National Semiconductor | High-performance Analog

 

 LM3405   

1.6MHz 1A Constant Current Buck Regulator for Powering LEDs from the PowerWise® Family
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Features
  • VIN operating range of 3V to 15V
  • Thin SOT23-6 package
  • 1.6MHz switching frequency
  • 300mΩ NMOS switch
  • 40nA shutdown current at VIN = 5V
  • EN/DIM input for enabling and PWM dimming of LEDs
  • Internally compensated current-mode control
  • Cycle-by-cycle current limit
  • Input voltage UVLO
  • Over-current protection
  • Thermal shutdown
  • Description

    Integrated with a 1A power switch, the LM3405 is a current-mode control switching buck regulator designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is internally set to 1.6MHz, allowing small surface mount inductors and capacitors to be used. The LM3405 utilizes current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and over-current protection.


    Applications

  • LED Driver
  • Constant Current Source
  • Industrial Lighting
  • LED Flashlights
  • Also Recommended
    LM3405AExtended Input Voltage Range Up To 22V


    redraw to make it compact

    Parameters / ValuesLM3405 LM3405A
    TopologyBuck Buck
    Input Min Voltage3 Volt 3 Volt
    Input Max Voltage15 Volt 22 Volt
    Output Range0.2V to 13.5V 0.2V to 20V
    Output Current1000 mA 1000 mA
    Efficiency (peak)92 % 92 %
    Output Min0.2 Volt 0.2 Volt
    Output Max13.5 Volt 20 Volt
    Adjustable OutputYes Yes
    Dimming MethodPWM PWM
    Power Factor CorrectionNone None
    On/Off PinYes Yes
    PowerGood / Error FlagNo No
    Switching FrequencyUndefined kHz 1600 kHz
    Adj Switch FrequencyNo No
    Sync PinNo No
    Step-DownYes Yes
    RegTypeSwitching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C
    Feedback Voltage0.2 Volt 0.2 Volt
    PowerWiseYes Yes
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3405XMK/NOPB

    LM3405XMK

    RoHS Status


    TSOT
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1454
    FARNELLEurope and Asia509
    MOUSERWorldwide1824
    NEWARKAmericas509
    $0.95 each at 1K+ pcsreel
    of
    1000
    LM3405XMKX/NOPB

    LM3405XMKX

    RoHS Status


    TSOT
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $0.95 each at 1K+ pcsreel
    of
    3000

    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 LM3405.

    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 LM3405 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3405XEVAL/NOPB

    1.6MHz, 1A Constant Current Buck Regulator for Powering LEDsFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $40.50 each1

    Features:

    • VIN operating range of 3V to 15V
    • Thin SOT23-6 package
    • 1.6MHz switching frequency
    • 300mΩ NMOS switch
    • 40nA shutdown current at VIN = 5V
    • EN/DIM input for enabling and PWM dimming of LEDs
    • Internally compensated current-mode control
    • Cycle-by-cycle current limit
    • Input voltage UVLO
    • Over-current protection
    • Thermal shutdown

    Applications:

    • LED Driver
    • Constant Current Source
    • Industrial Lighting
    • LED Flashlights

    Contents:

    • A LM3405X Fully Assembled Evaluation Board
    • A LM3405 Datasheet
    • A LM3405 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
    LM3405XMK/NOPB

    LM3405XMK
    13.726
    13.851
    TSOT61
    1
    260
    260
    DetailDownloadN/A
    SPNB
    XTT
    LM3405XMKX/NOPB

    LM3405XMKX
    13.726
    13.851
    TSOT61
    1
    260
    260
    DetailDownloadN/A
    SPNB
    XTT

    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 LM3405.

    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 LM3405 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - Contact us for questions on this product  

    CAD Symbols and Models
    Download LM3405 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3405XMKPVIP0500142800017550003497986041
    LM3405XMKXPVIP0500142800017550003497986041

    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 LM3405.

    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 LM3405 is located at RoHS Status.

    [Information as of 9-Feb-2012]