MAX753
CCFL Backlight and LCD Negative Contrast Controller
Digital or Potentiometer Control of LCD Contrast and CCFL Brightness
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Overview
Features and Benefits
- 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
Product Details
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.
Both the backplane bias and the CCFL supply can be shut down independently. When both sections are shut down, supply current drops to 25µA. 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. The MAX753 provides a negative LCD bias voltage; the MAX754 provides a positive LCD bias voltage.
Applications
- Notebook Computers
- Palmtop Computers
- PDAs and Other Handheld Devices
- Pen-Based Data Systems
- Portable Data-Collection Terminals
Product Categories
Product Lifecycle
Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Documentation & Resources
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX753CSE+ | Material Declaration | Reliability Data | Small-Outline IC, Narrow (0.15in) | |
| MAX753CSE+T | Material Declaration | Reliability Data | Small-Outline IC, Narrow (0.15in) | |
| Wafer Fabrication Data |
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