National Semiconductor | High-performance Analog

 

 LM2703   

Micropower Step-Up DC/DC Converter with 350mA Peak Current Limit
Click link to Download

Features
  • 350mA, 0.7, internal switch
  • Uses small surface mount components
  • Adjustable output voltage up to 21V
  • 2.2V to 7V input range
  • Input undervoltage lockout
  • 0.01µA shutdown current
  • Small 5-Lead SOT-23 package
  • Description

    The LM2703 is a micropower step-up DC/DC in a small 5-lead SOT-23 package. A current limited, fixed off-time control scheme conserves operating current resulting in high efficiency over a wide range of load conditions. The 22V switch allows for output voltages as high as 21V. The low 400ns off-time permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. The LM2703 is ideal for LCD panels requiring low current and high efficiency as well as white LED applications for cellular phone back-lighting. The LM2703 can drive up to 4 white LEDs from a single Li-Ion battery.


    Applications

  • LCD Bias Supplies
  • White LED Back-Lighting
  • Handheld Devices
  • Digital Cameras
  • Portable Applications
  • Also Recommended
    LM27311.5A Switch In SOT-23. PWM
    LM3500Sync Rectification (No External Diode)
    LM2704Higher (550mA) Switch Current Limit
    LM2705150mA Switch Current Limit



    Typical Application
    click for larger image


    Block Diagram
    *click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2703 LM3500 LM2704 LM2705
    Regulated LEDs4 4 4 3
    Total LED Current60 mA 70 mA 120 mA 40 mA
    Boost TypeInductive Inductive Inductive Inductive
    Efficiency (peak)80 % 85 % 80 % 80 %
    Input Min Voltage2.2 Volt 2.7 Volt 2.2 Volt 2.2 Volt
    Input Max Voltage7 Volt 7 Volt 7 Volt 7 Volt
    OutputMax Voltage20 Volt 21, 16 Volt 20 Volt 20 Volt
    Boost VoltageUnregulated Regulated Unregulated Unregulated
    LED ConfigurationSeries Series Series Series
    Supply Current0.235 mA 1 mA 0.235 mA 0.235 mA
    Switching TypePFM PWM PFM PFM
    PWM BrightCtrlYes Yes Yes Yes
    Analog-V BrightCtrlNo No No No
    Ambient Light CompensationNo No No No
    RGB-LEDNo No No No
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max85 deg C 85 deg C 85 deg C 85 deg C
    RegTypeSwitching Regulator WhiteLED Driver Switching Regulator Switching Regulator
    PowerWiseNo No No No

    Datasheets
    TitleSizeDateOther
    Language
    LM2703 Micropower Step-Up DC/DC Converter with 350mA Peak Current Limit694
    Kbytes
    21-Jun-06日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1277: Application Note 1277 LM2703/LM2704 Evaluation Board26
    Kbytes
    6-Mar-03 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2703MF-ADJ/NOPB

    LM2703MF-ADJ

    RoHS Status


    SOT-23
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1950
    AVNET-EMWorldwide953
    DIGI-KEYWorldwide3695
    FARNELLEurope and Asia1604
    MOUSERWorldwide775
    NEWARKAmericas189
    RS COMPONENTSWorldwide420
    TAYLORAmericas4950
    TECHMOSAAsia Pacific1000
    $0.75 each at 1K+ pcsreel
    of
    1000
    LM2703MFX-ADJ/NOPB

    LM2703MFX-ADJ

    RoHS Status


    SOT-23
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $0.75 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 LM2703.

    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 LM2703 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2703EV
    Micropower Step-Up DC/DC Converter with 350mA Peak Current LimitFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $39.00 each1

    Description:

    LM2703, Micropower Step-Up DC/DC Converter with 350mA Peak Current Limit

    Features:

    • 350mA, 0.7 Ohm, internal switch
    • Uses small surface mount components
    • Adjustable output voltage up to 20V
    • 2.2V to 7V input range
    • Input undervoltage lockout
    • 0.01 microA shutdown current
    • Small 5-lead SOT-23 package

    Applications:

    • LCD Bias Supplies
    • White LED Back-Lighting
    • Handheld Devices
    • Digital Cameras
    • Portable Applications



    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
    LM2703MF-ADJ/NOPB

    LM2703MF-ADJ
    14.696
    14.801
    SOT-2351
    1
    260
    260
    DetailDownloadN/A
    S48B
    XTT
    LM2703MFX-ADJ/NOPB

    LM2703MFX-ADJ
    14.696
    14.801
    SOT-2351
    1
    260
    260
    DetailDownloadN/A
    S48B
    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 LM2703.

    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 LM2703 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2703 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2703MF-ADJABCD15004268000639400011814314958
    LM2703MFX-ADJABCD15004268000639400011814314958

    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 LM2703.

    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 LM2703 is located at RoHS Status.

    [Information as of 9-Feb-2012]