National Semiconductor | High-performance Analog

 

 LM22671   

500 mA SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features
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Features

  • Wide input voltage range: 4.5V to 42V
  • Internally compensated voltage mode control
  • Stable with low ESR ceramic capacitors
  • 200 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, adjustable between 200 kHz and 1 MHz
  • -40°C to 125°C operating junction temperature range
  • Precision enable pin
  • Integrated boot diode
  • Adjustable soft-start
  • Fully WEBENCH ® enabled
  • Step-down and inverting buck-boost applications
  • LM22671Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
  • Description

    The LM22671 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 500 mA 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 switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1 MHz. It is also possible to self-synchronize multiple regulators to share the same switching frequency. The LM22671 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. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.


    Applications

  • Industrial Control
  • Telecom and Datacom Systems
  • Embedded Systems
  • Automotive Telematics and Body Electronics
  • Conversions from Standard 24V, 12V and 5V Input Rails
  • WEBENCH® LM22671
        Min   Max   Range  
      VIN V    4.50 – 42.00V  
      VOUT V    1.28 – 37.00V  
      IOUT A    ≤ 0.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM226703A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
    LM226721A Version
    LM226733A, Features Adjustable Soft-Start And Adjustable Current Limit
    LM22674Features Precision Enable Only
    LM226775A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
    LM226795A, Features Adjustable Soft-Start And Adjustable Current Limit
    LM226802A Version



    Typical Application
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    Connection Diagram
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    Typical Performance
    click for larger image


    Parameters / ValuesLM22671 LM22670 LM22672 LM22673 LM22674 LM22677 LM22679 LM22680
    Output Current500 mA 3000 mA 1000 mA 3000 mA 500 mA 5000 mA 5000 mA 2000 mA
    Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 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 1.285 Volt
    Frequency Min200 kHz 200 kHz 200 kHz 200 kHz 200 kHz
    Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz
    Efficiency (peak)91 % 92 % 92 % 92 % 91 % 92 % 92 % 89 %
    On/Off PinYes Yes Yes No Yes Yes No Yes
    PowerGood / Error FlagNo No No No No No No No
    SoftStartYes No Yes Yes No No Yes Yes
    Sync PinYes Yes Yes No No Yes No Yes
    InvertingYes Yes Yes Yes Yes Yes Yes
    FlybackNo No No No No No No No
    RegTypeSwitching 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
    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 FrequencyYes Yes Yes No No Yes No Yes
    PWM ModeVoltage Mode Control Voltage 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 Buck
    Special Features500 kHz Default Switching Fequency 500 kHz Default Switching Frequency 500 kHz Default Switching Frequency Adjustable Current Limit 500 kHz Default 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 500 kHz
    Feedback Voltage1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
    Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
    AutomotiveNo No No No No No No
    PowerWiseNo No No No No No No No
    Synchronous RectificationNo No No No No No No No

    Datasheets
    TitleSizeDateOther
    Language
    LM22671 500 mA SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features419
    Kbytes
    24-Jan-11日本語
    中文


    Application Notes
    TitleSizeDateOther
    Language
    AN-1895: Application Note 1895 LM22671 Evaluation Board255
    Kbytes
    6-Jul-10 
    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
    LM22671MR-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide360
    AVNET-EMWorldwide374
    DIGI-KEYWorldwide0
    MOUSERWorldwide289
    TAYLORAmericas360
    $1.38 each at 1K+ pcsrail
    of
    95
    LM22671MR-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide43
    DIGI-KEYWorldwide0
    MOUSERWorldwide285
    TAYLORAmericas43
    $1.38 each at 1K+ pcsrail
    of
    95
    LM22671MRE-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide750
    DIGI-KEYWorldwide448
    MOUSERWorldwide250
    NEWARKAmericas78
    TAYLORAmericas750
    $1.38 each at 1K+ pcsreel
    of
    250
    LM22671MRE-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide440
    DIGI-KEYWorldwide1585
    FARNELLEurope and Asia1126
    MOUSERWorldwide240
    NEWARKAmericas193
    TAYLORAmericas440
    $1.38 each at 1K+ pcsreel
    of
    250
    LM22671MRX-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.38 each at 1K+ pcsreel
    of
    2500
    LM22671MRX-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.38 each at 1K+ pcsreel
    of
    2500
    LM22671QMR-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide202
    MOUSERWorldwide285
    $1.53 each at 1K+ pcsrail
    of
    95
    LM22671QMR-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide212
    MOUSERWorldwide285
    $1.53 each at 1K+ pcsrail
    of
    95
    LM22671QMRE-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.53 each at 1K+ pcsreel
    of
    250
    LM22671QMRE-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.53 each at 1K+ pcsreel
    of
    250
    LM22671QMRX-5.0/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.53 each at 1K+ pcsreel
    of
    2500
    LM22671QMRX-ADJ/NOPB


    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.53 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 LM22671.

    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 LM22671 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM22671EVAL/NOPB

    Evaluation Board for LM22671 & LM22674, 0.5A SIMPLE SWITCHER regulators with Adj Vout, Adj Freq or Freq Synch, Precision Enable & Soft startFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    AVNET-EMWorldwide14
    DIGI-KEYWorldwide4
    MOUSERWorldwide1
    $24.00 each1

    Description:

    The LM22671 evaluation board is designed to demonstrate the capabilities of the LM22671switching regulator. The LM22671 evaluation board is configured to provide an output voltage of 3.3V up to 500 mA load current with an input voltage range of 4.5V to 42V. The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 50 °C.

    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 LM22671 switching regulator, the evaluation board can be re-configured for different output voltages.

    Features:

    • Input Range: 4.5V to 42V
    • Output Voltage: 3.3V
    • Output Current Range: 0A to 500 mA
    • Frequency of Operation: 500 kHz
    • Board Size: 1.5 X 1.5 inches
    • Package: PSOP-8

    Contents:

    • LM22671 Assembled Evaluation Board
    • Application Note 1895 for the LM22671 Evaluation Board
    • LM22671 Datasheet



    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
    LM22671MR-5.0/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    5.0
    LM22671MR-ADJ/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    ADJ
    LM22671MRE-5.0/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    5.0
    LM22671MRE-ADJ/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    ADJ
    LM22671MRX-5.0/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    5.0
    LM22671MRX-ADJ/NOPB

    77.907
    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    ADJ
    LM22671QMR-5.0/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    Q5.0
    LM22671QMR-ADJ/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    QADJ
    LM22671QMRE-5.0/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    Q5.0
    LM22671QMRE-ADJ/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    QADJ
    LM22671QMRX-5.0/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    Q5.0
    LM22671QMRX-ADJ/NOPB

    PSOP83260DetailDownloadN/A
    NSXYTT
    L22671
    QADJ

    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 LM22671.

    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 LM22671 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM22671MR-5.0ABCD5053640016269843461661152
    LM22671MR-ADJABCD5053640016269843461661152
    LM22671MRE-5.0ABCD5053640016269843461661152
    LM22671MRE-ADJABCD5053640016269843461661152
    LM22671MRX-5.0ABCD5053640016269843461661152
    LM22671MRX-ADJABCD5053640016269843461661152
    LM22671QMR-5.0ABCD5053640016269843461661152
    LM22671QMR-ADJABCD5053640016269843461661152
    LM22671QMRE-5.0ABCD5053640016269843461661152
    LM22671QMRE-ADJABCD5053640016269843461661152
    LM22671QMRX-5.0ABCD5053640016269843461661152
    LM22671QMRX-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 LM22671.

    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 LM22671 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]