National Semiconductor | High-performance Analog

 

 LM2937-3.3   

400mA and 500mA Voltage Regulator
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Features
  • Fully specified for operation over -40°C to +125°C
  • Output current in excess of 500 mA (400mA for SOT-223 package)
  • Output trimmed for 5% tolerance under all operating conditions
  • Wide output capacitor ESR range, 0.01 up to 5
  • Internal short circuit and thermal overload protection
  • Reverse battery protection
  • 60V input transient protection
  • Mirror image insertion protection
  • Description

    The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 mA of load current. Both regulators are ideal for converting a common 5V logic supply, or higher input supply voltage, to the lower 2.5V and 3.3V supplies to power VLSI ASIC's and microcontrollers. 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 5V.

    The LM2937 requires an output bypass capacitor for stability. As with most regulators utilizing a PNP pass transistor, the ESR of this capacitor remains a critical design parameter, but the LM2937-2.5 and LM2937-3.3 include special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR ratings less than 5. This allows the use of low ESR chip capacitors.

    The regulators are also suited for automotive applications, with built in protection 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
    LP2989Better Performance, Lower Voltage
    LM2937Different Output Voltages
    LM2937-2.52.5V Output Voltage



    Parameters / ValuesLM2937-3.3 LP2989 LM2937 LM2937-2.5
    Output Current500, 400 mA 500 mA 500 mA 500, 400 mA
    Output Min3.3 Volt 2.5, 3.3, 3, 2.8, 5 Volt 12, 15, 8, 10, 5 Volt 2.5 Volt
    Input Min Voltage4.75 Volt 5.31, 3.11, 3.61, 2.81 Volt 4.75 Volt
    Input Max Voltage26 Volt 16 Volt 26 Volt 26 Volt
    Adjustable OutputNo No No No
    Quiescent Current2 mA 0.11 mA 2 mA 2 mA
    On/Off PinNo Yes No No
    PowerGood / Error FlagNo Yes No No
    RegTypeLDO LDO LDO LDO
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max125, 85 deg C 125 deg C 125 deg C 125, 85 deg C
    Output Max3.3 Volt 2.5, 3.3, 3, 2.8, 5 Volt 12, 15, 8, 10, 5 Volt 2.5 Volt
    Output Voltage3.3 Volt 2.5, 3.3, 3, 2.8, 5 Volt 12, 15, 8, 10, 5 Volt 2.5 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2937-3.3 400mA and 500mA Voltage Regulator735
    Kbytes
    29-Aug-05   

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2937ES-3.3/NOPB

    LM2937ES-3.3

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide103
    AVNET-EMWorldwide2303
    DIGI-KEYWorldwide991
    MOUSERWorldwide636
    NEWARKAmericas139
    RS COMPONENTSWorldwide360
    TAYLORAmericas4047
    $0.77 each at 1K+ pcsrail
    of
    45
    LM2937ESX-3.3/NOPB

    LM2937ESX-3.3

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AITGAsia Pacific1000
    ARROWWorldwide5095
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide492
    TAYLORAmericas9095
    $0.77 each at 1K+ pcsreel
    of
    500
    LM2937ET-3.3/NOPB

    LM2937ET-3.3

    RoHS Status


    TO-220
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide695
    AVNET-EMWorldwide234
    DIGI-KEYWorldwide1367
    MOUSERWorldwide227
    NEWARKAmericas22
    RS COMPONENTSWorldwide430
    TAYLORAmericas3613
    $0.65 each at 1K+ pcsrail
    of
    45
    LM2937IMP-3.3/NOPB

    LM2937IMP-3.3

    RoHS Status


    SOT-223
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2150
    AVNET-EMWorldwide17482
    DIGI-KEYWorldwide9763
    MOUSERWorldwide1931
    NEWARKAmericas1374
    TAYLORAmericas73189
    $0.69 each at 1K+ pcsreel
    of
    1000
    LM2937IMPX-3.3/NOPB

    LM2937IMPX-3.3

    RoHS Status


    SOT-223
    Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    ARROWWorldwide1887
    AVNET-EMWorldwide6000
    DIGI-KEYWorldwide0
    MOUSERWorldwide1619
    TAYLORAmericas1887
    $0.69 each at 1K+ pcsreel
    of
    2000

    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 LM2937-3.3.

    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 LM2937-3.3 is located at RoHS Status.

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM2937ES-3.3/NOPB

    LM2937ES-3.3
    1289.225
    1289.976
    TO-26333
    3
    245
    235
    DetailN/AN/A
    NSUZXYTTE#
    LM2937ES
    -3.3
    LM2937ESX-3.3/NOPB

    LM2937ESX-3.3
    1289.225
    1289.976
    TO-26333
    3
    245
    235
    DetailN/AN/A
    NSUZXYTTE#
    LM2937ES
    -3.3
    LM2937ET-3.3/NOPB

    LM2937ET-3.3
    1991.806
    1993.446
    TO-22031
    1
    NA
    NA
    DetailN/AN/A
    NSUZXYTTE#
    LM2937ET
    -3.3
    LM2937IMP-3.3/NOPB

    LM2937IMP-3.3
    120.612
    121.002
    SOT-22341
    1
    260
    260
    DetailN/AN/A
    XYTT
    L69B
    LM2937IMPX-3.3/NOPB

    LM2937IMPX-3.3
    120.612
    121.002
    SOT-22341
    1
    260
    260
    DetailN/AN/A
    XYTT
    L69B

    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 LM2937-3.3.

    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 LM2937-3.3 is located at RoHS Status.

    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)
    LM2937ES-3.3SLM04404600353250011002356520
    LM2937ESX-3.3SLM04404600353250011002356520
    LM2937ET-3.3SLM04404600353250011002356520
    LM2937IMP-3.3SLM04404600353250011002356520
    LM2937IMPX-3.3SLM04404600353250011002356520

    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 LM2937-3.3.

    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 LM2937-3.3 is located at RoHS Status.

    [Information as of 3-Feb-2012]