LM36923H Triple-String White LED Driver Texas Instruments LM36923H Triple-String White LED Driver is an ultra-compact, highly efficient, three-string white-LED driver, designed for LCD display backlighting. The device can power up to 12 series LEDs at up to 25mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation. The LED current is adjusted via an I2C interface or through a logic-level PWM input. The PWM duty cycle of the Texas Instruments LM36923H is internally sensed and mapped to an 11-bit current. This feature allows for a wide range of PWM frequencies with noise-free operation from 50µA to 25mA. Other features include an auto-frequency mode, which can automatically change the frequency based on load current to optimize efficiency.