1. Products
  2. Power Management
  3. LED Driver IC
  4. Inductorless (Charge Pump) LED Drivers
  5. LTC3220

Data Sheet
JP
User Guides
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Overview

Features and Benefits

  • Eighteen 20mA Universal Current Sources with 64-Step Linear Brightness Control
  • Independent On/Off, Brightness Level, Blinking and Gradation Control for Each Current Source Using 2-Wire I2C Interface
  • Low Noise Multi-Mode Charge Pump (1x, 1.5x, 2x) Provides Up to 91% Efficiency
  • Slew Limited Switching Reduces Conducted and Radiated Noise (EMI)
  • Up to 360mA Total Output Current
  • Internal Current Reference
  • Single Reset Pin for Asynchronous Shutdown and Reset of All Data Registers
  • Two I2C Addresses Are Available (LTC3220: 0011100, LTC3220-1: 0011101)
  • Automatic or Forced Mode Switching
  • Internal Soft-Start Limits Inrush Current
  • Short-Circuit/Thermal Protection
  • 4mm × 4mm Ultrathin (0.55mm) 28-Lead QFN Package

Product Details

The LTC3220/LTC3220-1 are highly integrated multi-display LED drivers. These parts contain a high efficiency, low noise charge pump to provide power to up to eighteen universal LED current sources. The LTC3220/LTC3220-1 require only five small ceramic capacitors to form a complete LED power supply and current controller.

The LED currents are set by an internal precision current reference. Independent dimming, on/off, blinking and gradation control for all universal current sources is achieved via the I2C serial interface. 6-bit linear DACs are available to adjust brightness levels independently for each universal LED current source.

The LTC3220/LTC3220-1 charge pump optimizes efficiency based on the voltage across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The first dropout switches the parts into 1.5x mode and a subsequent dropout switches the LTC3220/LTC3220-1 into 2x mode. The parts reset to 1x mode whenever a data bit is updated via the I2C port.

Applications

  • Video Phones with QVGA+ Displays
  • Keypad Lighting
  • General/Miscellaneous Lighting

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • Application Notes (1)
  • User Guides (1)
  • Press Releases (1)
    • Document Type

    Product Recommendations

    LTC3220 Companion Parts

    Recommended D/A Converters

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC3220EPF#PBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220EPF#TRPBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220EPF-1#PBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220EPF-1#TRPBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220IPF#PBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220IPF#TRPBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220IPF-1#PBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    LTC3220IPF-1#TRPBF Material Declaration Reliability Data 28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)
    Wafer Fabrication Data R415 Reliability Data

    Support & Discussions

    LTC3220 Discussions

    RE: LTC3220 LED Driver 5-volt power supply
    All LTC3220 Discussions
    LTC3220 Contact ADI Technical Support »
    LTC3220 Ask your question »
    LTC3220 Contact ADI Technical Support » LTC3220 Ask your question »

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