LM36922

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM36922 Highly Efficient Dual-String White LED Driver LM36922 SNVSA29 – MAY 2015 1 Features 1 1% Matched Current Sinks Across (Process, Voltage, Temp) 3% Current Sink Accuracy Across (Process, Voltage, Temp) 11-Bit Dimming Resolution Up to 91.6% Solution Efficiency Drives from One to Two Parallel LED Strings at up to 28 V 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, 21 V, 25 V, 29 V) Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA) Thermal Shutdown Protection 2 Applications Power Source for Smart Phone and Tablet Backlighting 3 Description The LM36922 is an ultra-compact, highly efficient, two string white-LED driver designed for LCD display backlighting. The device can power up to 8 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 thus allowing for a wide range of PWM frequencies and noise-free operation. The device operates over the 2.5-V to 5.5-V input voltage range and -40°C to 85...