National Semiconductor | High-performance Analog

 

 LM3402   
0.5A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family		 Click link to Download

Features

  • Integrated 0.5A N-channel MOSFET
  • VIN Range from 6V to 42V (LM3402)
  • VIN Range from 6V to 75V (LM3402HV)
  • 500 mA Output Current Over Temperature
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power Shutdown
  • Supports all-ceramic output capacitors and capacitor-less outputs
  • Thermal shutdown protection
  • MSOP-8, PSOP-8 Packages

    • Description

    The LM3402/02HV 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 735 mA (typical) for step-down (Buck) regulators. Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and thermal shutdown complete the feature set.


    Applications

  • LED Driver
  • Constant Current Source
  • Automotive Lighting
  • General Illumination
  • Industrial Lighting

    • WEBENCH Power Designer My Designs

    LM3402
     
    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
    LM3401▲Vin 4.5V To 35V, External PFET For Up To 4.0A Output Current
    LM3402HV▲For Vin Range 6V To 75V
    LM3404▲For 1.0A Output Current
    LM3405A▲Vin 3.0V To 22V, Up To 1.0A Output Current, Fixed 1.6 MHz Switching Frequency
    LM3407▲Vin 4.5V To 30V, Adjustable Switching Frequency, EMSOP-8 Package



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM3402 LM3401 LM3402HV LM3404 LM3405A LM3407
    TopologyConstant Current Buck Buck Hysteretic Controller Constant Current Buck Buck Buck Buck
    Input Min Voltage6 Volt 4.5 Volt 6 Volt 6 Volt 3 Volt 4.5 Volt
    Input Max Voltage42 Volt 35 Volt 75 Volt 42 Volt 22 Volt 30 Volt
    Output Current525 mA Undefined mA 525 mA 1000 mA 1000 mA 350 mA
    Efficiency (peak)96 % 92 % 96 % 96 % 92 % 96 %
    Output Min0.2 Volt 0.2 Volt 0.2 Volt 0.2 Volt 0.2 Volt 0.45 Volt
    Output Max40 Volt 73 Volt 40 Volt 20 Volt 27 Volt
    Adjustable OutputYes Yes Yes Yes Yes Yes
    Dimming MethodPWM PWM PWM PWM PWM PWM
    Power Factor CorrectionNone None None None None None
    On/Off PinYes Yes Yes Yes Yes Yes
    PowerGood / Error FlagNo No No No No Undefined
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
    Switching Frequency1000 kHz 1500 kHz 1000 kHz 1000 kHz 1600 kHz 1000 kHz
    Adj Switch FrequencyYes No Yes Yes No Yes
    Sync PinNo No No No No No
    Step-DownYes Yes Yes Yes Yes Yes
    Step-UpNo No No No No No
    InvertingNo No No No No No
    FlybackNo No No No No No
    RegTypeSwitching Regulator Switching Controller Switching Regulator Switching Regulator Switching Regulator Switching Regulator
    Temperature Min-40 deg C -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 125 deg C
    AutomotiveYes Yes Yes Yes Yes Yes
    PowerWiseYes Yes Yes Yes Yes Yes
    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3402MM/NOPB

    LM3402MM

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AITGAsia Pacific1001
    ARROWWorldwide1000
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide7392
    FARNELLEurope and Asia680
    MOUSERWorldwide600
    NEWARKAmericas610
    RSL MICROAsia Pacific10000
    TAYLORAmericas1000
    		$1.05 each at 1K+ pcsreel
    of
    1000
    LM3402MMX/NOPB

    LM3402MMX

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.05 each at 1K+ pcsreel
    of
    3500
    LM3402MR/NOPB


    RoHS Status

    PSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide22
    AVNET-EMWorldwide385
    DIGI-KEYWorldwide259
    FARNELLEurope and Asia409
    MOUSERWorldwide67
    NEWARKAmericas399
    TAYLORAmericas22
    		$1.05 each at 1K+ pcsrail
    of
    95
    LM3402MRX/NOPB


    RoHS Status

    PSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2489
    		$1.05 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 LM3402.

