MAXIM MAX753CSE

The MAX753/MAX754 drive cold-cathode fluorescent lamps (CCFLs) and provide the LCD backplane bias (contrast) power for color or monochrome LCD panels. These ICs are designed specifically for backlit notebook-computer applications.

• Drives Backplane and Backlight
• 4V to 30V Battery Voltage Range
• Low 500μA Supply Current
• Digital or Potentiometer Control of CCFL Brightness and LCD Bias Voltage
• Negative LCD Contrast (MAX753)
• Positive LCD Contrast (MAX754)
• Independent Shutdown of Backlight and Backplane Sections
• 25µA Shutdown Supply Current
• Both the backplane bias and the CCFL supply can be shut down independently.
• The LCD contrast and CCFL brightness can be adjusted by clocking separate digital inputs or using external potentiometers.
• LCD contrast and backlight brightness settings are preserved in their respective counters while in shutdown.
• On power-up, the LCD contrast counter and CCFL brightness counter are set to one-half scale.
• The ICs are powered from a regulated 5V supply. The magnetics are connected directly to the battery, for maximum power efficiency.
• The CCFL driver uses a Royer-type resonant architecture. It can provide from 100mW to 6W of power to one or two tubes.

• Notebook Computers
• Palmtop Computers
• Pen-Based Data Systems
• Personal Digital Assistants
• Portable Data-Collection Terminals