National Semiconductor | High-performance Analog

 

 LM2931   
Series Low Dropout Regulators 		Click link to Download

Features

  • Very low quiescent current
  • Output current in excess of 100 mA
  • Input-output differential less than 0.6V
  • Reverse battery protection
  • 60V load dump protection
  • −50V reverse transient protection
  • Short circuit protection
  • Internal thermal overload protection
  • Mirror-image insertion protection
  • Available in TO-220, TO-92, TO-263, or SO-8 packages
  • Available as adjustable with TTL compatible switch

    • Description

    The LM2931 positive voltage regulator features a very low quiescent current of 1mA or less when supplying 10mA loads. This unique characteristic and the extremely low input-output differential required for proper regulation (0.2V for output currents of 10mA) make the LM2931 the ideal regulator for standby power systems. Applications include memory standby circuits, CMOS and other low power processor power supplies as well as systems demanding as much as 100mA of output current.

    Designed originally for automotive applications, the LM2931 and all regulated circuitry are protected from reverse battery installations or 2 battery jumps. During line transients, such as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The LM2931 cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

    The LM2931 family includes a fixed 5V output (±3.8% tolerance for A grade) or an adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package, TO-263 surface mount package, and an 8-lead surface mount package. The fixed output version is also available in the TO-92 plastic package.

    Also Recommended
    LM3480▲Higher Input Voltage, Ceramic Capacitors OK
    LP38691▲Higher Load Capability & Lower Ground Current
    LP38693▲Higher Load Capability & Lower Ground Current
    LP3878-ADJ▲Improved Output Current
    LP5900▲Wide Selection Of Voltage Options, Supports Ceramic Capacitors



    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2931 LM3480 LP38691 LP38693 LP3878-ADJ LP5900
    Output Current100 mA 100 mA 500 mA 500 mA 800 mA 150 mA
    Output Min3, 5 Volt 3.3, 12, 15, 5 Volt 1 Volt 3.3, 2.8, 1.5 Volt
    Input Max Voltage26 Volt 30 Volt 10 Volt 10 Volt 16 Volt 5.5 Volt
    Dropout Voltage0.3 Volt 0.725, 0.450, 0.550 Volt 0.725, 0.450, 0.425, 0.550 Volt 0.475 Volt 0.08 Volt
    Adjustable OutputNo No No No Yes No
    Quiescent Current0.4 mA 0.055 mA 0.055 mA 0.18 mA 0.025 mA
    On/Off PinNo, Yes No No Yes Yes Yes
    PowerGood / Error FlagNo No No No No No
    RegTypeLDO QuasiLDO LDO LDO LDO LDO
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max85 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
    Output Max24, 5 Volt 3.3, 12, 15, 5 Volt 5.5 Volt 3.3, 2.8, 1.5 Volt
    Output Voltage5 Volt 3.3, 12, 15, 5 Volt 1.8, 5.0, 5.5, 2.5, 3.3 Volt 1.8, 5.0, 2.5, 3.3 Volt Undefined Volt 3.3, 2.8, 1.5 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2931 Series Low Dropout Regulators455
    Kbytes    		14-Apr-11日本語  


    Other Technical Documents
    TitleTypeDate
    High-Efficiency Regulator has Low Drop-Out VoltageApp Note 2002-10-03
    Wide Adjustable Range PNP Voltage RegulatorApp Note 2002-10-03

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2931AM-5.0/NOPB

    LM2931AM-5.0

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide160
    AVNET-EMWorldwide1976
    DIGI-KEYWorldwide2640
    MOUSERWorldwide1154
    NEWARKAmericas1122
    RS COMPONENTSWorldwide230
    TAYLORAmericas6240
    		$0.26 each at 1K+ pcsrail
    of
    95
    LM2931AMX-5.0/NOPB

    LM2931AMX-5.0

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide7587
    DIGI-KEYWorldwide7863
    MOUSERWorldwide2398
    TAYLORAmericas7587
    		$0.26 each at 1K+ pcsreel
    of
    2500
    LM2931AS-5.0/NOPB

    LM2931AS-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide683
    AVNET-EMWorldwide201
    DIGI-KEYWorldwide77
    MOUSERWorldwide432
    NEWARKAmericas33
    TAYLORAmericas683
    		$0.79 each at 1K+ pcsrail
    of
    45
    LM2931ASX-5.0/NOPB

    LM2931ASX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide2820
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide500
    TAYLORAmericas2820
    		$0.79 each at 1K+ pcsreel
    of
    500
    LM2931AT-5.0/NOPB

    LM2931AT-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide150
    AVNET-EMWorldwide5325
    DIGI-KEYWorldwide1048
    MOUSERWorldwide809
    TAYLORAmericas424
    		$0.45 each at 1K+ pcsrail
    of
    45
    LM2931AZ-5.0/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide11
    AVNET-EMWorldwide6859
    DIGI-KEYWorldwide2057
    MOUSERWorldwide1799
    NEWARKAmericas1655
    RS COMPONENTSWorldwide871
    RSL MICROAsia Pacific90000
    TAYLORAmericas7984
    		$0.25 each at 1K+ pcsbox
    of
    1800
    LM2931CM/NOPB

