National Semiconductor | High-performance Analog

 

 LM317   

3-Terminal Adjustable Regulator
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Features

  • Guaranteed 1% output voltage tolerance (LM317A)
  • Guaranteed max. 0.01%/V line regulation (LM317A)
  • Guaranteed max. 0.3% load regulation (LM117)
  • Guaranteed 1.5A output current
  • Adjustable output down to 1.2V
  • Current limit constant with temperature
  • P + Product Enhancement tested
  • 80 dB ripple rejection
  • Output is short-circuit protected
  • Description

    The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM117 is packaged in standard transistor packages which are easily mounted and handled.

    In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

    Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.

    Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

    Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output, the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current.

    For applications requiring greater output current, see LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see LM137 series data sheet.

    Also Recommended
    LP38690Lower Quiescent Current, Stable With Ceramic Output Capacitors
    LP38692Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin
    LM1086Lower Dropout Voltage



    Typical Application
    *click for larger image


    Connection Diagram
    *click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM317 LP38690 LP38692 LM1086
    Output Current500, 1500, 1000 mA 1000 mA 1000 mA 1500 mA
    Input Min Voltage4.2 Volt 2.75, 3.95, 3.3, 5.45 Volt 2.95, 2.7, 5.45, 3.75 Volt 2.6 Volt
    Input Max Voltage40, 37 Volt 10 Volt 10 Volt 27, 25, 30, 29 Volt
    Adjustable OutputYes No No No
    On/Off PinNo No Yes No
    PowerGood / Error FlagNo No No No
    Temperature Min-40, 0 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C 125 deg C
    RegTypeLinear Regulator LDO LDO LDO
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM317AEMP/NOPB

    LM317AEMP

    RoHS Status


    SOT-223
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide10429
    AVNET-EMWorldwide92
    CEACAsia Pacific4000
    DIGI-KEYWorldwide4643
    FARNELLEurope and Asia2412
    MOUSERWorldwide1129
    NEWARKAmericas5316
    RSL MICROAsia Pacific7000
    TAYLORAmericas102694
    $0.72 each at 1K+ pcsreel
    of
    1000
    LM317AEMPX/NOPB

    LM317AEMPX

    RoHS Status


    SOT-223
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide10590
    AVNET-EMWorldwide52000
    DIGI-KEYWorldwide5796
    FARNELLEurope and Asia1435
    MOUSERWorldwide974
    NEWARKAmericas570
    TAYLORAmericas22975
    $0.72 each at 1K+ pcsreel
    of
    2000
    LM317AMDT/NOPB

    LM317AMDT

    RoHS Status


    TO-252
    Full production
    Lead Time: 12 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide234
    DIGI-KEYWorldwide5205
    FARNELLEurope and Asia4873
    MOUSERWorldwide319
    NEWARKAmericas600
    RS COMPONENTSWorldwide390
    TAYLORAmericas304
    $0.64 each at 1K+ pcsrail
    of
    75
    LM317AMDTX/NOPB

    LM317AMDTX

    RoHS Status


    TO-252
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide4898
    AVNET-EMWorldwide2500
    DIGI-KEYWorldwide0
    MOUSERWorldwide2399
    TAYLORAmericas7128
    $0.64 each at 1K+ pcsreel
    of
    2500
    LM317AT/NOPB

    LM317AT

    RoHS Status


    TO-220
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide5492
    AVNET-EMWorldwide1278
    DIGI-KEYWorldwide5474
    FARNELLEurope and Asia7722
    MOUSERWorldwide2163
    NEWARKAmericas1289
    RS COMPONENTSWorldwide838
    TAYLORAmericas7942
    $0.61 each at 1K+ pcsrail
    of
    45
    LM317EMP/NOPB

    LM317EMP

    RoHS Status


    SOT-223
    Full production
    Lead Time: 16 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2967
    AVNET-EMWorldwide1029
    DIGI-KEYWorldwide31805
    FARNELLEurope and Asia6980
    MOUSERWorldwide1577
    NEWARKAmericas3624
    RS COMPONENTSWorldwide1386
    RSL MICROAsia Pacific31000
    TAYLORAmericas57805
    TECHMOSAAsia Pacific16000
    $0.43 each at 1K+ pcsreel
    of
    1000
    LM317EMPX/NOPB


