ADM8843

PRODUCTION

Four White LED Backlight Driver

Data Sheet (Rev. E) Product Selection Table
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Overview

  • Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply
  • 1×/1.5×/2× fractional charge pump to maximize power efficiency
  • 0.3% typical LED current matching
  • Up to 88% power efficiency over Li-Ion range
  • Powers main and sub display LEDs with individual shutdown
  • Package footprint only 9 mm2 (3 mm × 3 mm)
  • Package height only 0.75 mm
  • Low power shutdown mode
  • Shutdown function
  • Soft start limiting in-rush current

The ADM8843 uses charge pump technology to provide the power to drive up to four LEDs. The LEDs are used for backlighting a color LCD display that has regulated constant current for uniform brightness intensity. The main display can use up to three LEDs, and the sub display uses one LED. The CTRL1 and CTRL2 digital input control pins control the shutdown operation and the brightness of the main and sub displays.

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%.

Applications

  • Cellular phones with main and sub displays
  • White LED backlighting
  • Camera flash/strobes and movie light applications
  • Micro TFT color displays
  • DSC
  • PDAs
ADM8843
Four White LED Backlight Driver
ADM8843-fbl ADM8843 Pin Configuration ADM8843 Typical Application Diagram
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Documentation

Data Sheet 1

Evaluation Design File 1

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Evaluation Kits

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Features and Benefits

  • ADM8843 drives 4 white LEDs from a 2.6V to 5.5V (li-ion) input supply
  • 1x/1.5x/2x Fractional Charge Pump to maximize power efficiency
  • 0.3% Typ LED Current Matching
  • Power Sub and main Display LEDs
  • Low Power Shutdown Mode
  • Package footprint only 9mm2 (3mm x 3mm)
  • Package height only 0.9mm
  • Shutdown Function
  • Soft-start limiting inrush current

Product Details

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).
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