LM36922 Texas instruments

LM36922

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LM36922

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Описание

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.

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

Number of channels	2
Vin (min) (V)	2.5
Vin (max) (V)	5.5
Vout (min) (V)	0
Vout (max) (V)	29.5
Type	Inductive
Switching frequency (max) (kHz)	1050
Duty cycle (max) (%)	94
LED current per channel (mA)	25
Peak efficiency (%)	92
Topology	Boost
Features	Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, OVP, PWM control, Thermal shutdown
Operating temperature range (°C)	-40 to 85
Rating	Catalog