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Overview

Features and Benefits

  • 350mA Constant Current Output
  • 2.8V to 4V Output Compliance
  • 1- or 2-Cell NiMH or Alkaline Input
  • Synchronous Rectification: Up to 90% Efficiency
  • Fixed Frequency Operation: 1.3MHz
  • Low Quiescent Current: <1mA
  • Very Low Shutdown Current: <50µA
  • Open LED Output Limited to 4.7V
  • VIN Range: 1V to 3.2V
  • Dimming Control
  • Undervoltage Lockout to Protect Batteries
  • Low Profile (0.75mm) 3mm × 3mm Thermally Enhanced 8-Lead DD and S8 Packages

Product Details

The LTC3490 provides a constant current drive for 1W LED applications. It is a high efficiency boost converter that operates from 1 or 2 NiMH or alkaline cells and generates 350mA of constant current with up to 4V of compliance. It contains a 100mΩ NFET switch and a 130mΩ PFET synchronous rectifier. The fixed switching frequency is internally set to 1.3MHz.

The LTC3490 limits the output voltage to 4.7V if the output load is disconnected. It also features an analog dimming capability that reduces the drive current proportional to the CTRL/SHDN pin voltage. A low-battery logic output signals when the battery has dropped below 1V/cell. An undervoltage lockout circuit shuts down the LTC3490 when the battery voltage drops below 0.85V/cell. The feedback loop is internally compensated to minimize component count.

Applications

  • Portable Lighting
  • Rechargeable Flashlights

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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 (1)

Documentation & Resources

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  • 3rd Party Solutions (1)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Technical Articles (1)
    • Document Type

    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    To launch ready-to-run LTspice demonstration circuits for this part:

    Step 1: Download and install LTspice on your computer.

    Step 2: Click on the link in the section below to download a demonstration circuit.

    Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

    LTspice

    LTspice Simulations

    LTC3490 Demo Circuit - 1W White LED Driver (1.8-3.5V to 4V Max @ 350mA)

    Models for the following parts are available in LTspice:

    LTC3490

    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
    LTC3490EDD#PBF Material Declaration Reliability Data 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)
    LTC3490EDD#TRPBF Material Declaration Reliability Data 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)
    LTC3490ES8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC3490ES8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    Wafer Fabrication Data R415 Reliability Data

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    Select Model for PCN Information
    • LTC3490ES8#PBF Production
    • LTC3490ES8#TRPBF Production

    Support & Discussions

    LTC3490 Contact ADI Technical Support »
    LTC3490 Ask your question »
    LTC3490 Contact ADI Technical Support » LTC3490 Ask your question »

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