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LP8550
SNVS657E – SEPTEMBER 20...
Product Folder
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Technical Documents
Tools & Software
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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 ...