General Description
The LD7889A 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 LD7889A 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 LD7889A 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.

FEATUREs
● Input Voltage range: 4.5V to 36V
● Drives up to 4 strings in parallel, up to 240mA per
   string
● Time-shift PWM dimming control
● External PWM dimming control
● LED short circuit protection
● LED open string protection
● MOSFET over-current protection
● Over-temperature protection
● Status output

APPLICATIONs
● UMPC and Notebook Computer Backlight
● Backlight for GPS, Portable DVD
● LED Backlight for LCD Monitor/ TV