National Semiconductor | High-performance Analog

 

 LM20144   

4A, PowerWise Adjustable Frequency Synchronous Buck Regulator
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Features

  • Available in AEC-Q100 Temperature Grade 1
  • Input voltage range 2.95V to 5.5V
  • Accurate current limit minimizes inductor size
  • 97% peak efficiency
  • Adjustable switching frequency (500 kHz - 1.5 MHz)
  • 32 mΩ integrated FET switches
  • Starts up into pre-biased loads
  • Output voltage tracking
  • Peak current mode control
  • Adjustable output voltage down to 0.8V
  • Adjustable Soft-Start with external capacitor
  • Precision enable pin with hysteresis
  • Integrated OVP, UVLO, power good and thermal shutdown
  • eTSSOP-16 exposed pad package
  • Description

    The LM20144 is a full featured adjustable frequency synchronous buck regulator capable of delivering up to 4A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

    The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

    The LM20144 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20144 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

    The frequency of this device can be adjusted from 500 kHz to 1.5 MHz by connecting an external resistor from the RT pin to ground.

    The LM20144 is offered in a 16-pin eTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.


    Applications

  • Simple to design, high efficiency point of load regulation from a 5V or 3.3V bus
  • High Performance DSPs, FPGAs, ASICs and microprocessors
  • Broadband, Networking and Optical Communications Infrastructure
  • WEBENCH® LM20144
        Min   Max   Range  
      VIN V    2.95 – 5.50V  
      VOUT V    0.80 – 4.00V  
      IOUT A    ≤ 4.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM201233A, 1.5 MHz Switching Frequency
    LM201244A, 1 MHz Switching Frequency
    LM201255A, 500 KHz Switching Frequency
    LM201333A, Input Synchronization (500 KHz - 1.5 MHz)
    LM201344A, Input Synchronization (500 KHz - 1.5 MHz)
    LM201433A, Adjustable Frequency (500 KHz - 1.5 MHz)
    LM201455A, Adjustable Frequency (250 KHz - 750 KHz)
    LM201544A, SYNCOUT
    LM2024236V, 2A Adjustable Frequency (250 KHz - 750 KHz)



    Typical Application
    click for larger image


    Block Diagram
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    Block Diagram


