National Semiconductor | High-performance Analog

 

 LM2704   

Micropower Step-up DC/DC Converter with 550mA Peak Current Limit
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Features
  • 550mA, 0.7, internal switch
  • Uses small surface mount components
  • Adjustable output voltage up to 20V
  • 2.2V to 7V input range
  • Input undervoltage lockout
  • 0.01µA shutdown current
  • Small 5-Lead SOT-23 package
  • Description

    The LM2704 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 21V switch allows for output voltages as high as 20V. 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 LM2704 is ideal for LCD panels requiring low current and high efficiency as well as white LED applications for cellular phone back-lighting. The LM2704 can drive up to 8 white LEDs from a single Li-Ion battery.


    Applications

  • LCD Bias Supplies
  • White LED Back-Lighting
  • Handheld Devices
  • Digital Cameras
  • Portable Applications
  • Also Recommended
    LM2623Operates With Input Voltages As Low As 0.8V
    LM27311.5A PWM Boost In SOT-23
    LM3500400Ma Synchronous Boost. No External Diode
    LM3503Soft Start, Over Voltage Protection On Output & Support For Single/dual Displays
    LM2703350mA Switch Current Limit



    Typical Application
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    Block Diagram
    *click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2704 LM3500 LM3503 LM2703
    Regulated LEDs4 4 10 4
    Total LED Current120 mA 70 mA 20 mA 60 mA
    Boost TypeInductive Inductive Inductive Inductive
    Efficiency (peak)80 % 85 % 80 %
    Input Min Voltage2.2 Volt 2.7 Volt 2.7 Volt 2.2 Volt
    Input Max Voltage7 Volt 7 Volt 5.5 Volt 7 Volt
    OutputMax Voltage20 Volt 21, 16 Volt 44 Volt 20 Volt
    Boost VoltageUnregulated Regulated Regulated Unregulated
    LED ConfigurationSeries Series Series Series
    Supply Current0.235 mA 1 mA 0.235 mA
    Switching TypePFM PWM Fixed Freq PFM
    PWM BrightCtrlYes Yes Yes Yes
    Analog-V BrightCtrlNo No Yes No
    Ambient Light CompensationNo No No
    RGB-LEDNo 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 WhiteLED Driver Switching Regulator
    PowerWiseNo No Yes No
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2704MF-ADJ/NOPB

    LM2704MF-ADJ

    RoHS Status


    SOT-23
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide818
    DIGI-KEYWorldwide3691
    FARNELLEurope and Asia2048
    NEWARKAmericas777
    RS COMPONENTSWorldwide136
    TAYLORAmericas818
    $0.73 each at 1K+ pcsreel
    of
    1000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2704-ADJ MDC
    NONE
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM2704-ADJ MWC
    NONE
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM2704MFX-ADJ
    NONE
    NATIONAL SEMICONDUCTOR
    01 Dec 2009

    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 LM2704.

    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 LM2704 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2704EV
    Micropower Step-up DC/DC Converter with 550mA Peak Current LimitFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide7
    MOUSERWorldwide2
    $39.00 each1

    Description:

    LM2704, Micropower Step-Up DC/DC Converter with 550mA Peak Current Limit

    Features:

    • 550mA, 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
    LM2704MF-ADJ/NOPB

    LM2704MF-ADJ
    14.696
    14.801
    SOT-2351
    1
    260
    260
    DetailDownloadN/A
    S28B
    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 LM2704.

    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 LM2704 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2704 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2704MF-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 LM2704.

    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 LM2704 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2704-ADJ MDC
    NONE
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM2704-ADJ MWC
    NONE
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM2704MFX-ADJ
    NONE
    NATIONAL SEMICONDUCTOR
    01 Dec 2009

    [Information as of 9-Feb-2012]