DESCRIPTION

· The LP8545 is a white LED driver with an integrated high-voltage DC/DC boost converter, designed for notebook LCD display backlighting.
· It features six adjustable current sinks controlled via PWM input or I2C-compatible serial interface.
· The boost converter employs adaptive output voltage control to minimize power consumption by adjusting to the lowest sufficient voltage level.
· LED outputs offer 8-bit current resolution and up to 13-bit PWM resolution with dithering for smooth brightness control.
· Proprietary Phase Shift PWM control reduces peak current, allowing for smaller boost capacitors and eliminating audible noise.
· Internal EEPROM stores configuration data, minimizing external components and solution size.
· Safety features include LED fault detection, low input voltage, over-temperature, and over-current detection with shutdown capabilities.
· Available in a compact WQFN 24-pin package measuring 4x4x0.8mm.

FEATURES

· High-Voltage DC/DC Boost Converter with integrated FET and four switching frequency options: 156/312/625/1250 kHz.
· Configurable for use with an external FET for applications requiring higher output voltage.
· Supports input voltage range of 2.7V to 22V, compatible with 1x to 5x cell Li-Ion batteries.
· Programmable PWM resolution from 8 to 13 true bits, with additional 1-3 bit dithering for brightness changes.
· I2C and PWM brightness control with optional synchronization to display VSYNC signal.
· Six LED outputs with fault detection for short/open circuits.
· Low input voltage, over-temperature, over-current detection, and shutdown features.
· Thermal de-rating function to prevent overheating by reducing backlight brightness.

APPLICATIONS

· Notebook and netbook LCD display LED backlighting.
· General LED lighting applications.