Four White LED Backlight Driver
To maximize power efficiency, the charge pump can operate in 1×, 1.5×, or 2× mode. The charge pump automatically switches among 1×/1.5×/2× modes, based on the input voltage, to maintain sufficient drive for the LED anodes at the highest power efficiency.
Improved brightness matching of the LEDs is achieved by a feedback pin that senses individual LED current with a typical matching accuracy of 0.3%.
- Cellular phones with main and sub displays
- White LED backlighting
- Camera flash/strobes and movie light applications
- Micro TFT color displays
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The ADM8843 provides two digital input control pins, CTRL1 and CTRL2, which control the operation and the brightness of the LEDs. The ADM8843 is configured with a sub and main display, the main display refers to 3 of the 6 LEDs (FB1 – FB3) and the sub display refers to the remaining LED (FB54).
The ADM8843 provides the option to control the brightness of the LEDs with a digital PWM signal. The duty cycle of the PWM signal determines the brightness of the backlight LEDs. Brightness control of the LEDs can also be controlled by a DC voltage. The ADM8843 has soft-start circuitry to limit inrush current flow at power up.
The ADM8843 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 16-lead LFCSP (Lead Frame Chip Scale Package).
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.
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