National Semiconductor | High-performance Analog

 

 LM25007   

42V, 0.5A Step-Down Switching Regulator
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Features

  • Integrated 0.74 ohm N-Channel MOSFET switch
  • Guaranteed 0.5Amp output current
  • Ultra-Fast Transient Response
  • Up to 800kHz operation
  • No control loop compensation required
  • Vin feed forward provides constant operating frequency
  • 2% accurate 2.5V feedback from -40°C to 125°C
  • Highly efficient operation
  • Intelligent current limit protection
  • External shutdown control
  • Thermal shutdown
  • MSOP-8 and thermally enhanced LLP packages
  • Description

    The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a low cost, efficient, power supply. Capable of driving a 0.5Amp load over a 9V-42V input voltage range, this device is easy to apply and is provided in the small MSOP-8 and the thermally enhanced LLP-8 packages. Ultra-fast transient response is achieved through the use of a constant on-time architecture with Vin feed forward. This feature provides an almost constant operating frequency over load and input voltage variations. The operating frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of component selection. An intelligent current limit is implemented in the LM25007 with forced off time that is inversely proportional to Vout thus ensuring recovery from fault conditions. The output voltage may be set from 2.5V to >30V. To improve efficiency in light load applications, the Vcc pin can be connected to an external voltage source to eliminate the drop through the internal regulator. Additional features include: thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter.

    WEBENCH® LM25007
        Min   Max   Range  
      VIN V    9.00 – 42.00V  
      VOUT V    2.50 – 42.00V  
      IOUT A    ≤ 0.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM250101A 42V Switching Regulator
    LM5007Higher Voltage Range (80V) Version



    Typical Application
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    Connection Diagram
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    Typical Performance
    *click for larger image


    Parameters / ValuesLM25007 LM25010 LM5007
    Output Current500 mA 1000 mA 500 mA
    Input Min Voltage9 Volt 6 Volt 9 Volt
    Input Max Voltage42 Volt 42 Volt 75 Volt
    Output Min2.5 Volt 2.5 Volt 2.5 Volt
    Output Max37 Volt 37 Volt 73 Volt
    Frequency Min50 kHz 50 kHz 50 kHz
    Frequency Max800 kHz 1000 kHz 800 kHz
    Efficiency (peak)93 % 95 % 93 %
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    SoftStartNo Yes No
    Sync PinNo No No
    InvertingYes Yes Yes
    FlybackNo No No
    RegTypeSwitching Regulator Switching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes
    Adj Switch FrequencyYes Yes Yes
    PWM ModeConstant on-time Constant on-time Constant on-time
    TopologyBuck Buck Buck
    Special FeaturesInternal startup regulator for Vin>9V, internal 42V/07A N-FET, Pull Ron pin to ground for shutdown Ultra-fast transient response Internal startup regulator for Vin>9V, internal 80V/0.7A N-FET, Pull Ron pin to ground for shutdown
    Step-DownYes Yes Yes
    Multiple Output CapabilityNo No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt
    Output Range2.5V to 37V 2.5V to 37V 2.5V to 73V
    Switching Frequency800 kHz 1000 kHz 800 kHz
    Feedback Voltage2.5 Volt 2.5 Volt 2.5 Volt
    Regulator FamilyUndefined Undefined Undefined
    AutomotiveYes Yes Yes
    Synchronous RectificationNo No No

    Datasheets
    TitleSizeDateOther
    Language
    LM25007 42V, 0.5A Step-Down Switching Regulator283
    Kbytes
    5-Feb-08日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1453: Application Note 1453 LM25007 Evaluation Board637
    Kbytes
    15-Mar-06日本語
    AN-2129: Application Note 2129 Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter174
    Kbytes
    14-Mar-11 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25007MM/NOPB

    LM25007MM

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2074
    AVNET-EMWorldwide675
    DIGI-KEYWorldwide13517
    FARNELLEurope and Asia1006
    MOUSERWorldwide901
    NEWARKAmericas547
    RS COMPONENTSWorldwide444
    TAYLORAmericas2089
    $1.25 each at 1K+ pcsreel
    of
    1000
    LM25007MMX/NOPB

    LM25007MMX

    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.25 each at 1K+ pcsreel
    of
    3500
    LM25007SD/NOPB

    LM25007SD

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide5770
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide2436
    FARNELLEurope and Asia792
    MOUSERWorldwide1000
    NEWARKAmericas792
    RS COMPONENTSWorldwide784
    TAYLORAmericas5770
    $1.25 each at 1K+ pcsreel
    of
    1000
    LM25007SDX/NOPB

    LM25007SDX

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.25 each at 1K+ pcsreel
    of
    4500

    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 LM25007.

    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 LM25007 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25007EVAL
    Evaluation Board for 42V, 0.5A Step-Down Switching RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    TAYLORAmericas3
    $33.80 each1

    Description:

    LM25007 42V, 0.5A Step-Down Switching Regulator

    Features:

    • Integrated 0.74 ohm N-Channel MOSFET switch
    • Guaranteed 0.5Amp output current
    • Ultra-Fast Transient Response
    • Up to 800kHz operation
    • No control loop compensation required
    • Vin feed forward provides constant operating frequency
    • 2% accurate 2.5V feedback from -40°C to 125°C
    • Highly efficient operation
    • Intelligent current limit protection
    • External shutdown control
    • Thermal shutdown
    • MSOP-8 and thermally enhanced LLP packages

    Applications:

    • 12VDC and 24VDC distributed rail systems
    • 24VAC systems
    • Automotive body electronics and telematics
    • Industrial systems
    • HB-LED constant current source

    Contents:

    • A fully assembled LM25007 evaluation board
    • LM25007 datasheet
    • LM25007 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
    LM25007MM/NOPB

    LM25007MM
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    SLYB
    LM25007MMX/NOPB

    LM25007MMX
    29.851
    30.002
    MINI SOIC81
    1
    260
    260
    DetailDownloadN/A
    ZXTT
    SLYB
    LM25007SD/NOPB

    LM25007SD
    40.107
    40.25
    LLP81
    1
    260
    260
    DetailDownloadN/A
    NS
    UZXYTT
    25007SD
    LM25007SDX/NOPB

    LM25007SDX
    40.107
    40.25
    LLP81
    1
    260
    260
    DetailDownloadN/A
    NS
    UZXYTT
    25007SD

    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 LM25007.

    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 LM25007 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM25007 Quick Start Calculator  

    CAD Symbols and Models
    Download LM25007 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM25007MMABCD150XV1038680025950002736338335
    LM25007MMXABCD150XV1038680025950002736338335
    LM25007SDABCD150XV1038680025950002736338335
    LM25007SDXABCD150XV1038680025950002736338335

    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 LM25007.

    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 LM25007 is located at RoHS Status.

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


    An Introduction to High Brightness LED Applications and Driving Techniques
    Date: 2007-11-17
    Length: 00:50:00
    [Information as of 8-Feb-2012]