Maxim Integrated DS3984T

Description
The DS3984 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. It supports configurations of 1 to 4 lamps and can be cascaded to support more than 4 lamps.

Features
High-density CCFL controller for LCD TV and PC monitor backlights
Can be easily cascaded to support more than 4 lamps
Minimal external components
Analog brightness control
Per-channel lamp control ensures equal brightness among lamps and maximizes lamp life
Gate driver phasing minimizes DC supply current surges
Per-channel lamp fault monitoring for lamp open, lamp overcurrent, failure to strike, and overvoltage conditions
Accurate (±5%) independent on-board oscillators for lamp frequency (40kHz to 80kHz) and DPWM burst dimming frequency (22.5Hz to 440Hz)
Can be synchronized to external sources for the lamp and DPWM frequencies
<10% to 100% dimming range
Programmable soft-start minimizes audible transformer noise
I²C-compatible serial port and on-board nonvolatile (NV) memory allow device customization
8-byte NV user memory for storage of serial numbers and date codes
4.5V to 5.5V single-supply operation
-40°C to 85°C temperature range
32-lead TQFP (7mm x 7mm) package or 28-pin SO (300 mils) package

Applications
LCD televisions
LCD PC monitors