National Semiconductor | High-performance Analog

 

 LM2937   
500 mA Low Dropout Regulator 		Click link to Download

Features
  • Fully specified for operation over -40°C to +125°C
  • Output current in excess of 500 mA
  • Output trimmed for 5% tolerance under all operating conditions
  • Typical dropout voltage of 0.5V at full rated load current
  • Wide output capacitor ESR range, up to 3
  • Internal short circuit and thermal overload protection
  • Reverse battery protection
  • 60V input transient protection
  • Mirror image insertion protection

    • Description

    The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V (1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater than 3V.

    The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR below 3. This allows the use of low ESR chip capacitors.

    Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery connections, two-battery jumps and up to +60V/-50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.

    Also Recommended
    LP2989▲Better Performance, Lower Voltage
    LP38691▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
    LP38693▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
    LP3878-ADJ▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
    LM2937-2.5▲2.5V Output Voltage
    LM2937-3.3▲3.3V Output Voltage



    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM2937 LP2989 LP38691 LP38693 LP3878-ADJ LM2937-2.5 LM2937-3.3
    Output Current500 mA 500 mA 500 mA 500 mA 800 mA 500, 400 mA 500, 400 mA
    Output Min12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 1 Volt 2.5 Volt 3.3 Volt
    Input Max Voltage26 Volt 16 Volt 10 Volt 10 Volt 16 Volt 26 Volt 26 Volt
    Dropout Voltage0.5 Volt 0.31 Volt 0.725, 0.450, 0.550 Volt 0.725, 0.450, 0.425, 0.550 Volt 0.475 Volt
    Adjustable OutputNo No No No Yes No No
    Quiescent Current2 mA 0.11 mA 0.055 mA 0.055 mA 0.18 mA 2 mA 2 mA
    On/Off PinNo Yes No Yes Yes No No
    PowerGood / Error FlagNo Yes No No No No No
    RegTypeLDO LDO LDO LDO LDO LDO LDO
    Temperature Min-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, 85 deg C 125, 85 deg C
    Output Max12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 5.5 Volt 2.5 Volt 3.3 Volt
    Output Voltage12, 15, 8, 10, 5 Volt 2.5, 3.3, 3, 2.8, 5 Volt 1.8, 5.0, 5.5, 2.5, 3.3 Volt 1.8, 5.0, 2.5, 3.3 Volt Undefined Volt 2.5 Volt 3.3 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2937 500 mA Low Dropout Regulator746
    Kbytes    		29-Aug-05日本語  

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2937ES-10/NOPB

    LM2937ES-10

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide810
    AVNET-EMWorldwide125
    DIGI-KEYWorldwide987
    MOUSERWorldwide486
    NEWARKAmericas67
    TAYLORAmericas810
    		$0.77 each at 1K+ pcsrail
    of
    45
    LM2937ES-12/NOPB

    LM2937ES-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide327
    AVNET-EMWorldwide137
    DIGI-KEYWorldwide425
    FARNELLEurope and Asia1193
    MOUSERWorldwide73
    NEWARKAmericas407
    RS COMPONENTSWorldwide130
    TAYLORAmericas469
    		$0.77 each at 1K+ pcsrail
    of
    45
    LM2937ES-15/NOPB

    LM2937ES-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide348
    AVNET-EMWorldwide973
    DIGI-KEYWorldwide325
    FARNELLEurope and Asia250
    MOUSERWorldwide495
    NEWARKAmericas77
    RS COMPONENTSWorldwide75
    TAYLORAmericas407
    		$0.77 each at 1K+ pcsrail
    of
    45
    LM2937ES-5.0/NOPB

    LM2937ES-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide613
    AVNET-EMWorldwide2840
    DIGI-KEYWorldwide1277
    MOUSERWorldwide554
    NEWARKAmericas261
    RS COMPONENTSWorldwide105
    TAYLORAmericas3463
    		$0.77 each at 1K+ pcsrail
    of
    45
    LM2937ES-8.0/NOPB

    LM2937ES-8.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide136
    AVNET-EMWorldwide95
    DIGI-KEYWorldwide235
    MOUSERWorldwide220
    NEWARKAmericas149
    TAYLORAmericas136
    		$0.77 each at 1K+ pcsrail
    of
    45
    LM2937ESX-12/NOPB

    LM2937ESX-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide960
    DIGI-KEYWorldwide0
    MOUSERWorldwide500
    TAYLORAmericas960
    		$0.77 each at 1K+ pcsreel
    of
    500
    LM2937ESX-15/NOPB

    LM2937ESX-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide450
    		$0.77 each at 1K+ pcsreel
    of
    500
    LM2937ESX-5.0/NOPB

