10 x LP8550 High-Efficiency LED Backlight Driver for Notebooks

(No reviews yet) Write a Review
Calculated at Checkout
  • 10 x LP8550 High-Efficiency LED Backlight Driver for Notebooks
  • 10 x LP8550 High-Efficiency LED Backlight Driver for Notebooks



10 x NEW LP8550 - TI
High-Efficiency LED Backlight Driver for Notebooks 


The LP8550 is a white LED driver with integrated boost converter. It has six adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface. The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1-3 bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency. Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.

The LP8550 has safety features which make it possible to detect LED outputs with open or short fault. As well low input voltage and boost overcurrent conditions are monitored and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached. Features

High-Voltage DC/DC Boost Converter with Integrated FET
with Four Switching Frequency Options: 156/312/625/1250 kHz
2.7-V to 22-V Input Voltage Range to Support 1x…5x
cell Li-Ion Batteries
Programmable PWM Resolution
8 to 13 True Bit (Steady State)
Additional 1 to 3 Bits Using Dithering During Brightness
I2C-Compatible and PWM Brightness Control
Automatic PWM & Current Dimming for Improved Efficiency
PWM Output Frequency and LED Current set through Resistors
Optional Synchronization to Display VSYNC Signal
6 LED Outputs with LED Fault (Short/Open) Detection
Low Input Voltage, Over-temperature, Overcurrent Detection,
and Shutdown
Minimum Number of External Componen
View AllClose

Additional Information

View AllClose