National Semiconductor | High-performance Analog

 

 LM27342   

2A - Wide Input Range Buck Regulator with Frequency Synchronization
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Features

  • Space saving 3 x 3 mm LLP-10 & eMSOP-10 package
  • Wide input voltage range   3V to 20V
  • Wide output voltage range  1V to 18V
  • LM27341 delivers 1.5A maximum output current
  • LM27342 delivers 2A maximum output current
  • High switching frequency   2 MHz
  • Frequency synchronization  1.00 MHz < fSW < 2.35 MHz
  • 150 mΩ NMOS switch with internal bootstrap supply
  • 70 nA shutdown current
  • Internal voltage reference accuracy of 1%
  • Peak Current-Mode, PWM operation
  • Thermal shutdown
  • LM27341Q and LM27342Q are AEC-Q100 Grade 1 qualified and are manufactured on an Automotive Grade Flow
  • Description

    The LM27341 and LM27342 regulators are monolithic, high frequency, PWM step-down DC-DC converters in 10-pin LLP and 10-pin eMSOP packages. They contain all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

    With a minimum of external components the LM27341 and LM27342 are easy to use. The ability to drive 1.5A or 2A loads respectively, with an internal 150 mΩ NMOS switch results in the best power density available. The world-class control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included featuring an ultra-low shutdown current of 70 nA. The LM27341and LM27342 utilize peak current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.


    Applications

  • Local 12V to Vcore Step-Down Converters
  • Radio Power Supply
  • Core Power in HDDs
  • Set-Top Boxes
  • Automotive
  • USB Powered Devices
  • DSL Modems
  • Also Recommended
    LM273411.5A Version
    LM27381.5A Version, No Frequency Sync


    Typical Application

    Parameters / ValuesLM27342 LM27341 LM2738
    Output Current2000 mA 1500 mA 1500 mA
    Input Min Voltage3 Volt 3 Volt 3 Volt
    Input Max Voltage20 Volt 20 Volt 20 Volt
    Output Min1 Volt 1 Volt 0.8 Volt
    Output Max18 Volt 18 Volt 18 Volt
    Frequency Min1000 kHz 1000 kHz 364, 1280 kHz
    Frequency Max2350 kHz 2350 kHz 1920, 676 kHz
    Efficiency (peak)93 % 93 % 94.5, 92 %
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    SoftStartYes Yes Yes
    Sync PinYes Yes No
    InvertingNo No No
    FlybackNo No No
    RegTypeSwitching Regulator Switching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes
    Adj Switch FrequencyYes Yes No
    PWM ModeCurrent Current Current
    TopologyNon-Synchronous Buck Regulator Non-Synchronous Buck Regulator Buck
    Special FeaturesOVP, internal compensation, 70nA shutdown current, pulse-by-pulse current limit OVP, internal compensation, 70nA shutdown current, pulse-by-pulse current limit
    Step-DownYes Yes Yes
    Multiple Output CapabilityNo No No
    Output Range1.0 - 18V 1.0 - 18V
    Switching Frequency2000 kHz 2000 kHz 1600, 550 kHz
    Feedback Voltage1 Volt 1 Volt 0.8 Volt
    AEC Q-100 Automotive Grade1 1
    AutomotiveYes Yes
    PowerWiseNo No
    Synchronous RectificationNo No No
    Quiescent Current2.4 mA 2.4 mA
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM27342MY/NOPB


    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 12 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1201
    MOUSERWorldwide1000
    NEWARKAmericas668
    $1.45 each at 1K+ pcsreel
    of
    1000
    LM27342MYX/NOPB


    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.45 each at 1K+ pcsreel
    of
    3500
    LM27342QMY/NOPB

    Auto Grade 1
    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide1741
    MOUSERWorldwide1000
    $1.70 each at 1K+ pcsreel
    of
    1000
    LM27342QMYX/NOPB

    Auto Grade 1
    RoHS Status


    MINI SOIC EXP PAD
    Full production
    Lead Time: 12 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.70 each at 1K+ pcsreel
    of
    3500
    LM27342SD/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1936
    FARNELLEurope and Asia500
    MOUSERWorldwide1000
    NEWARKAmericas496
    $1.45 each at 1K+ pcsreel
    of
    1000
    LM27342SDX/NOPB


    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.45 each at 1K+ pcsreel
    of
    4500

    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 LM27342.

