National Semiconductor | High-performance Analog

 

 LM3407   

350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs from the PowerWise® Family
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Features

  • Input operating range 4.5V to 30V
  • Output voltage range: 0.1VIN to 0.9VIN
  • Accurate constant current output
  • Independent device enable (CMOS compatible) and PWM dimming control
  • Converter switching frequency adjustable from 300 kHz to 1 MHz
  • No external control loop compensation required
  • Supports ceramic and low ESR output capacitors
  • Input Under Voltage Lock Out (UVLO)
  • Thermal shutdown protection
  • eMSOP-8 Package
  • Description

    The LM3407 is a constant current output floating buck switching converter designed to provide constant current to high power LEDs. The device is ideal for automotive, industrial and general lighting applications. The LM3407 has an integrated power N-MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An exposed pad eMSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.


    Applications

  • LED Driver
  • Constant Current Source
  • Automotive Lighting
  • General Illumination
  • Industrial Lighting
  • WEBENCH Power Designer My Designs

    LM3407

     
    4.50 <=
    V in Lower
     V
     
    <=
    V in Upper
     V
     
    <= 30.00
    Ambient Temperature  °C <= 100
    Light Output (optional)  lumen


    What are WEBENCH® tools?

    Also Recommended
    LM34020.5A Output Current, 42V Maximum Input Voltage



    Typical Application
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    Block Diagram
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    Typical Performance
    click for larger image


    Parameters / ValuesLM3407 LM3402
    TopologyBuck Constant Current Buck
    Input Min Voltage4.5 Volt 6 Volt
    Input Max Voltage30 Volt 42 Volt
    Output Range0.45V to 27V
    Output Current350 mA 525 mA
    Efficiency (peak)96 % 96 %
    Output Min0.45 Volt 0.2 Volt
    Output Max27 Volt 40 Volt
    Special FeaturesPWM Dimming Input, Independent Device Enable, Adjustable Switching Frequency
    Adjustable OutputYes Yes
    Dimming MethodPWM PWM
    Power Factor CorrectionNone None
    On/Off PinYes Yes
    PowerGood / Error FlagUndefined No
    Output VoltageUndefined Volt Undefined Volt
    Output PowerUndefined Watt Undefined Watt
    Switching Frequency1000 kHz 1000 kHz
    Adj Switch FrequencyYes Yes
    Sync PinNo No
    Step-DownYes Yes
    Step-UpNo No
    InvertingNo No
    FlybackNo No
    RegTypeSwitching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C
    Feedback VoltageUndefined Volt
    AutomotiveYes Yes
    PowerWiseYes Yes
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3407MY/NOPB


    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1974
    FARNELLEurope and Asia1325
    MOUSERWorldwide543
    RS COMPONENTSWorldwide1005
    $0.80 each at 1K+ pcsreel
    of
    1000
    LM3407MYX/NOPB


    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide3500
    DIGI-KEYWorldwide0
    $0.80 each at 1K+ pcsreel
    of
    3500

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3407.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3407 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3407EVAL/NOPB

    350mA, Constant Current Output Floating Buck Switching Regulator Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    ARROWWorldwide10
    DIGI-KEYWorldwide10
    FARNELLEurope and Asia8
    MOUSERWorldwide3
    NEWARKAmericas4
    TAYLORAmericas13
    $37.50 each1

    Description:

    The LM3407 evaluation board contains a Pulse-Width-Modulation (PWM) floating buck converter with an integrated N-Channel power MOSFET and is designed to provide a constant current output for driving high power LEDs, such as the Lumileds Luxeon® power LEDs and OSRAM Golden DRAGON® LED.

    Contents:




    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM3407MY/NOPB

    29.851
    MINI SOIC EXP PAD81260DetailDownloadN/A
    ZXTT
    STZB
    LM3407MYX/NOPB

    29.851
    MINI SOIC EXP PAD81260DetailDownloadN/A
    ZXTT
    STZB

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3407.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3407 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM3407 Component Calculator  

    CAD Symbols and Models
    Download LM3407 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3407MYABCD15004268000639400011814314958
    LM3407MYXABCD15004268000639400011814314958

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM3407.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM3407 is located at RoHS Status.

    Arrow "Simplicity" Wireless Controlled LED Ref Design
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    Arrow "Simplicity" Wireless Controlled LED Ref Design
    Date: 2009-10-17
    Length: 0:18:35
    [Information as of 9-Feb-2012]