    Typical Performance
    click for larger image


    Parameters / ValuesLM20144 LM20123 LM20124 LM20125 LM20133 LM20134 LM20143 LM20145 LM20154 LM20242
    Output Current4000 mA 3000 mA 4000 mA 5000 mA 3000 mA 4000 mA 3000 mA 5000 mA 4000 mA 2000 mA
    Input Min Voltage2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 2.95 Volt 4.5 Volt
    Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt 5.50 Volt 5.5 Volt 5.5 Volt 36 Volt
    Output Min0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.80 Volt 0.8 Volt 0.8 Volt 0.8 Volt
    Output Max5 Volt 5 Volt 5 Volt 5 Volt 5 Volt 5 Volt 5.00 Volt 5 Volt 5 Volt 32 Volt
    Frequency Min500 kHz Undefined kHz Undefined kHz Undefined kHz 460 kHz 460 kHz 510 kHz 250 kHz Undefined kHz 100 kHz
    Frequency Max1000 kHz Undefined kHz Undefined kHz Undefined kHz 1500 kHz 1500 kHz 1500 kHz 750 kHz Undefined kHz 1000 kHz
    Efficiency (peak)96 % 96 % 96 % 96 % 96 % 96 % 96 % 97 % 96 % 96 %
    Integrated InductorNo No No No No No No No No No
    PowerGood / Error FlagYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    SoftStartYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    Sync PinNo No No No Yes Yes No No No No
    InvertingUndefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined No
    FlybackUndefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined No
    RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    Adj Switch FrequencyYes No No No Yes Yes Yes Yes No Yes
    PWM ModeCurrent Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control Current Mode Control
    TopologySynchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck Synchronous Buck
    Special FeaturesUndefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Sync Output Undefined
    Step-DownYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    Multiple Output CapabilityNo No No No No No No No No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt Undefined Volt
    Output Range0.8V to 5.0V 0.8V to 5.0V 0.8V to 5.0V 0.8V to 5.0V 0.8V to 5.0V 0.8V to 5.0V 0.80V to 5.00V 0.8V to 5.0V 0.8V to 5.0V Undefined
    Switching FrequencyUndefined kHz 1500 kHz 1000 kHz 500 kHz 410 kHz 410 kHz Undefined kHz Undefined kHz 1000 kHz 1000 kHz
    Feedback Voltage0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt 0.8 Volt
    On/Off PinYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    Regulator FamilyLM20k LM20k LM20k LM20k LM20k LM20k LM20k LM20k LM20k LM20k
    AEC Q-100 Automotive Grade1 Undefined Undefined Undefined Undefined Undefined 1, 0 1 Undefined Undefined
    AutomotiveYes Yes, No Yes
    PowerWiseYes Yes Yes Yes Yes Yes Yes Yes Yes Yes
    Synchronous RectificationYes Yes Yes Yes Yes Yes Yes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM20144 4A, PowerWise Adjustable Frequency Synchronous Buck Regulator838
    Kbytes
    14-Nov-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1692: Application Note 1692 LM20144 Evaluation Board414
    Kbytes
    30-Oct-07日本語
    AN-1751: Application Note 1751 4A LM20k Reference Designs206
    Kbytes
    9-Nov-07 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM20144MH/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide78
    DIGI-KEYWorldwide282
    FARNELLEurope and Asia19
    MOUSERWorldwide276
    TECHMOSAAsia Pacific24
    $1.50 each at 1K+ pcsrail
    of
    92
    LM20144MHE/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    ARROWWorldwide1000
    DIGI-KEYWorldwide0
    TAYLORAmericas1000
    $1.50 each at 1K+ pcsreel
    of
    250
    LM20144MHX/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    TECHMOSAAsia Pacific2500
    $1.50 each at 1K+ pcsreel
    of
    2500
    LM20144QMH/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    $1.86 each at 1K+ pcsrail
    of
    92
    LM20144QMHE/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide250
    TAYLORAmericas250
    $1.86 each at 1K+ pcsreel
    of
    250
    LM20144QMHX/NOPB


    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    $1.86 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 LM20144.

    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 LM20144 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM20144EVAL
    4A, PowerWise® Adjustable Frequency Synchronous Buck RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $40.00 each1

    Features:

    • Input voltage range 2.95V to 5.5V
    • Accurate current limit minimizes inductor size
    • 97% peak efficiency
    • Adjustable switching frequency (500 kHz to 1.5 MHz)
    • 32 mΩ integrated FET switches
    • Starts into prebiased loads
    • Output voltage tracking
    • Peak current mode control
    • Adjustable output voltage down to 0.8V
    • Adjustable Soft-Start with external capacitor
    • Precision enable pin with hysteresis
    • Integrated OVP, UVLO, power good and thermal shutdown
    • eTSSOP-16 exposed pad package

    Applications:

    • Simple to design, high efficiency point of load regulation from a 5V or 3.3V bus
    • High Performance DSPs, FPGAs, ASICs and microprocessors
    • Broadband, Networking and Optical Communications Infrastructure

    Contents:

    • A LM20144 Fully Assembled Evaluation Board
    • A LM20144 Datasheet
    • A LM20144 Evaluation Board Appnote



    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
    LM20144MH/NOPB

    56.396
    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    MH
    LM20144MHE/NOPB

    56.396
    56.606
    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    MH
    LM20144MHX/NOPB

    56.396
    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    MH
    LM20144QMH/NOPB

    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    QMH
    LM20144QMHE/NOPB

    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    QMH
    LM20144QMHX/NOPB

    TSSOP EXP PAD161260DetailDownloadN/A
    NSUZXYTT
    20144
    QMH

    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 LM20144.

    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 LM20144 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM20144MHCMOS70213010015840003449464325
    LM20144MHECMOS70213010015840003449464325
    LM20144MHXCMOS70213010015840003449464325
    LM20144QMHCMOS70213010015840003449464325
    LM20144QMHECMOS70213010015840003449464325
    LM20144QMHXCMOS70213010015840003449464325

    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 LM20144.

    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 LM20144 is located at RoHS Status.

    [Information as of 6-Feb-2012]