LM36922YFFR.A中文资料德州仪器数据手册PDF规格书

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.