National Semiconductor | High-performance Analog

 

 LM3102   

SIMPLE SWITCHER Synchronous 1MHz 2.5A Step-Down Voltage Regulator
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Features

  • LM3102Q is an automotive grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
  • Low component count and small solution size
  • Stable with ceramic and other low ESR capacitors
  • No loop compensation required
  • High efficiency at a light load by DCM operation
  • Pre-bias startup
  • Ultra-fast transient response
  • Programmable soft-start
  • Programmable switching frequency up to 1 MHz
  • Valley current limit
  • Output over-voltage protection
  • Precision internal reference for an adjustable output voltage down to 0.8V
  • Thermal shutdown
  • Description

    The LM3102 Synchronously Rectified Buck Converter features all required functions to implement a highly efficient and cost effective buck regulator. It is capable of supplying 2.5A to loads with an output voltage as low as 0.8V. Dual N-Channel synchronous MOSFET switches allow a low component count, thus reducing complexity and minimizing board size.

    Different from most other COT regulators, the LM3102 does not rely on output capacitor ESR for stability, and is designed to work exceptionally well with ceramic and other very low ESR output capacitors. It requires no loop compensation, results in a fast load transient response and simple circuit implementation. The operating frequency remains nearly constant with line variations due to the inverse relationship between the input voltage and the on-time. The operating frequency can be externally programmed up to 1 MHz. Protection features include VCC under-voltage lock-out, output over-voltage protection, thermal shutdown, and gate drive under-voltage lock-out. The LM3102 is available in the thermally enhanced eTSSOP-20 package as well as a uSMD low profile chip-scale package with reduced output current.

    Key Specification

  • Input voltage range 4.5V-42V
  • 2.5A output current
  • 0.8V, ±1.5% reference
  • Integrated dual N-Channel main and synchronous MOSFETs
  • Thermally enhanced eTSSOP-20 package
  • WEBENCH® LM3102
        Min   Max   Range  
      VIN V    4.50 – 42.00V  
      VOUT V    0.80 – 7.00V  
      IOUT A    ≤ 2.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM2024236V, 2A PowerWise Step-Down Synchronous Switching Regulator
    LM21305LLP-28 Package, 5A Output Current
    LM3100Synchronous 1MHz 1.5A
    LM3103Synchronous 1MHz 0.75A



    Typical Application
    click for larger image


    Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM3102 LM20242 LM21305 LM3100 LM3103
    Output Current2500 mA 2000 mA 5000 mA 1500 mA 750 mA
    Input Min Voltage4.5 Volt 4.5 Volt 3 Volt 4.5 Volt 4.5 Volt
    Input Max Voltage42 Volt 36 Volt 18 Volt 36 Volt 42 Volt
    Output Min0.8 Volt 0.8 Volt 0.6 Volt 0.8 Volt 0.6 Volt
    Output Max7 Volt 32 Volt 5 Volt 7 Volt 7 Volt
    Frequency MinUndefined kHz 100 kHz 300 kHz Undefined kHz Undefined kHz
    Frequency Max1000 kHz 1000 kHz 1500 kHz 1000 kHz 1000 kHz
    Efficiency (peak)92 % 96 % 95 % 86 % 91 %
    Integrated InductorNo No No No No
    PowerGood / Error FlagNo Yes Yes No No
    SoftStartYes Yes Yes Yes Yes
    Sync PinNo No Yes No No
    InvertingNo No No No No
    FlybackYes No No No Yes
    RegTypeSwitching Regulator 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
    Temperature Max125 deg C 125 deg C 85 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes Yes Yes
    Adj Switch FrequencyYes Yes Yes Yes Yes
    PWM ModeConstant On-time Current Mode Control Current Mode Control Constant On-time Constant On-time
    TopologySynchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck
    Special FeaturesFCIC Undefined Vin feed forward and Current Injection compensation, SIMPLE SWITCHER synchronous regulator FCIC
    Step-DownYes Yes Yes Yes Yes
    Multiple Output CapabilityNo No No No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt
    Output Range.8-7V Undefined 0.6V to 5V 0.8V to 7V .6-7V
    Switching Frequency1000 kHz 1000 kHz 300 kHz 1000 kHz 1000 kHz
    On/Off PinYes Yes Yes Yes Yes
    Regulator FamilySIMPLE SWITCHER LM20k LM20k SIMPLE SWITCHER SIMPLE SWITCHER
    AutomotiveYes No Yes Yes
    PowerWiseYes Yes Yes Yes Yes
    Synchronous RectificationYes Yes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3102/LM3102Q SIMPLE SWITCHER Synchronous 1MHz 2.5A Step-Down Voltage Regulator403
    Kbytes
    18-Jan-12日本語
    中文