    RoHS Status


    SOT-223
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    AITGAsia Pacific1001
    ARROWWorldwide19773
    AVNET-EMWorldwide2000
    BRITESTONESouth Korea634
    DIGI-KEYWorldwide0
    MOUSERWorldwide2647
    TAYLORAmericas21873
    $0.43 each at 1K+ pcsreel
    of
    2000
    LM317MDT/NOPB

    LM317MDT

    RoHS Status


    TO-252
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2138
    AVNET-EMWorldwide20
    DIGI-KEYWorldwide643
    FARNELLEurope and Asia14739
    MOUSERWorldwide800
    NEWARKAmericas140
    RS COMPONENTSWorldwide730
    TAYLORAmericas9730
    $0.47 each at 1K+ pcsrail
    of
    75
    LM317MDTX/NOPB


    RoHS Status


    TO-252
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide10000
    AVNET-EMWorldwide2500
    DIGI-KEYWorldwide0
    MOUSERWorldwide2475
    TAYLORAmericas10000
    $0.47 each at 1K+ pcsreel
    of
    2500
    LM317S/NOPB

    LM317S

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide565
    AVNET-EMWorldwide358
    DIGI-KEYWorldwide2554
    FARNELLEurope and Asia4142
    MOUSERWorldwide1267
    NEWARKAmericas394
    RS COMPONENTSWorldwide549
    TAYLORAmericas2739
    $0.66 each at 1K+ pcsrail
    of
    45
    LM317SX/NOPB

    LM317SX

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AITGAsia Pacific1001
    ARROWWorldwide697
    AVNET-EMWorldwide1000
    BRITESTONESouth Korea17500
    DIGI-KEYWorldwide2778
    FARNELLEurope and Asia730
    MOUSERWorldwide1337
    NEWARKAmericas730
    TAYLORAmericas22561
    $0.66 each at 1K+ pcsreel
    of
    500
    LM317T/NOPB


    RoHS Status


    TO-220
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AECO TECHAsia Pacific10
    ARROWWorldwide2295
    AVNET-EMWorldwide968
    BRITESTONESouth Korea2023
    DIGI-KEYWorldwide3508
    FARNELLEurope and Asia3750
    MOUSERWorldwide1986
    NEWARKAmericas119
    RS COMPONENTSWorldwide3459
    RSL MICROAsia Pacific2475
    TAYLORAmericas16185
    $0.61 each at 1K+ pcsrail
    of
    45
    LM317AH/NOPB

    LM317AH

    RoHS Status


    TO-39
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide7011
    AVNET-EMWorldwide3185
    DIGI-KEYWorldwide0
    MOUSERWorldwide500
    TAYLORAmericas7011
    $5.33 each at 1K+ pcsbox
    of
    500
    LM317H/NOPB

    LM317H

    RoHS Status


    TO-39
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide495
    AVNET-EMWorldwide8
    DIGI-KEYWorldwide222
    MOUSERWorldwide481
    TAYLORAmericas598
    $5.33 each at 1K+ pcsbox
    of
    500
    LM317K STEEL/NOPB

    LM317K STEEL

    RoHS Status


    TO-3
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide25
    AVNET-EMWorldwide66
    DIGI-KEYWorldwide592
    $22.00 each at 1K+ pcstray
    of
    50

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM317A MWC
    LM117H MD8
    NATIONAL SEMICONDUCTOR
    01 Dec 2009
    LM317AS
    NONE
    NONE
    03 Sep 2002
    LM317ASX
    NONE
    NONE
    03 Sep 2002
    LM317K MDC
    A317
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM317K MWC
    A317
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM317L MWA
    NONE
    NATIONAL SEMICONDUCTOR
    01 Dec 2009
    LM317LIBP
    NONE
    NATIONAL SEMICONDUCTOR
    24 Jul 2009
    LM317LIBPX
    NONE
    NATIONAL SEMICONDUCTOR
    24 Jul 2009

    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 LM317.

    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 LM317 is located at RoHS Status.