    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 LM3402 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3402EVAL/NOPB

    		LM3402MA (Mini SOIC) - 0.5A Constant Current Buck Regulator for HB LEDs (LM3402EVAL Board)Full production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide3
    FARNELLEurope and Asia5
    NEWARKAmericas3
    		$37.50 each1

    Description:

    LM3402MA 0.5A Constant Current Buck Regulator for Driving High Power LEDs

    Features:

    • Integrated 0.5A N-Channel MOSFET
    • Vin Range from 6V to 42V (LM3402)
    • 500 mA Output Current Over Temperature
    • Cycle-by-Cycle Current Limit
    • No Control Loop Compensation Required
    • Separate PWM Dimming and Low Power Shutdown
    • Supports all-ceramic output capacitors and capacitor-less outputs
    • Thermanl shutdown protection
    • MSOP-package

    Applications:

    • LED Driver
    • Constant Current Source
    • Automotive Lighting
    • General Illumination
    • Industrial Lighting

    Contents:

    • A fully assembled LM3402MA based evaluation board
    • LM3402 datasheet
    • AN-1500 - LM3402/HV (Mini SOIC package) evaluation board appnote

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3404FSTDIMEV/NOPB

    		LM3404FSTDIMEV - Fast Dimming and True Constant LED Current Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia1
    MOUSERWorldwide1
    TAYLORAmericas4
    		$40.00 each1

    Description:

    The LM3404/04HV are buck regulator derived controlled current sources designed to drive a series string of high power, high brightness LEDs (HBLEDs) at forward currents of up to 1.0A (LM3404/04HV). This evaluation board demonstrates the enhanced thermal performance, fast dimming and true constant LED current capabilities of the LM3402 and LM3404 devices.

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3404MREVAL
    		LM3402/LM3404 High Power PSOP-8 Evaluation boardFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide3
    FARNELLEurope and Asia5
    MOUSERWorldwide1
    NEWARKAmericas2
    		$37.50 each1

    Features:

    • Integrated 1.0A MOSFET
    • VIN Range 6V to 42V (LM3404)
    • VIN Range 6V to 75V (LM3404HV)
    • 1.2A Output Current Over Temperature
    • Cycle-by-Cycle Current Limit
    • No Control Loop Compensation Required
    • Separate PWM Dimming and Low Power Shutdown
    • Supports All-Ceramic Output Capacitors and Capacitor-Less Outputs
    • Thermal Shutdown Protection
    • SO-8 Package, PSOP-8 Package

    Applications:

    • LED Driver
    • Constant Current Source
    • Automotive Lighting
    • General Illumination
    • Industrial Lighting

    Contents:

    • A fully assembled LM3404HVMR PSOP based evaluation board
    • LM3404HV datasheet
    • AN-1585 - LM3404/HV (PSOP package) evaluation board appnote



    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
    LM3402MM/NOPB

    LM3402MM
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SNEB
    LM3402MMX/NOPB

    LM3402MMX
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SNEB
    LM3402MR/NOPB

    		77.907
    		PSOP83260DetailDownloadN/A
    		NSXYTT
    L3402
    MR
    LM3402MRX/NOPB

    		77.907
    		PSOP83260DetailDownloadN/A
    		NSXYTT
    L3402
    MR

    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 LM3402.

    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 LM3402 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LED Reference Design Library  
    Article - Driving High-Power LEDS  

    CAD Symbols and Models
    Download LM3402 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3402MMABCD150XV1038680025950002736338335
    LM3402MMXABCD150XV1038680025950002736338335
    LM3402MRABCD150XV1038680025950002736338335
    LM3402MRXABCD150XV1038680025950002736338335

    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 LM3402.

    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 LM3402 is located at RoHS Status.

    An Introduction to High Brightness LED Applications and Driving Techniques
    Click image to play video in new window


    WEBENCH LED Designer -- LED Driver Design in Minutes
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    WEBENCH® LED Architect Software Guided Tour
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    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...


    An Introduction to High Brightness LED Applications and Driving Techniques
    Date: 2007-11-17
    Length: 00:50:00
    WEBENCH LED Designer -- LED Driver Design in Minutes
    Date: 2009-02-03
    Length: 0:5:02
    WEBENCH® LED Architect Software Guided Tour
    Date: 2010-09-08
    Length: 0:05:36
    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 3-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation