LP8550

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LP8550 SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014 LP8550 High-Efficiency LED Backlight Driver for Notebooks 1 Features 1 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 to 5x Cell Li-Ion Batteries Programmable PWM Resolution – 8 to 13 True Bits (Steady State) – Additional 1 to 3 Bits Using Dithering During Brightness Changes I2C 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 Six LED Outputs with LED Fault (Short/Open) Detection Low Input Voltage, Overtemperature, Overcurrent Detection, and Shutdown Minimum Number of External Components 2 Applications Notebook and Netbook LCD Display LED Backlight LED Lighting 3 Description 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 I2Ccompatible 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- to 3-bit ...