Analog Devices, Inc. (ADI), a global leader in high-performance signal processing applications, recently introduced the ADP8870 white LED charge pump backlight driver, which reduces the power consumption of battery-powered handheld devices by up to 45%. Does not affect the display quality.
The ADP8870 includes programmable backlight LED charge pump drivers, phototransistor inputs for automatic control of LED brightness, and three key functions for managing the input current ratio of the PWM input. Therefore, it can automatically change the current intensity according to the ambient illumination intensity and the white light component of the displayed image, thereby greatly reducing power consumption.
The ADP8870 automates this function, eliminating the need for a processor to monitor the phototransistors, further reducing power requirements and simplifying portable backlight designs.
Dan Swan, product line director of the company's power management products division, said, "In the common operations of web browsing and e-mail processing, LED backlights consume about 75% of the power consumption of portable electronics. The ADP8870 uses ambient light detection and content. Adapt to backlight control technology to optimize the illumination of the main/secondary display and QWERTY keyboard to extend battery life."
It is reported that the ADP8870 can control up to 7 LEDs. In addition to being used for backlight control, these LEDs can also be used independently for keyboard illumination, indicator lighting or fun lighting. Also, the grading of each LED is programmable to allow designers to customize fade, fade, fade, and turn off times.
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