    Application Notes
    TitleSizeDateOther
    Language
    AN-1646: Application Note 1646 LM3102 Demonstration Board Reference Design216
    Kbytes
    2-Oct-07 中文


    Other Technical Documents
    TitleTypeDate
    Tip of the Week: How to best implement a synchronous buck converterExternal Article 2008-04-26
    Emulated Ripple Makes Step-Down Conversion EasyExternal Article 2008-08-01

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3102MH/NOPB

    LM3102MH

    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide169
    AVNET-EMWorldwide241
    DIGI-KEYWorldwide2697
    FARNELLEurope and Asia2108
    MOUSERWorldwide295
    NEWARKAmericas1166
    RS COMPONENTSWorldwide67
    TAYLORAmericas169
    $2.59 each at 1K+ pcsrail
    of
    73
    LM3102MHX/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide7832
    DIGI-KEYWorldwide0
    TAYLORAmericas7832
    $2.59 each at 1K+ pcsreel
    of
    2500
    LM3102QMH/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples

    Contact your distributor
    $2.89 each at 1K+ pcsrail
    of
    73
    LM3102QMHX/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    $2.89 each at 1K+ pcsreel
    of
    2500
    LM3102TL-1/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide461
    MOUSERWorldwide250
    $2.39 each at 1K+ pcsreel
    of
    250
    LM3102TLX-1/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    $2.39 each at 1K+ pcsreel
    of
    1000

    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 LM3102.

    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 LM3102 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3102EVAL/NOPB

    SIMPLE SWITCHER® Synchronous 1MHz 2.5A Step-Down Voltage RegulatorFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    AVNET-EMWorldwide7
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $46.20 each1

    Description:

    • Low component count and small solution size
    • Stable with ceramic and other low ESR capacitors
    • No loop compensation required
    • High efficiency at a light load by DCM operation
    • Pre-bias startup
    • Ultra-fast transient response
    • Programmable soft-start
    • Programmable switching frequency up to 1 MHz
    • Valley current limit
    • Output over-voltage protection
    • Precision internal reference for an adjustable output voltage down to 0.8V
    • Thermal shutdown

    Features:

    • Input voltage range of 4.5V -42V
    • 2..5A output current
    • 0.8V, ±1.5% reference
    • Integrated dual N-Channel main and synchronous MOSFETs
    • Thermally enhanced eTSSOP-20 package

    Applications:

    • 5VDC, 12VDC, 24VDC, 12VAC, and 24VAC systems
    • Embedded Systems
    • Industrial Control
    • Automotive Telematics and Body Electronics
    • Point of Load Regulators
    • Storage Systems
    • Broadband Infrastructure
    • Direct Conversion from 2/3/4 Cell Lithium Batteries Systems

    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
    LM3102MH/NOPB

    LM3102MH
    73.061
    TSSOP EXP PAD201
    1
    260
    260
    DetailDownloadN/A
    NSUZXYTT
    LM3102
    MH
    LM3102MHX/NOPB

    73.061
    TSSOP EXP PAD201260DetailDownloadN/A
    NSUZXYTT
    LM3102
    MH
    LM3102QMH/NOPB

    TSSOP EXP PAD201260DetailDownloadN/A
    NSUZXYTT
    LM3102
    QMH
    LM3102QMHX/NOPB

    TSSOP EXP PAD201260DetailDownloadN/A
    NSUZXYTT
    LM3102
    QMH
    LM3102TL-1/NOPB

    10.14
    MICRO SMD281260DetailDownloadN/A
    XYTT
    I 3102
    LM3102TLX-1/NOPB

    10.14
    MICRO SMD281260DetailDownloadN/A
    XYTT
    I 3102

    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 LM3102.

    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 LM3102 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3102MHABCD15004268000639400011814314958
    LM3102MHXABCD15004268000639400011814314958
    LM3102QMHABCD15004268000639400011814314958
    LM3102QMHXABCD15004268000639400011814314958
    LM3102TL-1ABCD15004268000639400011814314958
    LM3102TLX-1ABCD15004268000639400011814314958

    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 LM3102.

    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 LM3102 is located at RoHS Status.

    [Information as of 8-Feb-2012]