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ADP8860:  Charge Pump, 7-Channel Smart LED Driver with I2C Interface

Product Details


The ADP8860 combines a programmable backlight LED charge pump driver with automatic phototransistor control. This combination allows for significant power savings because it changes the current intensity in office and dark ambient light conditions. By performing this function automatically, it eliminates the need for a processor to monitor the phototransistor.

The light intensity thresholds are fully programmable via the I2C® interface. A second phototransistor input, with dedicated comparators, improves the ambient light detection levels for various user operating conditions.

The ADP8860 allows as many as six LEDs to be independently driven up to 30 mA (maximum). A seventh LED can be driven to 60 mA (maximum). All LEDs are programmable for minimum/ maximum current and fade in/out times via the I2C interface. These LEDs can also be combined into groups to reduce the processor instructions during fade in/out. Driving this entire configuration is a two-capacitor charge pump with gains of 1×, 1.5×, and 2×. This setup is capable of driving a maximum IOUT of 240 mA from a supply of 2.5 V to 5.5 V. The device includes a variety of safety features including shortcircuit, overvoltage, and overtemperature protection. These features allow easy implementation of a safe and robust design. Additionally, input inrush currents are limited via an integrated soft start combined with controlled input to output isolation. The ADP8860 is available in two package types, either a compact 2 mm × 2.4 mm × 0.6 mm WLCSP (wafer level chip scale package) or a small LFCSP (lead frame chip scale package).

FEATURES and BENEFITS

  • Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency
  • Up to two built-in comparator inputs with programmable modes for ambient light sensing
  • Outdoor, office, and dark modes for maximum backlight power savings
  • 7 independent and programmable LED drivers
    6 drivers capable of 30 mA (maximum)
    1 driver capable of 60 mA (maximum)
  • Programmable maximum current limit (128 levels)
  • Standby mode for <1μA current consumption
  • 16 programmable fade in and fade out times 0.1 sec to 5.5 sec
    Choose from linear, square, or cubic rates
  • Fading override
  • I2C-compatible interface for all programming
  • Dedicated reset pin and built-in power on reset (POR)
  • Short-circuit, overvoltage, and overtemperature protection
  • Internal soft start to limit inrush currents

Typical Operating Circuit for ADP8860

of Note ...

If purchasing either the ADP8860BDCB-EVALZ or the ADP8860DBCP-EVALZ, please make sure you also purchase the ADP886XMB1-EVALZ.
MB and eval board are both required!

Documentation

Title Content Type File Type
ADP8860: Charge Pump, 7-Channel Smart LED Driver with I2C Interface Data Sheet (Rev 0, 05/2009) (pdf, 990 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
UG-005: Software User Guide  (pdf, 471 kB)
Describes the functionality of the ADP8860 LED driver and provides software development guidelines. The ADP8860 communicates with an external processor using an I2C interface and an interrupt line (nINT). The processor sends initialization and activation commands to the ADP8860, which acts as a slave device.
User Guides PDF
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
Low-Voltage Current Sink Controls High-Voltage LED String  (pdf)
Discusses how a single programmable LED driver can be combined with a low-cost boost converter to achieve a flexible, high-efficiency, easy-to-program solution.
Analog Dialogue PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP8860 Back-light LED Linux Driver (Wiki Site) Device Drivers HTML

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

ADP8860 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP8860ACBZ-R7 Status: Production CHIPS W/SOLDER BUMPS/WLCSP 20 Ind Reel, 3000 - $1.36 Y  Material Info PCN Purchase Sample
ADP8860ACPZ-R7 Status: Production 20 ld LFCSP (4x4mm) 20 Ind Reel, 1500 - $1.70 Y  Material Info PCN Purchase Sample
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.

ADP8860 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP8860DBCP-EVALZ Status: Production Evaluation Board $170.00 Yes -

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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