LD7889

4 Channel LED Backlight Driver LD7889 10/07/2011 REV: 05 General Description The LD7889 is a 4-channel linear current controller which combines with a boost switching controller. It’s an ideal solution for driving high power LED backlights. The LD7889 can deliver high accuracy of constant current to 4 LED strings with 4 internal MOSFET. For each LED string, the current is adjustable to drive up to 240mA. The LD7889 incorporates 4 individual current regulator channels to give accurate driving current for each LED string. The string-to-string tolerance is set within ±2%. PWM input pin controls LED brightness from PWM control signals. The other features include LED short and open protection, cycle by cycle current limit, and thermal shutdown. Features z Input Voltage range: 4.5V to 36V z Drives up to 4 strings in parallel, up to 240mA per string z Time-shift PWM dimming control z External PWM dimming control z LED short circuit protection z LED open string protection z MOSFET over-c...