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  4. Inductorless (Charge Pump) LED Drivers
  5. LTC3230

Data Sheet
User Guides
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Overview

Features and Benefits

  • Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching
  • Multimode Operation: 1x, 1.5x, 2x
  • Full-Scale Current Set Resistor
  • Up to 125mA Total LED Current
  • Single Wire Enable/Brightness Control for Main and Sub Display LEDs
  • 32:1 Linear LED Brightness Control
  • Dual 200mA Linear Regulators
  • Four 25mA Low Dropout Main LED Current Sources
  • One 25mA Low Dropout Sub LED Current Source
  • Low Noise Constant Frequency Operation
  • Low Shutdown Current: 3µA
  • Internal Soft-Start Limits Inrush Current During Start-Up and Mode Switching
  • Open/Short LED Protection
  • No Inductors
  • 20-Lead 3mm x 3mm QFN Package

Product Details

The LTC3230 is a low noise charge pump DC/DC converter designed to drive 4 Main LEDs and 1 Sub LED, plus two 200mA linear regulators to provide additional system power. The LTC3230 charge pump requires only four small ceramic capacitors and one current set resistor to form a complete LED power supply and current controller.

Built-in soft-start circuitry prevents excessive inrush cur- rent during start-up and mode changes. High switching frequency enables the use of small external capacitors. Main and Sub full-scale current settings are programmed by a single external resistor.

Charge pump efficiency is optimized based on the voltage across the LED current sources. The part powers up in 1x mode and automatically switches to the next higher mode, 1.5x and subsequently 2x, whenever any LED current source approaches dropout.

Two 200mA linear regulators have independent enable and output voltage select pins. Each regulator can be set to one of three pre-selected output voltages with tri-level input pins. The regulators may be enabled independently of the charge pump.

The LTC3230 is available in a low profile (0.75mm) 3mm x 3mm 20-lead QFN package.

Applications

  • Multi-LED Driver and Dual LDO Supplies for Cell Phone, PDA, Digital Camera and PND Applications

 

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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)
  • User Guides (1)
  • Press Releases (1)
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    Tools & Simulations

    LTspice

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    LTspice

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    LTC3230

    Product Recommendations

    LTC3230 Companion Parts

    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
    LTC3230EUD#PBF Material Declaration Reliability Data 20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC3230EUD#TRPBF Material Declaration Reliability Data 20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    Wafer Fabrication Data

    Support & Discussions

    LTC3230 Contact ADI Technical Support »
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