National Semiconductor | High-performance Analog

 

 LM2940C   
1A Low Dropout Regulator 		Click link to Download

Features
  • Dropout voltage typically 0.5V @IO = 1A
  • Output current in excess of 1A
  • Output voltage trimmed before assembly
  • Reverse battery protection
  • Internal short circuit current limit
  • Mirror image insertion protection
  • P + Product Enhancement tested

    • Description

    The LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN − VOUT ≤ 3V).

    Designed also for vehicular applications, the LM2940/LM2940C and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

    Also Recommended
    LP38690▲Lower Quiescent Current, Stable With Ceramic Output Capacitors
    LP38692▲Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin



    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2940C LP38690 LP38692
    Output Current1000 mA 1000 mA 1000 mA
    Output Min9, 12, 15, 5 Volt 1.8, 5.0, 2.5, 3.3 Volt 1.8, 2.5, 3.3, 5 Volt
    Input Max Voltage26 Volt 10 Volt 10 Volt
    Dropout Voltage0.5 Volt 0.45, 0.95, 0.8, 0.65 Volt 0.45, 0.95, 0.8, 0.65 Volt
    Adjustable OutputNo No No
    Quiescent Current10 mA 0.055 mA 0.055 mA
    On/Off PinNo No Yes
    PowerGood / Error FlagNo No No
    RegTypeLDO LDO LDO
    Temperature Min0 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C
    Output Max9, 12, 15, 5 Volt 1.8, 5.0, 2.5, 3.3 Volt 1.8, 2.5, 3.3, 5 Volt
    Output Voltage9, 12, 15, 5 Volt 1.8, 5.0, 2.5, 3.3 Volt 1.8, 2.5, 3.3, 5 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2940C 1A Low Dropout Regulator565
    Kbytes    		18-Mar-07日本語  

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2940CS-12/NOPB

    LM2940CS-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide795
    AVNET-EMWorldwide535
    DIGI-KEYWorldwide1661
    FARNELLEurope and Asia3743
    MOUSERWorldwide585
    NEWARKAmericas64
    RS COMPONENTSWorldwide270
    TAYLORAmericas795
    		$0.69 each at 1K+ pcsrail
    of
    45
    LM2940CS-15/NOPB

    LM2940CS-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide877
    AVNET-EMWorldwide1204
    DIGI-KEYWorldwide657
    FARNELLEurope and Asia260
    MOUSERWorldwide477
    NEWARKAmericas426
    TAYLORAmericas975
    		$0.69 each at 1K+ pcsrail
    of
    45
    LM2940CS-5.0/NOPB

    LM2940CS-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide322
    AVNET-EMWorldwide1727
    DIGI-KEYWorldwide4356
    MOUSERWorldwide424
    NEWARKAmericas444
    RS COMPONENTSWorldwide425
    TAYLORAmericas4507
    		$0.69 each at 1K+ pcsrail
    of
    45
    LM2940CS-9.0/NOPB

    LM2940CS-9.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide228
    AVNET-EMWorldwide585
    DIGI-KEYWorldwide1145
    MOUSERWorldwide585
    NEWARKAmericas44
    RS COMPONENTSWorldwide120
    TAYLORAmericas228
    		$0.69 each at 1K+ pcsrail
    of
    45
    LM2940CSX-12/NOPB

    LM2940CSX-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1884
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    MOUSERWorldwide1000
    TAYLORAmericas1884
    		$0.69 each at 1K+ pcsreel
    of
    500
    LM2940CSX-15/NOPB

    LM2940CSX-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide1460
    DIGI-KEYWorldwide0
    MOUSERWorldwide1000
    TAYLORAmericas8500
    		$0.69 each at 1K+ pcsreel
    of
    500
    LM2940CSX-5.0/NOPB

    LM2940CSX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1842
    DIGI-KEYWorldwide1500
    MOUSERWorldwide999
    NEWARKAmericas9
    TAYLORAmericas33152
    		$0.69 each at 1K+ pcsreel
    of
    500
    LM2940CSX-9.0/NOPB

