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ADP5501:  Programmable Current Backlight Driver with Ambient Light Sensor Input

Product Details

Newer Alternatives: NEW DESIGNS consider the ADP5520 Backlight Driver with I/O Expander.

The ADP5501 is a versatile, single-chip, white LED backlight driver with programmable ambient light sensor input and programmable LED current. This device is designed for media-enabled handset applications. The ADP5501 uses an I2C®-compatible serial interface and a single line interrupt to communicate with the host processor.

The ADP5501 can detect ambient light levels and adjust the backlight brightness accordingly, resulting in extended battery life. Once configured, the ADP5501 is capable of controlling the display backlight intensity, on/off timing, dimming, and fading without the intervention of the main processor, which translates into valuable battery power savings. The three auxiliary LEDs are also capable of fading and are timed on and off via register programming.


  • Efficient asynchronous boost converter for driving up to 6 white LEDs
  • 2.7 V to 5.5 V input voltage range
  • 128 programmable backlight LED current levels (30 mA maximum)
  • Programmable backlight fade-in/fade-out times
  • Programmable backlight dim and off times
  • Ambient light sensing with autonomous backlight adjustment
  • 3 auxiliary LED current sinks
  • 64 programmable auxiliary LED current levels (14 mA maximum)
  • Programmable auxiliary LED fade-in/fade-out times
  • Programmable auxiliary LED on and off times (allows blinking)
  • I2C-compatible serial interface
  • More Features are found on the data sheet

Functional Block Diagram for ADP5501


Title Content Type File Type
Programmable Current Backlight Driver with Ambient Light Sensor Input Data Sheet (Rev 0, 11/2008) (pdf, 1112 kB) Data Sheets PDF
Introduction to ADIsimPower
ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
Videos HTML
Isolating Power in Communication Bus and Gate Drive Applications
Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.
Webcasts WEBCAST
Innovative Power Reduction Techniques Enable Handset Manufacturers to Provide Media Rich Devices
The demand for mobile devices with high-end features has been rapidly increasing. Features like text messaging, gaming, GPS navigation, web browsing and video playback on high resolution color displays are becoming the norm in today’s portable consumer electronics market.
(LED Journal, August/September 2009)
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Integrated Power Solutions for Xilinx FPGAs  (pdf, 2253 kB)
Combining multiple switching regulators and LDOs into a single package enables very small, flexible, highly efficient power management solutions for powering FPGAs.
Solutions Bulletins PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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ADIsim Design/Simulation Tools HTML
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Vin (max) V Iout A

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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