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°C temperature range.