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM317AEMP/NOPB

    LM317AEMP
    120.612
    121.002
    SOT-22341
    1
    260
    260
    DetailN/AN/A
    XYTT
    N07A
    LM317AEMPX/NOPB

    LM317AEMPX
    120.612
    121.002
    SOT-22341
    1
    260
    260
    DetailN/AN/A
    XYTT
    N07A
    LM317AMDT/NOPB

    LM317AMDT
    288.252
    289.002
    TO-25232
    1
    260
    235
    DetailN/AN/A
    NSUZXYTT
    LM317
    AMDT
    LM317AMDTX/NOPB

    LM317AMDTX
    288.252
    289.002
    TO-25232
    1
    260
    235
    DetailN/AN/A
    NSUZXYTT
    LM317
    AMDT
    LM317AT/NOPB

    LM317AT
    1992.315
    1993.955
    TO-22031
    1
    NA
    NA
    DetailN/AN/A
    NSUZXYTTE#
    LM317AT P+
    LM317EMP/NOPB

    LM317EMP
    120.612
    121.001
    SOT-22341
    1
    260
    260
    DetailN/AN/A
    XYTT
    N01A
    LM317EMPX/NOPB

    120.612
    121.002
    SOT-22341260DetailN/AN/A
    XYTT
    N01A
    LM317MDT/NOPB

    LM317MDT
    288.252
    289.002
    TO-25232
    1
    260
    235
    DetailN/AN/A
    NSUZXYTT
    LM317
    MDT
    LM317MDTX/NOPB

    288.252
    289.002
    TO-25232260DetailN/AN/A
    NSUZXYTT
    LM317
    MDT
    LM317S/NOPB

    LM317S
    1289.225
    1289.976
    TO-26333
    3
    245
    235
    DetailN/AN/A
    NSUZXYTTE#
    LM317S
    P+
    LM317SX/NOPB

    LM317SX
    1289.225
    1289.976
    TO-26333
    3
    245
    235
    DetailN/AN/A
    NSUZXYTTE#
    LM317S
    P+
    LM317T/NOPB

    1991.806
    1993.446
    TO-22031NADetailN/AN/A
    NSUZXYTTE#
    LM317T P+
    LM317AH/NOPB

    LM317AH
    1032.657
    1032.657
    TO-3931
    1
    NA
    NA
    DetailN/AN/A
    NSZXYTTE# LM317AHP+
    LM317H/NOPB

    LM317H
    1032.657
    1032.657
    TO-3931
    1
    NA
    NA
    DetailN/AN/A
    NSZXYTTE# LM317HP+
    LM317K STEEL/NOPB

    LM317K STEEL
    12405.316
    12405.866
    TO-321
    1
    NA
    NA
    DetailN/AN/A
    NS
    ZXYTTE#
    LM317K
    STEELP+

    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 LM317.

    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 LM317 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM317MDT Qualification Package803 Kbytes19-Oct-1999

    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)
    LM317AEMPSLM04404600353250011002356520
    LM317AEMPXSLM04404600353250011002356520
    LM317AMDTSLM04404600353250011002356520
    LM317AMDTXSLM04404600353250011002356520
    LM317ATSLM04404600353250011002356520
    LM317EMPSLM04404600353250011002356520
    LM317EMPXSLM04404600353250011002356520
    LM317MDTSLM04404600353250011002356520
    LM317MDTXSLM04404600353250011002356520
    LM317SSLM04404600353250011002356520
    LM317SXSLM04404600353250011002356520
    LM317TSLM04404600353250011002356520

    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 LM317.

    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 LM317 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM317A MWC
    LM117H MD8
    NATIONAL SEMICONDUCTOR
    01 Dec 2009
    LM317AS
    NONE
    NONE
    03 Sep 2002
    LM317ASX
    NONE
    NONE
    03 Sep 2002
    LM317K MDC
    A317
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM317K MWC
    A317
    NATIONAL SEMICONDUCTOR
    03 Dec 2008
    LM317L MWA
    NONE
    NATIONAL SEMICONDUCTOR
    01 Dec 2009
    LM317LIBP
    NONE
    NATIONAL SEMICONDUCTOR
    24 Jul 2009
    LM317LIBPX
    NONE
    NATIONAL SEMICONDUCTOR
    24 Jul 2009

    What's All This Signal Current Stuff, Anyhow?
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    What's All This Signal Current Stuff, Anyhow?
    Date: 2004-09-28
    Length: 00:49:32
    [Information as of 3-Feb-2012]