    LM2940CSX-9.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    		$0.69 each at 1K+ pcsreel
    of
    500
    LM2940CT-12/NOPB

    LM2940CT-12

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AECO TECHAsia Pacific225
    ARROWWorldwide4920
    AVNET-EMWorldwide490
    DIGI-KEYWorldwide1521
    FARNELLEurope and Asia1238
    MOUSERWorldwide1072
    NEWARKAmericas329
    RS COMPONENTSWorldwide880
    RSL MICROAsia Pacific16245
    TAYLORAmericas3215
    		$0.59 each at 1K+ pcsrail
    of
    45
    LM2940CT-15/NOPB

    LM2940CT-15

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1125
    AVNET-EMWorldwide177
    DIGI-KEYWorldwide503
    FARNELLEurope and Asia1370
    MOUSERWorldwide370
    NEWARKAmericas628
    RS COMPONENTSWorldwide275
    TAYLORAmericas115
    		$0.59 each at 1K+ pcsrail
    of
    45
    LM2940CT-5.0/NOPB

    LM2940CT-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide681
    AVNET-EMWorldwide3143
    DIGI-KEYWorldwide2302
    MOUSERWorldwide1610
    NEWARKAmericas2062
    RS COMPONENTSWorldwide2603
    RSL MICROAsia Pacific39060
    TAYLORAmericas24011
    		$0.59 each at 1K+ pcsrail
    of
    45
    LM2940CT-9.0/NOPB

    LM2940CT-9.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide265
    DIGI-KEYWorldwide900
    MOUSERWorldwide629
    NEWARKAmericas78
    RS COMPONENTSWorldwide285
    TAYLORAmericas265
    		$0.59 each at 1K+ pcsrail
    of
    45
    LM2940C-12 MWC

    RoHS Status    		Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    		CALLwafer jar
    of
    N/A

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2940C-5 MWC
    		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 LM2940C.

    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 LM2940C is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2940CS-12/NOPB

    LM2940CS-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -12 P+
    LM2940CS-15/NOPB

    LM2940CS-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -15 P+
    LM2940CS-5.0/NOPB

    LM2940CS-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -5.0 P+
    LM2940CS-9.0/NOPB

    LM2940CS-9.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -9.0 P+
    LM2940CSX-12/NOPB

    LM2940CSX-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -12 P+
    LM2940CSX-15/NOPB

    LM2940CSX-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -15 P+
    LM2940CSX-5.0/NOPB

    LM2940CSX-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -5.0 P+
    LM2940CSX-9.0/NOPB

    LM2940CSX-9.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CS
    -9.0 P+
    LM2940CT-12/NOPB

    LM2940CT-12
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CT
    -12 P+
    LM2940CT-15/NOPB

    LM2940CT-15
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CT
    -15 P+
    LM2940CT-5.0/NOPB

    LM2940CT-5.0
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CT
    -5.0 P+
    LM2940CT-9.0/NOPB

    LM2940CT-9.0
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2940CT
    -9.0 P+
    LM2940C-12 MWC
    		32300
    		WaferN/A
    		-

    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 LM2940C.

    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 LM2940C is located at RoHS Status.

    CAD Symbols and Models
    Download LM2940C CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2940C-12 MWCSLM04404600353250011002356520
    LM2940CS-12SLM04404600353250011002356520
    LM2940CS-15SLM04404600353250011002356520
    LM2940CS-5.0SLM04404600353250011002356520
    LM2940CS-9.0SLM04404600353250011002356520
    LM2940CSX-12SLM04404600353250011002356520
    LM2940CSX-15SLM04404600353250011002356520
    LM2940CSX-5.0SLM04404600353250011002356520
    LM2940CSX-9.0SLM04404600353250011002356520
    LM2940CT-12SLM04404600353250011002356520
    LM2940CT-15SLM04404600353250011002356520
    LM2940CT-5.0SLM04404600353250011002356520
    LM2940CT-9.0SLM04404600353250011002356520

    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 LM2940C.

    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 LM2940C is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2940C-5 MWC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    [Information as of 3-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation