National Semiconductor | High-performance Analog

 

 LM22678   

5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Precision Enable
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Features

  • Wide input voltage range: 4.5V to 42V
  • Internally compensated voltage mode control
  • Stable with low ESR ceramic capacitors
  • 100 mΩ N-channel MOSFET
  • Output voltage options:

  •  -ADJ (outputs as low as 1.285V)

  •  -5.0 (output fixed to 5V)
  • ±1.5% feedback reference accuracy
  • Switching frequency of 500 kHz
  • -40°C to 125°C operating junction temperature range
  • Precision enable pin
  • Integrated boot diode
  • Integrated soft-start
  • Fully WEBENCH ® enabled
  • Step-down and inverting buck-boost applications
  • LM22678Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
  • Description

    The LM22678 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.

    The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH ® design tool. National’s WEBENCH ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The LM22678 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition.


    Applications

  • Industrial Control
  • Telecom and Datacom Systems
  • Embedded Systems
  • Automotive Telematics and Body Electronics
  • Conversions from Standard 24V, 12V and 5V Input Rails
  • WEBENCH® LM22678
        Min   Max   Range  
      VIN V    4.50 – 42.00V  
      VOUT V    1.28 – 37.00V  
      IOUT A    ≤ 5.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM226740.5A Version
    LM226751A Version
    LM226763A Version
    LM22677Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
    LM22679Features Adjustable Soft-Start And Adjustable Current Limit
    LM226802A Version
    LM3150Synchronous Simple Switcher Controller For Higher Efficiency



    Typical Application
    click for larger image


    Connection Diagram
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    Typical Performance
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    Parameters / ValuesLM22678 LM22674 LM22675 LM22676 LM22677 LM22679 LM22680 LM3150
    Output Current5000 mA 500 mA 1000 mA 3000 mA 5000 mA 5000 mA 2000 mA 12000 mA
    Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 6 Volt
    Input Max Voltage42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt
    Output Min1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
    Efficiency (peak)92 % 91 % 92 % 92 % 92 % 92 % 89 % 95 %
    On/Off PinYes Yes Yes Yes Yes No Yes Yes
    PowerGood / Error FlagNo No No No No No No No
    SoftStartNo No No No No Yes Yes Yes
    Sync PinNo No No No Yes No Yes No
    InvertingYes Yes Yes Yes Yes Yes No
    FlybackNo No No No No No No No
    RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Controller
    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
    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
    Adjustable OutputYes Yes Yes Yes Yes Yes Yes Yes
    Adj Switch FrequencyNo No No No Yes No Yes Yes
    PWM ModeVoltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control
    TopologyBuck Buck Buck Buck Buck Buck Buck Step-Down/Buck
    Special Features500 kHz Switching Frequency 500 kHz Default Switching Frequency, 500 kHz Switching Frequency 500 kHz Switching Frequency 500 kHz Switching Frequency 500 kHz Default Switching Frequency Adjustable Current Limit
    Step-DownYes Yes Yes Yes Yes Yes Yes Yes
    Multiple Output CapabilityNo No No No No No No No
    Switching Frequency500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz
    Feedback Voltage1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 0.6 Volt
    Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
    AutomotiveNo No No No No No
    PowerWiseNo No No No No No No Yes
    Synchronous RectificationNo No No No No No No Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM22678 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Precision Enable535
    Kbytes
    10-Dec-10日本語
    中文


    Application Notes
    TitleSizeDateOther
    Language
    AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies612
    Kbytes
    14-Oct-08 
    AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications85
    Kbytes
    7-Jan-09 


    Other Technical Documents
    TitleTypeDate
    SIMPLE SWITCHER® Design GuideDesign Guide 2011-04-11

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM22678QTJ-5.0/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $3.40 each at 1K+ pcsreel
    of
    1000
    LM22678QTJ-ADJ/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $3.40 each at 1K+ pcsreel
    of
    1000
    LM22678QTJE-5.0/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide292
    MOUSERWorldwide225
    $3.40 each at 1K+ pcsreel
    of
    250
    LM22678QTJE-ADJ/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide352
    MOUSERWorldwide216
    $3.40 each at 1K+ pcsreel
    of
    250
    LM22678TJ-5.0/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $3.25 each at 1K+ pcsreel
    of
    1000
    LM22678TJ-ADJ/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide663
    CEACAsia Pacific15000
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia1961
    MOUSERWorldwide684
    TAYLORAmericas663
    $3.25 each at 1K+ pcsreel
    of
    1000
    LM22678TJE-5.0/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide176
    AVNET-EMWorldwide250
    DIGI-KEYWorldwide1999
    MOUSERWorldwide450
    NEWARKAmericas116
    TAYLORAmericas176
    $3.25 each at 1K+ pcsreel
    of
    250
    LM22678TJE-ADJ/NOPB


    RoHS Status


    TO-263 THIN
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide249
    AVNET-EMWorldwide3200
    DIGI-KEYWorldwide2527
    FARNELLEurope and Asia68
    MOUSERWorldwide622
    NEWARKAmericas312
    TAYLORAmericas249
    $3.25 each at 1K+ pcsreel
    of
    250

    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 LM22678.

    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 LM22678 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM22677EVAL/NOPB

    Evaluation Board for LM22677 & LM22678, 5A SIMPLE SWITCHER regulators with Adj Vout, Adj Freq or Freq Synch & Precision EnableFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    ARROWWorldwide11
    DIGI-KEYWorldwide13
    MOUSERWorldwide2
    TAYLORAmericas11
    $24.00 each1

    Description:

    The LM22677 evaluation board is designed to demonstrate the capabilities of the LM22677 switching regulator. The LM22677 evaluation board is configured to provide an output voltage of 3.3V up to 5A load current with an input voltage range of 4.5V to 42V. Due to the low RDS(ON) of the integrated N-channel MOSFET and maximum duty-cycle limitations, the minimum input voltage of 4.5V will only provide a 3.3V output voltage for load currents up to 500 mA. At 5.5V input voltage 3A of output current is possible while maintaining 3.3V of output voltage. For load currents higher than 3A, in input voltage of 6.5V or higher is required. The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 30 °C.

    Features:

    • Input Range: 4.5V to 42V
    • Output Voltage: 3.3V
    • Output Current Range: 0A to 5A
    • Frequency of Operation: 500 kHz
    • Board Size: 2 X 2 inches
    • Package: TO-263 THIN

    At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to reach a regulated 3.3V output voltage. To aid in the design and evaluation of DC/DC buck converter solutions based on the LM22677 switching regulator, the evaluation board can be re-configured for different output voltages.

    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
    LM22678QTJ-5.0/NOPB

    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    QTJ-5.0
    LM22678QTJ-ADJ/NOPB

    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    QTJ-ADJ
    LM22678QTJE-5.0/NOPB

    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    QTJ-5.0
    LM22678QTJE-ADJ/NOPB

    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    QTJ-ADJ
    LM22678TJ-5.0/NOPB

    790.208
    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    TJ-5.0
    LM22678TJ-ADJ/NOPB

    790.208
    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    TJ-ADJ
    LM22678TJE-5.0/NOPB

    790.208
    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    TJ-5.0
    LM22678TJE-ADJ/NOPB

    790.208
    TO-263 THIN71260DetailDownloadN/A
    NSUZXYTTE#
    LM22678
    TJ-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 LM22678.

    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 LM22678 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM22678QTJ-5.0ABCD5053640016269843461661152
    LM22678QTJ-ADJABCD5053640016269843461661152
    LM22678QTJE-5.0ABCD5053640016269843461661152
    LM22678QTJE-ADJABCD5053640016269843461661152
    LM22678TJ-5.0ABCD5053640016269843461661152
    LM22678TJ-ADJABCD5053640016269843461661152
    LM22678TJE-5.0ABCD5053640016269843461661152
    LM22678TJE-ADJABCD5053640016269843461661152

    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 LM22678.

    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 LM22678 is located at RoHS Status.

    5th Generation SIMPLE SWITCHER® Regulator Family Technical Overview
    Click image to play video in new window


    5th Generation SIMPLE SWITCHER® Regulator Family Technical Overview
    Date: 2009-03-11
    Length: 0:21:05
    [Information as of 7-Feb-2012]