National Semiconductor | High-performance Analog

 

 LM2731   
0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 		Click link to Download

Features

  • 22V DMOS FET switch
  • 1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency
  • Low RDS(ON) DMOS FET
  • Switch current up to 1.8A
  • Wide input voltage range (2.7V–14V)
  • Low shutdown current (<1 µA)
  • 5-Lead SOT-23 package
  • Uses tiny capacitors and inductors
  • Cycle-by-cycle current limiting
  • Internally compensated

    • Description

    The LM2731 switching regulators are current-mode boost converters operating at fixed frequencies of 1.6 MHz (“X” option) and 600 kHz (“Y” option).

    The use of SOT-23 package, made possible by the minimal power loss of the internal 1.8A switch, and use of small inductors and capacitors result in the industry's highest power density. The 22V internal switch makes these solutions perfect for boosting to voltages up to 20V.

    These parts have a logic-level shutdown pin that can be used to reduce quiescent current and extend battery life.

    Protection is provided through cycle-by-cycle current limiting and thermal shutdown. Internal compensation simplifies design and reduces component count.

    Switch Frequency

    X Y
    1.6 MHz 0.6 MHz


    Applications

  • White LED Current Source
  • PDA’s and Palm-Top Computers
  • Digital Cameras
  • Portable Phones and Games
  • Local Boost Regulator

    • WEBENCH® LM2731X
        Min   Max   Range  
      Vin V    2.70 – 14.00V  
      Vout V    1.23 – 22.00V  
      Iout A    ≤ 1.80A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
     
     
     
     
    What are WEBENCH® tools?

    Also Recommended
    LM2733▲Has A 40V / 1A Internal FET SOT-23 Package
    LM2735▲Increased Switch Current At 2.1A



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2731 LM2733 LM2735
    Output Range1.23V to 22V Vin to 40V Vin to 24
    Switch Current1.5 Amp 1 Amp 2.25 Amp
    Input Min Voltage2.7 Volt 2.7 Volt 2.7 Volt
    Input Max Voltage14 Volt 14 Volt 5.5 Volt
    Frequency Max600, 1600 kHz 600, 1600 kHz 1700, 550 kHz
    Output Min1.23 Volt 3 Volt 3 Volt
    Output Max22 Volt 40 Volt 24 Volt
    Efficiency (peak)90 % Undefined % 90 %
    Sync PinNo No No
    Adj Switch FrequencyNo No No
    Frequency Min600, 1600 kHz 600, 1600 kHz 475, 1500 kHz
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    Special FeaturesUndefined 12V LLP6 EXP DAP, LLP6 EXP DAP, eMSOP8 EXP DAP, SOT23-5, 12V eMSOP8 EXP DAP, 12V SOT23-5
    PWM ModeCurrent Current
    TopologyBoost Boost Boost, Sepic, FlyBack
    Step-UpYes Yes Yes
    InvertingNo No
    FlybackNo No Yes
    RegTypeSwitching Regulator Switching Regulator Switching Regulator
    Adjustable OutputYes Yes
    Output PowerUndefined Watt Undefined Watt
    Temperature Min-40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C
    AutomotiveYes Yes Yes
    PowerWiseNo No
    Quiescent Current2, 1 mA 1.1, 2.1 mA 7, 3.4 mA

    Datasheets
    TitleSizeDateOther
    Language
    LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23453
    Kbytes    		29-Apr-10日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1280: Application Note 1280 LM2731/LM2733 Evaluation Board2319
    Kbytes    		22-Nov-11 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2731XMF/NOPB

    LM2731XMF

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide3929
    DIGI-KEYWorldwide1389
    FARNELLEurope and Asia1620
    MOUSERWorldwide2281
    NEWARKAmericas1028
    RS COMPONENTSWorldwide157
    TAYLORAmericas3929
    		$1.08 each at 1K+ pcsreel
    of
    1000
    LM2731XMFX/NOPB

    LM2731XMFX

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AITGAsia Pacific1001
    DIGI-KEYWorldwide0
    		$1.08 each at 1K+ pcsreel
    of
    3000
    LM2731YMF/NOPB

    LM2731YMF

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1761
    AVNET-EMWorldwide13000
    BRITESTONESouth Korea2000
    CEACAsia Pacific10000
    DIGI-KEYWorldwide6403
    FARNELLEurope and Asia2015
    MOUSERWorldwide492
    NEWARKAmericas741
    RS COMPONENTSWorldwide55
    TAYLORAmericas21540
    TECHMOSAAsia Pacific5000
    		$1.08 each at 1K+ pcsreel
    of
    1000
    LM2731YMFX/NOPB

    LM2731YMFX

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3000
    DIGI-KEYWorldwide0
    TAYLORAmericas3000
    		$1.08 each at 1K+ pcsreel
    of
    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 LM2731.

    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 LM2731 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2731XEVAL/NOPB

    		0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23Full production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$30.00 each1

    Description:

    LM2731X 1.6 MHz Boost Converter With 22V Internal FET Switch

    Features:

    • 22 V DMOS FET switch
    • 1.6 MHz switching frequency
    • Low RDS(ON) DMOS FET
    • Switch current up to 1.8 A
    • Wide input voltage range (2.7 V-14 V)
    • Low shutdown current (<1 µA)
    • 5-lead SOT-23 package
    • Uses tiny capacitors and inductors
    • Cycle-by cycle current limiting
    • Internally compensated

    Applications:

    • White LED current source
    • PDA's and palm-top computers
    • Digital cameras
    • Portable phones and games
    • Local boost regulator

    Contents:

    • A fully assembled LM2731X evaluation board
    • LM2731 evaluation board appnote
    • LM2731 datasheet

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2731YEVAL/NOPB

    		0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23Full production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$30.00 each1

    Description:

    LM2731Y 0.6 MHz Boost Converter With 22 V Internal FET Switch

    Features:

    • 22 V DMOS FET switch
    • 0.6 MHz switching frequency
    • Low RDS(ON) DMOS FET
    • Switch current up to 1.8 A
    • Wide input voltage range (2.7 V-14 V)
    • Low shutdown current (<1 µA)
    • 5-lead SOT-23 package
    • Uses tiny capacitors and inductors
    • Cycle-by cycle current limiting
    • Internally compensated

    Applications:

    • White LED current source
    • PDA's and palm-top computers
    • Digital cameras
    • Portable phones and games
    • Local boost regulator

    Contents:

    • A fully assembled LM2731Y evaluation board
    • LM2731 evaluation board appnote
    • LM2731 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
    LM2731XMF/NOPB

    LM2731XMF
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		S51A
    XTT
    LM2731XMFX/NOPB

    LM2731XMFX
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		S51A
    XTT
    LM2731YMF/NOPB

    LM2731YMF
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		S51B
    XTT
    LM2731YMFX/NOPB

    LM2731YMFX
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		S51B
    XTT

    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 LM2731.

    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 LM2731 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - Methods and Features of LED Drivers  

    CAD Symbols and Models
    Download LM2731 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2731XMFABCD15004268000639400011814314958
    LM2731XMFXABCD15004268000639400011814314958
    LM2731YMFABCD15004268000639400011814314958
    LM2731YMFXABCD15004268000639400011814314958

    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 LM2731.

    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 LM2731 is located at RoHS Status.

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation