LM36922H Texas instruments

LM36922H

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LM36922H

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Описание

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 thus allowing for a wide range of PWM frequencies with noise-free operation from 50 µA to 25 mA. Other features include an auto-frequency mode, which can automatically change the frequency based on load current in order to optimize efficiency. The device operates over the 2.5-V to 5.5-V input voltage range and a –40°C to +85°C temperature range. For all available packages, see the orderable addendum at the end of the data sheet.

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

Number of channels	2
Vin (min) (V)	2.5
Vin (max) (V)	5.5
Vout (min) (V)	37
Vout (max) (V)	40
Type	Inductive
Switching frequency (max) (kHz)	1050
Duty cycle (max) (%)	92
LED current per channel (mA)	30
Peak efficiency (%)	92
Topology	Boost, Current Sink, Multi-Channel
Features	Adjustable Switch Frequency, CABC, Direct PWM Dimming, I2C control, OVP, Thermal shutdown
Operating temperature range (°C)	-40 to 85
Rating	Catalog