WLED CHARGE-PUMP BACKLIGHT DRIVER ELIMINATES NEED FOR PROCESSOR FOR BACKLIGHTING IN PORTABLE DEVICES

- ADI’s ADP8870 white LED charge-pump backlight driver is designed for portable applications that require excellent viewing experiences and power savings.

Norwood, MA (08/25/2010) - Analog Devices, Inc. ( ADI ), a global leader in high-performance semiconductors for signal-processing applications, today introduced the ADP8870 white LED charge-pump backlight driver that lowers the power consumption of battery-operated handheld devices by up to 45 percent without compromising viewing quality. The ADP8870 combines three key functions: a programmable backlight LED charge-pump driver with inputs for a photo transistor to automatically control the LED brightness and a PWM (pulse-width modulation) input to manage the scale of the output current. This combination of features significantly reduces power use by automatically changing the current intensity based on the ambient lighting levels and the white content of the displayed image. By performing this function automatically, the ADP8870 eliminates the need for a processor to monitor the phototransistor, further reducing power requirements and simplifying the portable backlight design.

ADP8870 charge pump backlight driver

“During common operations such as web browsing and email, LED backlighting can account for up to 75 percent of the power used by portable electronics,” said Dan Swan, product line director, Power Regulator Products, Analog Devices. “The ADP8870 employs ambient light sensing and content-adaptive backlight control techniques that will extend battery life by optimizing the main and sub display and QWERTY keypad lighting.”

The ADP8870 controls up to seven LEDs either grouped together for backlight control or used independently for keypad illumination, indicator lighting or fun lighting1. The fading of each LED is programmable allowing the designer to customize the fade-in, fade-out, dim and off times.

ADP8870 WLED Backlight Driver Key Features and Benefits

  • PWM input feature enables content adaptive backlight control
  • Photo diode input feature enables automatic ambient light sensing
  • Interrupt output feature maximizes power savings by limiting processor involvement
  • Programmable lighting transition points and hysteresis are simplified via an I2C-compatible interface
  • Sophisticated fading and dimming options enhance media viewing

Availability and Pricing

Product Samples Availability Temperature
Range
Price Each
Per 100,000
Packaging
ADP8870 Now now −40°C to +125°C $0.55 20-bump
WLCSP
ADP8870 Now now −40°C to +125°C $0.58 20-lead LFCSP

For more information, visit http://www.analog.com/pr/ADP8870?ref=PR_9-10-10 . For more information on ADI’s integrated multi-function power portfolio, visit http://www.analog.com/en/power-management/display-and-lighting/products/index.html .

ADI in Power Management

Analog Devices brings world-class signal-processing prowess to a portfolio of innovative power-management ICs that complement high-performance signal-processing functions in a wide range of portable and fixed-power applications in consumer electronics, medical equipment, industrial and instrumentation, and communications infrastructure. By supporting signal-chain design requirements, such as dynamic range, transient performance, and reliability, ADI helps customers solve complex power challenges easily and quickly, differentiate their products, and get to market faster. Learn more about ADI's power-management ICs at http://www.analog.com/power?ref=PR_9-10-10.

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.

1) Fun Lighting: Apart from the white LEDs, RGB (Red, Green, Blue) LEDs are also used to enhance the esthetic aspect of mobile phones. By mixing a precise amount of each of the three colors together, RGB LEDs allow the creation of a large palette of colors. Whenever there is an incoming call or message, and color can be used to show the caller identity in terms of a user-defined group such as friends, family or business. Fun light effects can be synchronized to the rhythm of the ring-tone melody or MP3 music. It is also very useful when the user is located in a noisy environment.

Subscribe to ADI’s News Feed.

Follow ADI on: http://www.twitter.com/ADI_News.

Editor's Contact Information:

Howard Wisniowski
781/937-1571

howard.wisniowski@analog.com

沪ICP备09046653号
Send Feedback X
content here.
content here.

Send Feedback

Close