LM36922 Series

High efficiency, dual-String, 30-V Synchronous white LED driver

Catalog

High efficiency, dual-String, 30-V Synchronous white LED driver

Part	Mounting Type	Applications	Package / Case	Frequency	Current - Output / Channel [custom]	Topology	Type	Voltage - Supply (Max)	Voltage - Supply (Min) [Min]	Supplier Device Package	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output	Internal Switch(s)	Dimming
Texas Instruments LM36922YFFR	Surface Mount	Backlight	12-UFBGA DSBGA	1 MHz 500 kHz	25 mA	Step-Up (Boost)	DC DC Regulator	5.5 V	2.5 V	12-DSBGA	2	85 °C	-40 °C	38 V		I2C PWM

Catalog

High efficiency, dual-String, 30-V Synchronous white LED driver

Key Features

• 1% Matched Current Sinks Across (Process,Voltage, Temp)3% Current Sink Accuracy Across (Process,Voltage, Temp)11-Bit Dimming ResolutionUp to 91.6% Solution EfficiencyDrives from One to Two Parallel LED Strings at upto 28 VPWM Dimming InputI2C ProgrammableSelectable 500-kHz and 1-MHz SwitchingFrequency with Optional –12% shiftAuto Switch Frequency Mode (250 kHz, 500 kHz,1 MHz)Four Configurable Overvoltage ProtectionThresholds (17 V, 21 V, 25 V, 29 V)Four Configurable Overcurrent ProtectionThresholds (750 mA, 1000 mA, 1250 mA, 1500mA)Thermal Shutdown Protection1% Matched Current Sinks Across (Process,Voltage, Temp)3% Current Sink Accuracy Across (Process,Voltage, Temp)11-Bit Dimming ResolutionUp to 91.6% Solution EfficiencyDrives from One to Two Parallel LED Strings at upto 28 VPWM Dimming InputI2C ProgrammableSelectable 500-kHz and 1-MHz SwitchingFrequency with Optional –12% shiftAuto Switch Frequency Mode (250 kHz, 500 kHz,1 MHz)Four Configurable Overvoltage ProtectionThresholds (17 V, 21 V, 25 V, 29 V)Four Configurable Overcurrent ProtectionThresholds (750 mA, 1000 mA, 1250 mA, 1500mA)Thermal Shutdown Protection

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. 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.