rated at 40V and 3.6A. PWM dimming allows the LED current to be controlled in a 1000:1 ratio. Additional 4:1 dimming can be achieved using the DIM pin.

     The Allegro MicroSystems A8511 Multi-output WLED/RGB driver prevents short circuits in the output connector with an integrated output disconnect switch. Optional external thermistors limit LED current based on panel temperature.
The A8511 drive is mounted in a surface-mounted, 28-pin TSSOP package (suffix LP) with an exposed heat pad for enhanced heat dissipation. The unit is lead-free (Pb), 100% matte tin lead frame plating.