National Semiconductor | High-performance Analog

 

 LM3406   

1.5A Constant Current Buck Regulator for Driving High Power LEDs from the PowerWise® Family
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Features

  • Integrated 2.0A MOSFET
  • VIN Range 6V to 42V (LM3406)
  • VIN Range 6V to 75V (LM3406HV)
  • True average output current control
  • 1.7A Minimum Output Current Limit Over Temperature
  • Cycle-by-Cycle Current Limit
  • PWM Dimming with Dedicated Logic Input
  • PWM Dimming with Power Input Voltage
  • Simple Control Loop Compensation
  • Low Power Shutdown
  • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
  • Thermal Shutdown Protection
  • eTSSOP-14 Package
  • Description

    The LM3406/06HV are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection.


    Applications

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

    LM3406

     
    6.00 <=
    V in Lower
     V
     
    <=
    V in Upper
     V
     
    <= 42.00
    Ambient Temperature  °C <= 100
    Light Output (optional)  lumen


    What are WEBENCH® tools?

    Also Recommended
    LM3401PFET Controller, Scalable Output Current Up To 4A
    LM3402Output Current Up To 500mA
    LM3404Output Current Up To 1A
    LM3406HVExtended Input Voltage Range Up To 75V



    Typical Application
    click for larger image


    Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM3406 LM3401 LM3402 LM3404 LM3406HV
    TopologyBuck Buck Hysteretic Controller Constant Current Buck Buck Buck
    Input Min Voltage6 Volt 4.5 Volt 6 Volt 6 Volt 6 Volt
    Input Max Voltage42 Volt 35 Volt 42 Volt 42 Volt 75 Volt
    Output RangeUndefined 200 mV to Vin Undefined Undefined
    Output Current1500 mA Undefined mA 525 mA 1000 mA 1500 mA
    Efficiency (peak)96 % 92 % 96 % 96 % 96 %
    Output Min0.2 Volt 0.2 Volt 0.2 Volt 0.2 Volt 0.2 Volt
    Output MaxUndefined Volt 40 Volt 40 Volt Undefined Volt
    Special Features2 wire dimming Adjustable Hysteresis, 200 mV Reference Current Regulation 2 wire dimming
    Adjustable OutputYes Yes Yes Yes Yes
    Dimming MethodPWM, 2-Wire PWM PWM PWM PWM, 2-Wire
    Power Factor CorrectionNone None None None None
    On/Off PinYes Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
    Switching Frequency1000 kHz 1500 kHz 1000 kHz 1000 kHz 1000 kHz
    Adj Switch FrequencyYes No Yes Yes Yes
    Sync PinNo No No No No
    Step-DownYes Yes Yes Yes Yes
    Step-UpNo No No No No
    InvertingNo No No No No
    FlybackNo No No No No
    RegTypeLED Driver Switching Controller Switching Regulator Switching Regulator LED Driver
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Feedback Voltage0.2 Volt 0.2 Volt
    AEC Q-100 Automotive GradeUndefined Undefined
    AutomotiveNo Yes Yes Yes No
    PowerWiseYes Yes Yes Yes Yes
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3406MH/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide870
    FARNELLEurope and Asia349
    MOUSERWorldwide287
    NEWARKAmericas783
    $1.59 each at 1K+ pcsrail
    of
    94
    LM3406MHX/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    ARROWWorldwide12500
    DIGI-KEYWorldwide0
    TAYLORAmericas12500
    $1.59 each at 1K+ pcsreel
    of
    2500

    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 LM3406.

    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 LM3406 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3406MHEVAL/NOPB

    LM3406 - 1.5A Constant Current Buck Regulator Evaluation Board for Driving High Power LEDsFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    AVNET-EMWorldwide1
    DIGI-KEYWorldwide18
    FARNELLEurope and Asia7
    MOUSERWorldwide2
    NEWARKAmericas1
    $50.00 each1

    Description:

    The LM3406 is a buck regulator controlled current source designed to drive a series string of high power, high brightness LEDs (HBLEDs)
    such as the Luxeon™ K2 Emitter at forward currents of up to 1.5A. The converter`s output voltage adjusts as needed to maintain a constant
    current through the LED array.

    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
    LM3406MH/NOPB

    53.783
    TSSOP EXP PAD141260DetailDownloadN/A
    NSUZXYTT
    LM3406
    MH
    LM3406MHX/NOPB

    53.783
    TSSOP EXP PAD141260DetailDownloadN/A
    NSUZXYTT
    LM3406
    MH

    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 LM3406.

    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 LM3406 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - #126: Dimming Techniques for Switched-Mode LED Drivers  

    CAD Symbols and Models
    Download LM3406 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3406MHABCD150XV1038680025950002736338335
    LM3406MHXABCD150XV1038680025950002736338335

    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 LM3406.

    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 LM3406 is located at RoHS Status.

    WEBENCH® LED Architect Software Guided Tour
    Loading video...


    National's LED Drivers Deliver High Performance at Low Power
    Loading video...


    LED Driver Design for General Illumination
    Loading video...


    Automotive LED Lighting Challenges & Solutions
    Loading video...


    Driving High Power LEDs without Getting Burned - Part 1
    Loading video...


    Driving High Power LEDs without Getting Burned - Part 2
    Loading video...


    WEBENCH® LED Architect Software Guided Tour
    Date: 2010-09-08
    Length: 0:05:36
    National's LED Drivers Deliver High Performance at Low Power
    Date: 2009-01-12
    Length: 0:04:55

    LED Driver Design for General Illumination
    Date: 2009-05-04
    Length: 0:36:55
    Automotive LED Lighting Challenges & Solutions
    Date: 2009-04-14
    Length: 0:35:00
    Driving High Power LEDs without Getting Burned - Part 1
    Date: 2007-10-30
    Length: 00:57:03
    Driving High Power LEDs without Getting Burned - Part 2
    Date: 2008-01-08
    Length: 00:43:29
    [Information as of 9-Feb-2012]