National Semiconductor | High-performance Analog

 

 LM3100   

SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage Regulator
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Features

  • Input voltage range 4.5V - 36V
  • 1.5A output current
  • 0.8V, ±1.5% reference
  • Integrated 40V, dual N-Channel buck synchronous switches
  • Low component count and small solution size
  • No loop compensation required
  • Ultra-fast transient response
  • Stable with ceramic and other low ESR capacitors
  • Programmable switching frequency up to 1MHz
  • Max. duty cycle limited during start-up
  • Valley current limit
  • Precision Internal Reference for adjustable output voltage down to 0.8V
  • Thermal shutdown
  • Thermally enhanced eTSSOP-20 package
  • Description

    The LM3100 Synchronously Rectified Buck Converter features all functions needed to implement a highly efficient, cost effective buck regulator capable of supplying 1.5A to loads with voltages as low as 0.8V. Dual 40V N-Channel synchronous MOSFET switches allow for low external component thus reducing complexity and minimizing board space. The LM3100 is designed to work exceptionally well with ceramic and other very low ESR output capacitors. The Constant ON-Time (COT) regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. Through the use of a unique design the regulator does not rely on output capacitor ESR for stability, as do most other COT regulators. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The oprating frequency can be externally programmed up to 1MHz. Protection features include VCC under-voltage lockout, thermal shutdown and gate drive under-voltage lockout. The part is available in a thermally enhanced eTSSOP-20 package

    WEBENCH® LM3100
        Min   Max   Range  
      VIN V    4.50 – 36.00V  
      VOUT V    0.80 – 7.00V  
      IOUT A    ≤ 1.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM2024236V, 2A PowerWise Step_Down Synchronous Switching Regulator
    LM3102Synchronous 1MHz 2.5A
    LM3103Synchronous 1MHz 0.75A
    LM500575V 2.5A Buck Regulator
    LM2592HV60V 2A Non-Synchronous Buck Regulator



    Parameters / ValuesLM3100 LM20242 LM3102 LM3103 LM5005 LM2592HV
    Output Current1500 mA 2000 mA 2500 mA 750 mA 2500 mA 2000 mA
    Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 7 Volt 4.5 Volt
    Input Max Voltage36 Volt 36 Volt 42 Volt 42 Volt 75 Volt 60 Volt
    Output Min0.8 Volt 0.8 Volt 0.8 Volt 0.6 Volt 1.23 Volt 3.3, 1.23, 5 Volt
    Output Max7 Volt 32 Volt 7 Volt 7 Volt 70 Volt 57, 3.3, 5 Volt
    Frequency MinUndefined kHz 100 kHz Undefined kHz Undefined kHz 50 kHz 150 kHz
    Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz 500 kHz 150 kHz
    Efficiency (peak)86 % 96 % 92 % 91 % 94 % 81, 75, 76 %
    Integrated InductorNo No No No
    PowerGood / Error FlagNo Yes No No No No
    SoftStartYes Yes Yes Yes Yes No
    Sync PinNo No No No Yes No
    InvertingNo No No No Yes No
    FlybackNo No Yes Yes No No
    RegTypeSwitching Regulator Switching 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 -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes Yes Yes Yes, No
    Adj Switch FrequencyYes Yes Yes Yes Yes No
    PWM ModeConstant On-time Current Mode Control Constant On-time Constant On-time Current Voltage
    TopologySynchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Buck Buck
    Special FeaturesVin feed forward and Current Injection compensation, SIMPLE SWITCHER synchronous regulator Undefined FCIC FCIC 1.5% feedback voltage accuracy, emulated current mode SIMPLE SWITCHER regulator
    Step-DownYes Yes Yes Yes Yes Yes
    Multiple Output CapabilityNo No No No No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt 3.3, Undefined, 5 Volt
    Output Range0.8V to 7V Undefined .8-7V .6-7V 1.23V to 70V 5V, 3.3V, 1.23V to 57V
    Switching Frequency1000 kHz 1000 kHz 1000 kHz 1000 kHz 500 kHz 150 kHz
    Feedback VoltageUndefined Volt 0.8 Volt Undefined Volt
    On/Off PinYes Yes Yes Yes Yes Yes
    Regulator FamilySIMPLE SWITCHER LM20k SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
    AutomotiveYes Yes Yes Yes
    PowerWiseYes Yes Yes Yes
    Synchronous RectificationYes Yes Yes Yes No No
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3100MH/NOPB

    LM3100MH

    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide177
    AVNET-EMWorldwide107
    DIGI-KEYWorldwide3763
    FARNELLEurope and Asia2199
    MOUSERWorldwide41
    NEWARKAmericas1112
    RS COMPONENTSWorldwide94
    TAYLORAmericas177
    $2.35 each at 1K+ pcsrail
    of
    73
    LM3100MHX/NOPB

    LM3100MHX

    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $2.35 each at 1K+ pcsreel
    of
    2500

    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 LM3100.

    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 LM3100 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3100EVAL
    SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage RegulatorFull production


     
    DistributorRegionQty
    AVNET-EMWorldwide5
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $77.00 each1

    LM3100 1.5A Simple Synchronous Buck Regulator

    Features:

    • Input voltage range 4.5V-36V
    • 1.5A output current
    • Integrated 40V, dual N-Channel buck synchronous switches
    • Low component count, all ceramic caps, small board space
    • No loop compensation required
    • Ultra-fast transient response
    • Stable with low ESR capacitors
    • Programmable switching frequency up to 1MHz
    • Max. duty cycle limited during start-up
    • Valley current limit at 1.8A
    • Thermal shutdown
    • Thermal enhanced eTSSOP-20 package

    Applications:

    • Notebooks
    • Point of Load Regulators
    • Storage Systems
    • Broadband Infrastructure
    • Industrial Controls

    Contents:

    • A fully assembled LM3100 evaluation board
    • LM3100 datasheet
    • LM3100 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
    LM3100MH/NOPB

    LM3100MH
    73.061
    73.592
    TSSOP EXP PAD201
    1
    260
    260
    DetailDownloadN/A
    NSUZXYTT
    LM3100
    MH
    LM3100MHX/NOPB

    LM3100MHX
    73.061
    73.592
    TSSOP EXP PAD201
    1
    260
    260
    DetailDownloadN/A
    NSUZXYTT
    LM3100
    MH

    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 LM3100.

    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 LM3100 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3100MHABCD15004268000639400011814314958
    LM3100MHXABCD15004268000639400011814314958

    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 LM3100.

    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 LM3100 is located at RoHS Status.

    PCB Layout Considerations for Switchers
    Click image to play video in new window


    PCB Layout Considerations for Switchers
    Date: 2008-07-17
    Length: 00:36:00
    [Information as of 7-Feb-2012]