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  5. LTC3218

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Overview

Features and Benefits

  • Low Noise Constant-Frequency Operation
  • Multi-Mode Operation: 1x or 2x Boost Mode
  • Automatic Mode Switching
  • High Output Current: 150mA (Continuous), 400mA (Pulsed) From Li-Ion/Polymer Input
  • 2-Second Flash Current Timeout for LED Protection
  • Automatic Soft-Start
  • Output Disconnect
  • No Inductors
  • 220mΩ Internal High Side Current Sense Resistor
  • Single Resistor Programming Capability
  • Tiny Application Circuit (3mm × 2mm DFN Package, All Components < 1mm High)

Product Details

The LTC3218 is a low-noise, high-current charge pump DC/DC converter capable of driving high current LEDs at up to 400mA from a 2.9V to 4.5V input. A low external parts count (one flying capacitor, two programming resistors and two bypass capacitors at VIN and CPO) make the LTC3218 ideally suited for small, battery-powered applications.

Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A built-in 2-second timer protects the LED during flash mode.

Output current level is programmed by an external resistor. LED current is regulated using an internal high side 220mΩ sense resistor. Automatic mode switching optimizes efficiency by monitoring the voltage across the charge pump and switching modes only when dropout is detected. The part is available in a low profile 3mm × 2mm 10-lead DFN package.

Applications

  • LED Torch/Flash Supply for DSCs/Cellphones

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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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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Technical Articles (1)
    • Document Type

    Tools & Simulations

    LTspice

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    LTC3218

    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
    LTC3218EDDB#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LTC3218EDDB#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    Wafer Fabrication Data R415 Reliability Data

    Support & Discussions

    LTC3218 Contact ADI Technical Support »
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    LTC3218 Contact ADI Technical Support » LTC3218 Ask your question »

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