    LM2937ESX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide9322
    AVNET-EMWorldwide319
    DIGI-KEYWorldwide6344
    MOUSERWorldwide1000
    RSL MICROAsia Pacific2000
    TAYLORAmericas9322
    		$0.77 each at 1K+ pcsreel
    of
    500
    LM2937ESX-8.0/NOPB

    LM2937ESX-8.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3500
    CEACAsia Pacific3000
    DIGI-KEYWorldwide0
    MOUSERWorldwide500
    TAYLORAmericas3500
    		$0.77 each at 1K+ pcsreel
    of
    500
    LM2937ET-10/NOPB

    LM2937ET-10

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide585
    DIGI-KEYWorldwide900
    FARNELLEurope and Asia153
    MOUSERWorldwide581
    		$0.65 each at 1K+ pcsrail
    of
    45
    LM2937ET-12/NOPB

    LM2937ET-12

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide193
    AVNET-EMWorldwide795
    DIGI-KEYWorldwide646
    FARNELLEurope and Asia775
    MOUSERWorldwide1170
    NEWARKAmericas28
    RS COMPONENTSWorldwide385
    TAYLORAmericas1574
    		$0.65 each at 1K+ pcsrail
    of
    45
    LM2937ET-15/NOPB

    LM2937ET-15

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide385
    AVNET-EMWorldwide369
    DIGI-KEYWorldwide20
    FARNELLEurope and Asia715
    MOUSERWorldwide579
    NEWARKAmericas287
    RS COMPONENTSWorldwide20
    TAYLORAmericas916
    		$0.65 each at 1K+ pcsrail
    of
    45
    LM2937ET-5.0/NOPB

    LM2937ET-5.0

    RoHS Status    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1083
    AVNET-EMWorldwide32
    DIGI-KEYWorldwide141
    MOUSERWorldwide85
    NEWARKAmericas918
    RS COMPONENTSWorldwide362
    TAYLORAmericas5212
    		$0.65 each at 1K+ pcsrail
    of
    45
    LM2937ET-8.0/NOPB

    LM2937ET-8.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide135
    AVNET-EMWorldwide480
    DIGI-KEYWorldwide394
    MOUSERWorldwide585
    NEWARKAmericas361
    TAYLORAmericas135
    		$0.65 each at 1K+ pcsrail
    of
    45
    LM2937IMP-10/NOPB

    LM2937IMP-10

    RoHS Status

    SOT-223    		Full production
    Lead Time: 16 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4000
    DIGI-KEYWorldwide2844
    FARNELLEurope and Asia968
    MOUSERWorldwide970
    NEWARKAmericas839
    RS COMPONENTSWorldwide225
    TAYLORAmericas4000
    		$0.69 each at 1K+ pcsreel
    of
    1000
    LM2937IMP-12/NOPB

    LM2937IMP-12

    RoHS Status

    SOT-223    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1847
    AVNET-EMWorldwide3750
    DIGI-KEYWorldwide4976
    FARNELLEurope and Asia1921
    MOUSERWorldwide762
    NEWARKAmericas1710
    RSL MICROAsia Pacific1000
    TAYLORAmericas5396
    		$0.69 each at 1K+ pcsreel
    of
    1000
    LM2937IMP-5.0/NOPB

    LM2937IMP-5.0

    RoHS Status

    SOT-223    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide51317
    AVNET-EMWorldwide3352
    DIGI-KEYWorldwide18743
    MOUSERWorldwide774
    NEWARKAmericas518
    TAYLORAmericas51317
    		$0.69 each at 1K+ pcsreel
    of
    1000
    LM2937IMP-8.0/NOPB

    LM2937IMP-8.0

    RoHS Status

    SOT-223    		Full production
    Lead Time: 16 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide12161
    AVNET-EMWorldwide5000
    DIGI-KEYWorldwide7976
    MOUSERWorldwide870
    NEWARKAmericas927
    TAYLORAmericas12161
    		$0.69 each at 1K+ pcsreel
    of
    1000
    LM2937IMPX-10/NOPB

    LM2937IMPX-10

    RoHS Status

    SOT-223    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide4000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2000
    		$0.69 each at 1K+ pcsreel
    of
    2000
    LM2937IMPX-12/NOPB

    LM2937IMPX-12

    RoHS Status

    SOT-223    		Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide0
    		$0.69 each at 1K+ pcsreel
    of
    2000
    LM2937IMPX-15/NOPB

    LM2937IMPX-15

    RoHS Status

    SOT-223    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2000
    		$0.69 each at 1K+ pcsreel
    of
    2000
    LM2937IMPX-5.0/NOPB

