National Semiconductor | High-performance Analog

 

 LM5008   
High Voltage (100V) Step Down Switching Regulator 		Click link to Download

Features

  • Integrated 100V, N-Channel buck switch
  • Internal VCC regulator
  • No loop compensation required
  • Ultra-Fast transient response
  • On time varies inversely with line voltage
  • Operating frequency remains constant with varying line voltage and load current
  • Adjustable output voltage
  • Highly efficient operation
  • Precision internal reference
  • Low bias current
  • Intelligent current limit protection
  • Thermal shutdown

    • Description

    The LM5008 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The regulator is based on a hysteretic control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit protection while providing minimum foldback. Other protection features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-voltage lockout, and Max Duty Cycle limiter

    WEBENCH® LM5008
        Min   Max   Range  
      VIN – V    9.50 – 95.00V  
      VOUT V    2.50 – 75.00V  
      IOUT A    ≤ 0.40A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM5008A▲A Version: Increases Vin Range To 6-95V
    LM5010▲1A 80V Switching Regulator


    Typical Application

    Parameters / ValuesLM5008 LM5008A LM5010
    Output Current350 mA 350 mA 1000 mA
    Input Min Voltage9.5 Volt 6 Volt 8 Volt
    Input Max Voltage95 Volt 95 Volt 75 Volt
    Output Min2.5 Volt 2.5 Volt 2.5 Volt
    Output Max75 Volt 75 Volt 70 Volt
    Frequency Min50 kHz 50 kHz 50 kHz
    Frequency Max600 kHz 600 kHz 1000 kHz
    Efficiency (peak)92 % 92 % 91 %
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    SoftStartNo No Yes
    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 100V/0.5A N-FET, Pull Ron pin to ground for shutdown Internal Startup regulator No compensation required, ultra-fast transient response
    Step-DownYes Yes Yes
    Multiple Output CapabilityNo No No
    Output PowerUndefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt
    Output Range2.5V to 75V 2.5V to 75V 2.5V to 70V
    Switching Frequency600 kHz 600 kHz 1000 kHz
    Feedback Voltage2.5 Volt 2.5 Volt 2.5 Volt
    Regulator FamilyUndefined Undefined
    Synchronous RectificationNo No No
    Quiescent Current0.485 mA 0.55 mA

    Datasheets
    TitleSizeDateOther
    Language
    LM5008 High Voltage (100V) Step Down Switching Regulator380
    Kbytes    		21-Apr-11   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1330: Application Note 1330 LM5008 Evaluation Board334
    Kbytes    		7-May-04 
    AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs574
    Kbytes    		27-Sep-06日本語
    中文
    AN-1925: Application Note 1925 LM5008A Evaluation Board439
    Kbytes    		25-Mar-10 


    Other Technical Documents
    TitleTypeDate
    Optimizing Ripple for a COT Buck ConverterExternal Article 2009-08-01
    Feedback Techniques for Crossing the Isolation BoundaryPower Designer 2007-03-22

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5008MM/NOPB

    LM5008MM

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide915
    AVNET-EMWorldwide924
    CEACAsia Pacific77000
    DIGI-KEYWorldwide3457
    FARNELLEurope and Asia3648
    NEWARKAmericas3009
    RS COMPONENTSWorldwide205
    TAYLORAmericas3088
    		$1.37 each at 1K+ pcsreel
    of
    1000
    LM5008MMX/NOPB

    LM5008MMX

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 12 weeks

     
    DistributorRegionQty
    ARROWWorldwide3500
    AVNET-EMWorldwide3500
    DIGI-KEYWorldwide0
    TAYLORAmericas3500
    		$1.37 each at 1K+ pcsreel
    of
    3500
    LM5008SDC/NOPB

    LM5008SDC

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide830
    DIGI-KEYWorldwide297
    FARNELLEurope and Asia8
    MOUSERWorldwide710
    NEWARKAmericas133
    TAYLORAmericas830
    		$1.37 each at 1K+ pcsreel
    of
    1000
    LM5008SDCX/NOPB

    LM5008SDCX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.37 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 LM5008.

    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 LM5008 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM5008EVAL
    		High Voltage (100V) Step Down Switching RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide4
    FARNELLEurope and Asia1
    NEWARKAmericas1
    		$30.00 each1

    LM5008 High Voltage (100V) Step Down Switching Regulator

    Features:

    • Integrated 100V, N-Channel buck switch
    • Internal Vcc regulator
    • No loop compensation required
    • Ultra-Fast transient response
    • On time varies inversely with line voltage
    • Operating frequency remains constant with varying line voltage and load current
    • Adjustable output voltage
    • Highly efficient operation
    • Precision internal reference
    • Low bias current
    • Intelligent current limit protection
    • Thermal shutdown

    Applications:

    • Non-Isolated telecommunication buck regulator
    • Secondary high voltage post regulator
    • +42V automotive systems

    Contents:

    • A fully assembled LM5008 evaluation board
    • LM5008 evaluation board appnote
    • LM5008 datasheet



    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
    LM5008MM/NOPB

    LM5008MM
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SAYB
    LM5008MMX/NOPB

    LM5008MMX
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SAYB
    LM5008SDC/NOPB

    LM5008SDC
    		37.567
    37.68
    		LLP81
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L5008SD
    LM5008SDCX/NOPB

    LM5008SDCX
    		37.567
    37.68
    		LLP81
    1    		260
    260    		DetailDownloadN/A
    		NS
    UZXYTT
    L5008SD

    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 LM5008.

    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 LM5008 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM5008 Quick Start Calculator  

    CAD Symbols and Models
    Download LM5008 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM5008MMABCD150XV2036010011554964327875145
    LM5008MMXABCD150XV2036010011554964327875145
    LM5008SDCABCD150XV2036010011554964327875145
    LM5008SDCXABCD150XV2036010011554964327875145

    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 LM5008.

    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 LM5008 is located at RoHS Status.

    [Information as of 8-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation