National Semiconductor | High-performance Analog

 

 LM2717-ADJ   

Dual Step-Down DC/DC Converter
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Features

  • Adjustable buck converter with a 2.2A, 0.16Ω, internal switch (Buck 1)
  • Adjustable buck converter with a 3.2A, 0.16Ω, internal switch (Buck 2)
  • Operating input voltage range of 4V to 20V
  • Input undervoltage protection
  • 300kHz to 600kHz pin adjustable operating frequency
  • Over temperature protection
  • Small 24-Lead TSSOP package
  • Description

    The LM2717-ADJ is composed of two PWM DC/DC buck (step-down) converters. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both also feature low RDSON (0.16Ω) internal switches for maximum efficiency. Operating frequency can be adjusted anywhere between 300kHz and 600kHz allowing the use of small external components. External soft-start pins for each converter enables the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2717-ADJ is available in a low profile 24-lead TSSOP package ensuring a low profile overall solution.


    Applications

  • TFT-LCD Displays
  • Handheld Devices
  • Portable Applications
  • Laptop Computers
  • Automotive Applications
  • Also Recommended
    LM26400YVin Down To 3V, Vout Down To 0.6V, Dual 2A ADJ Outputs
    LM2717For A Fixed 3.3V Output Version



    Typical Application
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    Block Diagram
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    Typical Performance
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    Parameters / ValuesLM2717-ADJ LM26400Y LM2717
    Channels2 Channels 2 Channels 2 Channels
    Output Range1.265V-18V 0.6 to 16V 1.265V-18V
    Output1 TopologyBuck Buck Buck
    Output2 TopologyBuck Buck Buck
    Input Min Voltage4 Volt 3 Volt 4 Volt
    Input Max Voltage20 Volt 20 Volt 20 Volt
    Frequency Min300 kHz 520 kHz 300 kHz
    Frequency Max600 kHz 520 kHz 600 kHz
    Efficiency (peak)90 % 90 %
    Adj Switch FrequencyYes No Yes
    Output1 VoutMin1.267 Volt 0.6 Volt 3.3 Volt
    Output1 VoutMax18 Volt 16 Volt 3.3 Volt
    Output1 IoutMax2200 mA 2000 mA 2200 mA
    Output2 VoutMin1.267 Volt 0.6 Volt 1.267 Volt
    Output2 VoutMax18 Volt 16 Volt 18 Volt
    Output2 IoutMax3600 mA 2000 mA 3200 mA
    Sync PinNo No No
    MOSFET Rdson0.16ohm 175 mohm 0.16ohm
    SoftStartYes Yes Yes
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    Special FeaturesSee LM2717 for similar product with 1 fixed output, 1 adjustable output See LM2717-ADJ for similar product with 2 adjustable outputs
    TopologyDual Buck peak-current mode Dual Buck
    RegTypeSwitching Regulator Switching Regulator Switching Regulator
    Step-DownYes Yes Yes
    Step-UpNo No No
    InvertingNo No No
    FlybackNo No No
    Switching Frequency600 kHz 520 kHz 600 kHz
    Multiple Output CapabilityYes Yes Yes
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LM2717-ADJ Dual Step-Down DC/DC Converter397
    Kbytes
    4-Mar-08   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1456: Application Note 1456 LM2717-ADJ Evaluation Board425
    Kbytes
    10-May-06 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2717MT-ADJ/NOPB

    LM2717MT-ADJ

    RoHS Status


    TSSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide54
    AVNET-EMWorldwide195
    DIGI-KEYWorldwide939
    FARNELLEurope and Asia127
    NEWARKAmericas90
    RS COMPONENTSWorldwide18
    TAYLORAmericas54
    $2.60 each at 1K+ pcsrail
    of
    61
    LM2717MTX-ADJ/NOPB

    LM2717MTX-ADJ

    RoHS Status


    TSSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $2.60 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 LM2717-ADJ.

    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 LM2717-ADJ is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2717MT-ADJEV
    Dual Step-Down DC/DC ConverterFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $115.00 each1

    Description:

    The LM2717MT-ADJ is composed of two PWM DC/DC buck (step-down)converters. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both also feature low RDSON (0.16ohm) internal switches for maximum efficiency. Operating frequency can be adjusted anywhere between 300kHz and 600kHz allowing the use of small external components. External soft-start pins for each converter enables the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2717-ADJ is available in a low profile 24-lead TSSOP package ensuring a low profile overall solution.

    Features:

    • Adjustable buck converter with a 2.2A, 0.16 ohm, internal switch (Buck 1)
    • Adjustable buck converter with a 3.2A, 0.16 ohm, internal switch (Buck 2)
    • Operating input voltage range of 4V to 20V
    • Input undervoltage protection
    • 300kHz to 600kHz pin adjustable operating frequency
    • Over temperature protection
    • Small 24-Lead TSSOP package

    Applications:

    • TFT-LCD Displays
    • Handheld Devices
    • Portable Applications
    • Laptop Computers
    • Automotive 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
    LM2717MT-ADJ/NOPB

    LM2717MT-ADJ
    83.622
    84.002
    TSSOP241
    1
    260
    260
    DetailN/AN/A
    NSUZXYTTE#
    LM2717
    MT-ADJ
    LM2717MTX-ADJ/NOPB

    LM2717MTX-ADJ
    83.622
    84.002
    TSSOP241
    1
    260
    260
    DetailN/AN/A
    NSUZXYTTE#
    LM2717
    MT-ADJ

    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 LM2717-ADJ.

    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 LM2717-ADJ is located at RoHS Status.

    CAD Symbols and Models
    N/A
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2717MT-ADJABCD15004268000639400011814314958
    LM2717MTX-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 LM2717-ADJ.

    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 LM2717-ADJ is located at RoHS Status.

    [Information as of 9-Feb-2012]