LP8545

LP8545 www.ti.com SNVS635D – APRIL 2010 – REVISED DECEMBER 2013 High-Efficiency LED Backlight Driver for Notebooks Check for Samples: LP8545 FEATURES 1 2 High-Voltage DC/DC Boost Converter with Integrated FET with Four Switching Frequency Options: 156/312/625/1250 kHz Configurable for Use with External FET for Applications Needing Higher Output Voltage 2.7V – 22V 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 Changes I2C and PWM Brightness Control 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, Over- Current Detection and Shutdown Minimum Number of External Components WQFN 24-Pin Package, 4 x 4 x 0.8 mm APPLICATIONS Notebook and Netbook LCD Display LED Backlight LED Lighting DESCRIPTION The LP8545 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 1-3 bit dithering...