    LM2937IMPX-5.0

    RoHS Status

    SOT-223    		Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide2745
    AVNET-EMWorldwide1800
    DIGI-KEYWorldwide0
    MOUSERWorldwide1990
    TAYLORAmericas2745
    		$0.69 each at 1K+ pcsreel
    of
    2000
    LM2937IMPX-8.0/NOPB

    LM2937IMPX-8.0

    RoHS Status

    SOT-223    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide4000
    AVNET-EMWorldwide4000
    DIGI-KEYWorldwide0
    TAYLORAmericas4000
    		$0.69 each at 1K+ pcsreel
    of
    2000
    LM2937E-5.0 MWC

    RoHS Status    		Full production
    Lead Time: N/A

     

    Contact your distributor
    		CALLwafer jar
    of
    N/A

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2937ESX-10
    		MIC2937
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2937ESX-2.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2937IMP-15
    		LM2937IMPX-15
    		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 LM2937.

    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 LM2937 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2937ES-10/NOPB

    LM2937ES-10
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -10
    LM2937ES-12/NOPB

    LM2937ES-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -12
    LM2937ES-15/NOPB

    LM2937ES-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -15
    LM2937ES-5.0/NOPB

    LM2937ES-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -5.0
    LM2937ES-8.0/NOPB

    LM2937ES-8.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -8.0
    LM2937ESX-12/NOPB

    LM2937ESX-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -12
    LM2937ESX-15/NOPB

    LM2937ESX-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -15
    LM2937ESX-5.0/NOPB

    LM2937ESX-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -5.0
    LM2937ESX-8.0/NOPB

    LM2937ESX-8.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ES
    -8.0
    LM2937ET-10/NOPB

    LM2937ET-10
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ET
    -10
    LM2937ET-12/NOPB

    LM2937ET-12
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ET
    -12
    LM2937ET-15/NOPB

    LM2937ET-15
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ET
    -15
    LM2937ET-5.0/NOPB

    LM2937ET-5.0
    		1992.315
    1993.955
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ET
    -5.0
    LM2937ET-8.0/NOPB

    LM2937ET-8.0
    		1991.805
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2937ET
    -8.0
    LM2937IMP-10/NOPB

    LM2937IMP-10
    		120.611
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L73B
    LM2937IMP-12/NOPB

    LM2937IMP-12
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L74B
    LM2937IMP-5.0/NOPB

    LM2937IMP-5.0
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L71B
    LM2937IMP-8.0/NOPB

    LM2937IMP-8.0
    		120.611
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L72B
    LM2937IMPX-10/NOPB

    LM2937IMPX-10
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L73B
    LM2937IMPX-12/NOPB

    LM2937IMPX-12
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L74B
    LM2937IMPX-15/NOPB

    LM2937IMPX-15
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L75B
    LM2937IMPX-5.0/NOPB

    LM2937IMPX-5.0
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L71B
    LM2937IMPX-8.0/NOPB

    LM2937IMPX-8.0
    		120.612
    121.002
    		SOT-22341
    1    		260
    260    		DetailDownloadN/A
    		XYTT
    L72B
    LM2937E-5.0 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 LM2937.

    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 LM2937 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2937 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2937E-5.0 MWCSLM04404600353250011002356520
    LM2937ES-10SLM04404600353250011002356520
    LM2937ES-12SLM04404600353250011002356520
    LM2937ES-15SLM04404600353250011002356520
    LM2937ES-5.0SLM04404600353250011002356520
    LM2937ES-8.0SLM04404600353250011002356520
    LM2937ESX-12SLM04404600353250011002356520
    LM2937ESX-15SLM04404600353250011002356520
    LM2937ESX-5.0SLM04404600353250011002356520
    LM2937ESX-8.0SLM04404600353250011002356520
    LM2937ET-10SLM04404600353250011002356520
    LM2937ET-12SLM04404600353250011002356520
    LM2937ET-15SLM04404600353250011002356520
    LM2937ET-5.0SLM04404600353250011002356520
    LM2937ET-8.0SLM04404600353250011002356520
    LM2937IMP-10SLM04404600353250011002356520
    LM2937IMP-12SLM04404600353250011002356520
    LM2937IMP-5.0SLM04404600353250011002356520
    LM2937IMP-8.0SLM04404600353250011002356520
    LM2937IMPX-10SLM04404600353250011002356520
    LM2937IMPX-12SLM04404600353250011002356520
    LM2937IMPX-15SLM04404600353250011002356520
    LM2937IMPX-5.0SLM04404600353250011002356520
    LM2937IMPX-8.0SLM04404600353250011002356520

    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 LM2937.

    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 LM2937 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2937ESX-10
    		MIC2937
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2937ESX-2.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2937IMP-15
    		LM2937IMPX-15
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    [Information as of 8-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation