LM36922H

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36922H SNVSAF2A – FEBRUARY 2016 – REVISED FEBRUARY 2016 LM36922H Highly Efficient Dual-String White LED Driver 1 Features 1 1% Matched Current Sinks Across Process, Voltage, Temperature 3% Current-Sink Accuracy Across Process, Voltage, Temperature 11-Bit Dimming Resolution Up to 90% Solution Efficiency Drives from One to Two Parallel LED Strings at up to 38 V at 25 mA per String PWM Dimming Input I2C Programmable Selectable 500-kHz and 1-MHz Switching Frequency With Optional –12% shift Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz) Four Configurable Overvoltage Protection Thresholds (17 V, 24 V, 31 V, 38 V) Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA) Thermal Shutdown Protection Externally Selectable I2C Address Options via ASEL Input 2 Applications Power Source for Smart Phone and Tablet Backlighting LCD Panels With up to 24 LEDs 3 Description The LM36922H is an ultra-compact, highly efficient, two-string white-LED driver designed for LCD display backlighting. The device can power up to 12 series LEDs at up to 25 mA 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 is internally sensed and mapped to an 11-bit current t...