National Semiconductor | High-performance Analog

 

 LM3103   
SIMPLE SWITCHER® Synchronous 1MHz 0.75A Step-Down Voltage Regulator 		Click link to Download

Features

  • 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
  • Thermal shutdown
  • Output over-voltage protection
  • Precision internal reference for an adjustable output voltage down to 0.6V

    • Description

    The LM3103 Synchronously Rectified Buck Converter features all required functions to implement a highly efficient and cost effective buck regulator. It is capable of supplying 0.75A to loads with an output voltage as low as 0.6V. 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 LM3103 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 LM3103 is available in the thermally enhanced eTSSOP-16 package.

    Key Specification

  • Input voltage range 4.5V-42V
  • 0.75A output current
  • 0.6V, ±2% reference
  • Integrated dual N-Channel main and synchronous MOSFETs
  • Thermally enhanced eTSSOP-16 package

    • WEBENCH® LM3103
        Min   Max   Range  
      VIN – V    4.50 – 42.00V  
      VOUT V    0.60 – 7.00V  
      IOUT A    ≤ 0.75A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM20242▲36V, 2A PowerWise Step_Down Synchronous Switching Regulator
    LM3100▲Synchronous 1MHz 1.5A
    LM3102▲Synchronous 1MHz 2.5A



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM3103 LM20242 LM3100 LM3102
    Output Current750 mA 2000 mA 1500 mA 2500 mA
    Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt
    Input Max Voltage42 Volt 36 Volt 36 Volt 42 Volt
    Output Min0.6 Volt 0.8 Volt 0.8 Volt 0.8 Volt
    Output Max7 Volt 32 Volt 7 Volt 7 Volt
    Frequency MinUndefined kHz 100 kHz Undefined kHz Undefined kHz
    Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz
    Efficiency (peak)91 % 96 % 86 % 92 %
    Integrated InductorNo No No No
    PowerGood / Error FlagNo Yes No No
    SoftStartYes Yes Yes Yes
    Sync PinNo No No No
    InvertingNo No No No
    FlybackYes No No Yes
    RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator
    Temperature Min-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
    Adjustable OutputYes Yes Yes Yes
    Adj Switch FrequencyYes Yes Yes Yes
    PWM ModeConstant On-time Current Mode Control Constant On-time Constant On-time
    TopologySynchronous 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
    Multiple Output CapabilityNo No No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt
    Output Range.6-7V Undefined 0.8V to 7V .8-7V
    Switching Frequency1000 kHz 1000 kHz 1000 kHz 1000 kHz
    On/Off PinYes Yes Yes Yes
    Regulator FamilySIMPLE SWITCHER LM20k SIMPLE SWITCHER SIMPLE SWITCHER
    AutomotiveYes Yes Yes
    PowerWiseYes Yes Yes Yes
    Synchronous RectificationYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3103 SIMPLE SWITCHER® Synchronous 1MHz 0.75A Step-Down Voltage Regulator393
    Kbytes    		30-Nov-09日本語
    中文


    Application Notes
    TitleSizeDateOther
    Language
    AN-1678: Application Note 1678 LM3103 Demonstration Board Reference Design217
    Kbytes    		2-Oct-07 


    Other Technical Documents
    TitleTypeDate
    Single-stage synchronous buck converter with high efficiencyExternal Article 2008-05-02
    Emulated Ripple Makes Step-Down Conversion EasyExternal Article 2008-08-01

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3103MH/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1411
    DIGI-KEYWorldwide1450
    FARNELLEurope and Asia1846
    MOUSERWorldwide1004
    NEWARKAmericas1496
    RS COMPONENTSWorldwide15
    TAYLORAmericas1411
    		$1.80 each at 1K+ pcsrail
    of
    92
    LM3103MHX/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide2095
    AVNET-EMWorldwide7500
    DIGI-KEYWorldwide0
    TAYLORAmericas2095
    		$1.80 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 LM3103.

    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 LM3103 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3103EVAL
    		SIMPLE SWITCHER® Synchronous 1MHz 0.75A Step-Down Voltage RegulatorFull production


     
    DistributorRegionQty
    AVNET-EMWorldwide8
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$41.90 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
    • Thermal shutdown
    • Output over-voltage protection
    • Precision internal reference for an adjustable output voltage down to 0.6V

    Features:

    • Input voltage range of 4.5V -42V
    • 0.75A output current
    • 0.6V, ±2% reference
    • Integrated dual N-Channel main and synchronous MOSFETs
    • Thermally enhanced eTSSOP-16 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
    LM3103MH/NOPB

    		56.396
    56.606
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    LM3103
    MH
    LM3103MHX/NOPB

    		56.396
    56.606
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    LM3103
    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 LM3103.

    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 LM3103 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3103MHABCD15004268000639400011814314958
    LM3103MHXABCD15004268000639400011814314958

    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 LM3103.

    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 LM3103 is located at RoHS Status.

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