    LM2931CM

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1364
    AVNET-EMWorldwide7050
    DIGI-KEYWorldwide117
    FARNELLEurope and Asia1840
    MOUSERWorldwide1375
    NEWARKAmericas741
    RS COMPONENTSWorldwide497
    TAYLORAmericas1414
    		$0.26 each at 1K+ pcsrail
    of
    95
    LM2931CMX/NOPB

    LM2931CMX

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide17025
    AVNET-EMWorldwide2500
    DIGI-KEYWorldwide0
    MOUSERWorldwide2497
    TAYLORAmericas17025
    		$0.26 each at 1K+ pcsreel
    of
    2500
    LM2931CS/NOPB

    LM2931CS

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide135
    AVNET-EMWorldwide267
    DIGI-KEYWorldwide1128
    MOUSERWorldwide452
    NEWARKAmericas90
    TAYLORAmericas135
    		$0.80 each at 1K+ pcsrail
    of
    45
    LM2931CT/NOPB

    LM2931CT

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide630
    AVNET-EMWorldwide833
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia920
    MOUSERWorldwide838
    NEWARKAmericas103
    RS COMPONENTSWorldwide342
    TAYLORAmericas630
    		$0.46 each at 1K+ pcsrail
    of
    45
    LM2931M-5.0/NOPB

    LM2931M-5.0

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2823
    AVNET-EMWorldwide37
    DIGI-KEYWorldwide0
    MOUSERWorldwide1363
    NEWARKAmericas2040
    RS COMPONENTSWorldwide655
    RSL MICROAsia Pacific1520
    TAYLORAmericas2893
    		$0.26 each at 1K+ pcsrail
    of
    95
    LM2931MX-5.0/NOPB

    LM2931MX-5.0

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide2500
    AVNET-EMWorldwide5000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    TAYLORAmericas6540
    		$0.26 each at 1K+ pcsreel
    of
    2500
    LM2931S-5.0/NOPB

    LM2931S-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide5
    AVNET-EMWorldwide295
    DIGI-KEYWorldwide406
    MOUSERWorldwide80
    NEWARKAmericas80
    TAYLORAmericas5
    		$0.80 each at 1K+ pcsrail
    of
    45
    LM2931T-5.0/NOPB

    LM2931T-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide445
    AVNET-EMWorldwide699
    DIGI-KEYWorldwide171
    MOUSERWorldwide848
    NEWARKAmericas661
    RSL MICROAsia Pacific20025
    TAYLORAmericas445
    		$0.46 each at 1K+ pcsrail
    of
    45
    LM2931Z-5.0/NOPB


    RoHS Status

    TO-92    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3758
    AVNET-EMWorldwide1107
    DIGI-KEYWorldwide1097
    MOUSERWorldwide1561
    RS COMPONENTSWorldwide810
    TAYLORAmericas3758
    		$0.26 each at 1K+ pcsbox
    of
    1800

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2931C MWC
    		LM2931
    		MOTOROLA
    		06 Dec 2005
    LM2931CSX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2931IBP-3.3
    		MIC2950
    		MICRO-REL
    		16 Nov 2008
    LM2931IBP-5.0
    		LM2931AM-5.0
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM2931IBPX-3.3
    		LM2931CM
    		NATIONAL SEMICONDUCTOR
    		05 Mar 2008
    LM2931SX-5.0
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 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 LM2931.

    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 LM2931 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2931AM-5.0/NOPB

    LM2931AM-5.0
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    2931A
    M-5.0
    LM2931AMX-5.0/NOPB

    LM2931AMX-5.0
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    2931A
    M-5.0
    LM2931AS-5.0/NOPB

    LM2931AS-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931
    AS5.0
    LM2931ASX-5.0/NOPB

    LM2931ASX-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931
    AS5.0
    LM2931AT-5.0/NOPB

    LM2931AT-5.0
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931
    AT5.0
    LM2931AZ-5.0/NOPB

    		201.662
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    LM293
    1AZ-5
    LM2931CM/NOPB

    LM2931CM
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM29
    31CM
    LM2931CMX/NOPB

    LM2931CMX
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM29
    31CM
    LM2931CS/NOPB

    LM2931CS
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931CS
    LM2931CT/NOPB

    LM2931CT
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931CT
    LM2931M-5.0/NOPB

    LM2931M-5.0
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    2931
    M-5.0
    LM2931MX-5.0/NOPB

    LM2931MX-5.0
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    2931
    M-5.0
    LM2931S-5.0/NOPB

    LM2931S-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931S
    5.0
    LM2931T-5.0/NOPB

    LM2931T-5.0
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM2931T
    5.0
    LM2931Z-5.0/NOPB

    		201.662
    202.003
    		TO-9231NADetailN/AN/A
    		NSXYTT
    LM293
    1Z-5

    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 LM2931.

    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 LM2931 is located at RoHS Status.

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2931C MWC
    		LM2931
    		MOTOROLA
    		06 Dec 2005
    LM2931CSX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2931IBP-3.3
    		MIC2950
    		MICRO-REL
    		16 Nov 2008
    LM2931IBP-5.0
    		LM2931AM-5.0
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM2931IBPX-3.3
    		LM2931CM
    		NATIONAL SEMICONDUCTOR
    		05 Mar 2008
    LM2931SX-5.0
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation