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ADP5520:  Backlight Driver with I/O Expander

Product Details

The ADP5520 is a versatile single-chip, white LED backlight driver with a user configurable I/O expander. This device fits handset applications where the flip or slider section of the phone requires backlighting, I/O signaling and detecting, auxiliary LED lighting, and keypad functions. By incorporating an I2C® compatible serial interface and a single line interrupt, the ADP5520 significantly reduces the total number of lines required to interface with the baseband processor across the hinge flex.

The ADP5520 can detect ambient light levels and adjust the backlight brightness accordingly, resulting in extended battery operation.

Once configured, the ADP5520 is capable of controlling the flip/slider backlight intensity, on/off timing, dimming, and fading without the intervention of the main processor, which results in valuable battery power saving.


  • 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)
  • Ambient light sensing with autonomous backlight adjustment
  • Programmable backlight fade-in/fade-out times
  • Programmable backlight dim and off times
  • 8 configurable GPIO pins (input, output, up to 4 × 4 keypad)
  • Up to 3 auxiliary LED current sinks (1 dedicated, 2 configurable)
  • 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)
  • See data sheet for additional features

ADP5520 Functional Block Diagram

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Title Content Type File Type
ADP5520: Backlight Driver with I/O Expander Data Sheet (Rev A, 01/2010) (pdf, 1365 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)
Technical Articles HTML
ADP5520 LED Driver  (pdf, 581 kB)
The ADP5520 demo board drives up to 6 LEDs in series and a RGB LED. The toggle switch S1 specifies one of two modes of operations for the demo board on GPIO (PC0) of a micro controller.
Power Reference Designs PDF
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

Design Tools,Models,Drivers & Software

Title Content Type File Type
Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
ADIsim Design/Simulation Tools HTML
ADIsimPower™ Voltage Regulator Design Tool
This expert design tool produces custom DC-DC converter designs in about a minute. The user enters 5 inputs and chooses to optimize for efficiency, PCB space, cost, or part count. Output is a complete schematic, BOM, efficiency plot, and performance summary. A PDF summary and a blank PCB is offered for each design to facilitate fast prototyping to verify the design.
ADIsim Design/Simulation Tools HTML
ADP5520/01 MFD Linux Driver Device Drivers HTML
Launch of ADIsimPower Voltage Regulator Selection Vin (min) V Vout V   Find Solutions
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Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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.

SampleSample & Buy

Price, packaging, availability

ADP5520 Model Options
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADP5520 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADP5520-EVALZ Status: Obsolete Evaluation Board - Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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