General Description

The MAX8709B integrated backlight controller is optimized to drive cold-cathode fluorescent lamps(CCFLs) using a resonant full-bridge inverter architecture. The resonant operation maximizes striking capability and provides near-sinusoidal waveforms over the entire input range to improve CCFL lifetime. The controller operates over a wide input voltage range of 4.6V to 28V with high power-to-light efficiency. The device also includes safety features that effectively protect against many single-point fault conditions including lamp-out and short-circuit faults.

Features

♦ Synchronized to Resonant Frequency

   Longer Lamp Life

   Guaranteed Striking Capability

   High Power-to-Light Efficiency

♦ Wide Input Voltage Range (4.6V to 28V)

♦ Feed Forward for Excellent Line Rejection

♦ SMBus Dimming Control Interface

♦ 10:1 Dimming Range

♦ Guaranteed 200Hz to 220Hz DPWM Frequency

♦ Secondary Voltage Limit Reduces Transformer Stress

♦ Adjustable Lamp-Out Protection with 1s Timer

♦ Secondary Current Limit Protects Against High Voltage Short Circuits to Ground

♦ Small, 5mm x 5mm, Thin QFN Package

Applications

Notebook Computer Displays

LCD TVs

LCD Monitors

Automotive Displays

SMBus is a trademark of Intel Corp.