National Semiconductor | High-performance Analog

 

 LM3000   

Dual Synchronous Emulated Current-Mode Controller from the PowerWise® Family
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Features

  • VIN range from 3.3V to 18.5V
  • Output voltage from 0.6V to 80% of VIN
  • Remote differential output voltage sensing
  • 1% accuracy at FB pin
  • Interleaved operation reduces input capacitors
  • Frequency sync/adjust from 200 kHz to 1.5 MHz
  • Startup with pre-bias load
  • Independent power good, enable, soft-start and track
  • Programmable current limit without external sense resistor
  • Hiccup mode short circuit protection
  • Description

    The LM3000 is a dual output synchronous buck controller which is designed to convert input voltages ranging from 3.3V to 18.5V down to output voltages as low as 0.6V. The two outputs switch at a constant programmable frequency of 200 kHz to 1.5 MHz, with the second output 180 degrees out of phase from the first to minimize the input filter requirements. The switching frequency can also be phase locked to an external frequency. A CLKOUT provides an external clock 90 degrees out of phase with the main clock so that a second chip can be run out of phase with the main chip. The emulated current-mode control utilizes bottom side FET sensing to provide fast transient response and current limit without the need for external current sense resistors or RC networks. Separate Enable, Soft-Start and Track pins allow each output to be controlled independently to provide maximum flexibility in designing system power sequencing.

    The LM3000 has a full range of protection features which include input under-voltage lock-out (UVLO), power good (PGOOD) signals for each output, over-voltage crowbar and hiccup mode during short circuit events.


    Applications

  • DC Power Distribution Systems
  • Graphic Cards - GPU and Memory ICs
  • FPGA, CPLD, and ASICs
  • Embedded Processor
  • 1.8V and 2.5V I/O Supplies
  • Networking Equipment (Routers, Hubs)


  • Simplified Application

     

    ParametersValues
    Output Current 20000 mA
    Input Min Voltage 3.3 Volt
    Input Max Voltage 18.5 Volt
    Feedback Voltage 0.6 Volt
    Feedback Tolerance 1 %
    Frequency Min 200 kHz
    Frequency Max 1500 kHz
    Efficiency (peak) 95 %
    Output Range 0.6V to 15V
    Adj Switch Frequency Yes
    Adjustable Output Yes
    Synchronous Rectification Yes
    On/Off Pin Yes
    PowerGood / Error Flag Yes
    SoftStart Yes
    Sync Pin Yes
    Inverting No
    Flyback No
    Lossless Current Sense Yes
    RegType Switching Controller
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Channels 2 Channels
    Special Features Independent power good, enable, soft-start and track
    Topology Synchronous Buck
    PWM Mode Emulated Peak Current Mode
    Step-Down Yes
    Step-Up No
    Multiple Output Capability Yes
    Output Max 15 Volt
    Output Min 0.6 Volt
    Automotive Yes
    PowerWise Yes
    Quiescent Current 5 mA

    Datasheets
    TitleSizeDateOther
    Language
    LM3000 Dual Synchronous Emulated Current-Mode Controller801
    Kbytes
    2-Jul-09   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1951: Application Note 1951 LM3000 Evaluation Board1497
    Kbytes
    1-Jul-09 


    Other Technical Documents
    TitleTypeDate
    PCPM | Peak Current-Mode DC-DC Converter Stability AnalysisExternal Article 2010-06-01

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3000SQ/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1808
    FARNELLEurope and Asia1000
    MOUSERWorldwide1000
    NEWARKAmericas1000
    $2.85 each at 1K+ pcsreel
    of
    1000
    LM3000SQX/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $2.85 each at 1K+ pcsreel
    of
    4500

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM3000ASQ
    LMK3000SQ
    NATIONAL SEMICONDUCTOR
    05 Nov 2010
    LM3000ASQX
    LM3000SQX
    NATIONAL SEMICONDUCTOR
    05 Oct 2010

    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 LM3000.

    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 LM3000 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3000EVAL/NOPB

    Evaluation Board for the LM3000Full production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia5
    MOUSERWorldwide1
    NEWARKAmericas5
    $180.00 each1

    Description:

    The LM3000 evaluation board is designed to provide design engineer with a fully functional power converter based solution using Dual Output Emulated Current Mode Controller in LM3000. This evaluation board provides two output voltages of 3.3V and 1.2V. The 3.3V output is designed to handle a maximum current of 8A; whereas the 1.2V output has a maximum current capability of 15A. The switching frequency for the converter is set at 500 kHz. The gate signals for each output voltage will be 180 degree out of phase from each other. The printed circuit board consists of 4 layers of FR4 material with 2 ounce copper on top and bottom layer and 1 ounce copper for internal layers.

    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
    LM3000SQ/NOPB

    60.581
    LLP321260DetailDownloadN/A
    NS
    UZXYTT
    3000
    LM3000SQX/NOPB

    60.581
    LLP321260DetailDownloadN/A
    NS
    UZXYTT
    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 LM3000.

    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 LM3000 is located at RoHS Status.

    CAD Symbols and Models
    Download LM3000 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3000SQPVIP0500142800017550003497986041
    LM3000SQXPVIP0500142800017550003497986041

    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 LM3000.

    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 LM3000 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM3000ASQ
    LMK3000SQ
    NATIONAL SEMICONDUCTOR
    05 Nov 2010
    LM3000ASQX
    LM3000SQX
    NATIONAL SEMICONDUCTOR
    05 Oct 2010

    What's New in Power Management -- August 09
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    Factory Automation Solutions
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    What's New in Power Management -- August 09
    Date: 2009-08-21
    Length: 0:03:58
    Factory Automation Solutions
    Date: 2009-08-05
    Length: 0:05:17

    [Information as of 9-Feb-2012]