    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 LM27342 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM27342MYEVAL
    LM27342MY (10-Pin eMSOP Package) - 2MHz 2A Wide Input Range Step-Down DC-DC Regulator with Frequency SynchronizationFull production


     
    DistributorRegionQty
    FARNELLEurope and Asia4
    MOUSERWorldwide2
    NEWARKAmericas4
    $50.00 each1

    Description:

    The LM27342 demonstration board is designed to provide the power supply design engineer with a fully functional regulator design which can be synchronized to an external clock between 1000 kHz and 2350 kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. There is a ground plane on the internal layer directly beneath the LM27342.and a ground plane on the bottom layer. The LM27342 is thermally tied to the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to VIN and half to VOUT.

    Features:

    • Input Range: 5 to 20V
    • Output Voltage: 3.3V
    • Output Current: 0 to 2A
    • Frequency of Operation: 1000 kHz - 2350 kHz
    • Board Size: 1.1 X 1.3 inches

    Contents:


    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM27342SDEVAL
    LM27342 (10-Pin LLP Package) - 2MHz 2A Wide Input Range Step-Down DC-DC Regulator with Frequency SynchronizationFull production


     
    DistributorRegionQty
    FARNELLEurope and Asia3
    NEWARKAmericas3
    $50.00 each1

    General Description:

    The LM27342 demonstration board is designed to provide the power supply design engineer with a fully functional regulator design which can be synchronized to an external clock between 1000 kHz and 2350 kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. There is a ground plane on the internal layer directly beneath the LM27342.and a ground plane on the bottom layer. The LM27342 is thermally tied to the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to VIN and half to VOUT.

    Features:

    • Input Range: 5 to 20V
    • Output Voltage: 3.3V
    • Output Current: 0 to 2A
    • Frequency of Operation: 1000 kHz - 2350 kHz
    • Board Size: 1.1 X 1.3 inches

    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
    LM27342MY/NOPB

    30.155
    MINI SOIC EXP PAD103260DetailDownloadN/A
    ZXTT
    SSCA
    LM27342MYX/NOPB

    30.155
    MINI SOIC EXP PAD103260DetailDownloadN/A
    ZXTT
    SSCA
    LM27342QMY/NOPB

    30.155
    MINI SOIC EXP PAD103260DetailDownloadN/A
    ZXTT
    SSJA
    LM27342QMYX/NOPB

    30.155
    MINI SOIC EXP PAD103260DetailDownloadN/A
    ZXTT
    SSJA
    LM27342SD/NOPB

    21.112
    LLP101260DetailDownloadN/A
    ZXYTT
    L231A
    LM27342SDX/NOPB

    21.112
    LLP101260DetailDownloadN/A
    ZXYTT
    L231A

    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 LM27342.

    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 LM27342 is located at RoHS Status.

    CAD Symbols and Models
    Download LM27342 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM27342MYPVIP0500142800017550003497986041
    LM27342MYXPVIP0500142800017550003497986041
    LM27342QMYPVIP0500142800017550003497986041
    LM27342QMYXPVIP0500142800017550003497986041
    LM27342SDPVIP0500142800017550003497986041
    LM27342SDXPVIP0500142800017550003497986041

    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 LM27342.

    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 LM27342 is located at RoHS Status.

    What's New in Power -- January 2009
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    What's New in Power Management -- November 09
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    Power for Space-Constrained Applications
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    Power for Space-Constrained Applications
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    What's New in Power -- January 2009
    Date: 2009-01-19
    Length: 0:04:57
    What's New in Power Management -- November 09
    Date: 2009-12-07
    Length: 0:05:03
    Power for Space-Constrained Applications
    Date: 2009-04-22
    Length: 0:03:35
    Power for Space-Constrained Applications
    Date: 2009-04-22
    Length: 00:45:00
    [Information as of 9-Feb-2012]