National Semiconductor | High-performance Analog

 

 LM2990   
Negative Low Dropout Regulator 		Click link to Download

Features

  • 5% output accuracy over entire operating range
  • Output current in excess of 1A
  • Dropout voltage typically 0.6V at 1A load
  • Low quiescent current
  • Internal short circuit current limit
  • Internal thermal shutdown with hysteresis
  • Functional complement to the LM2940 series

    • Description

    The LM2990 is a three-terminal, low dropout, 1 ampere negative voltage regulator available with fixed output voltages of −5, −5.2, −12, and −15V.

    The LM2990 uses new circuit design techniques to provide low dropout and low quiescent current. The dropout voltage at 1A load current is typically 0.6V and a guaranteed worst-case maximum of 1V over the entire operating temperature range. The quiescent current is typically 1 mA with 1A load current and an input-output voltage differential greater than 3V. A unique circuit design of the internal bias supply limits the quiescent current to only 9 mA (typical) when the regulator is in the dropout mode (VOUT − VIN ≤ 3V). Output voltage accuracy is guaranteed to ±5% over load, and temperature extremes.

    The LM2990 is short-circuit proof, and thermal shutdown includes hysteresis to enhance the reliability of the device when overloaded for an extended period of time. The LM2990 is available in a 3-lead TO-220 package and is rated for operation over the automotive temperature range of −40°C to +125°C.


    Applications

  • Post switcher regulator
  • Local, on-card, regulation
  • Battery operated equipment




    • Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Output Current 1500 mA
    Output Min -15, -5.2, -5, -12 Volt
    Input Min Voltage -26 Volt
    Input Max Voltage 0.3 Volt
    Dropout Voltage 0.6 Volt
    Adjustable Output No
    Quiescent Current 1 mA
    On/Off Pin No
    PowerGood / Error Flag No
    RegType LDO
    Temperature Min -40 deg C
    Temperature Max 125 deg C
    Output Max -15, -5.2, -5, -12 Volt
    Output Voltage -15, -5.2, -5, -12 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2990 Negative Low Dropout Regulator543
    Kbytes    		31-Aug-10日本語  


    Other Technical Documents
    TitleTypeDate
    Linear and Switching Voltage Regulator Fundamental Part 1App Note 2007-03-21

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2990S-12/NOPB

    LM2990S-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide538
    AVNET-EMWorldwide370
    DIGI-KEYWorldwide363
    MOUSERWorldwide39
    NEWARKAmericas115
    RS COMPONENTSWorldwide10
    TAYLORAmericas618
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990S-15/NOPB

    LM2990S-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide7
    AVNET-EMWorldwide225
    DIGI-KEYWorldwide236
    FARNELLEurope and Asia80
    MOUSERWorldwide439
    NEWARKAmericas54
    RS COMPONENTSWorldwide10
    TAYLORAmericas1087
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990S-5.0/NOPB

    LM2990S-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1050
    AVNET-EMWorldwide329
    DIGI-KEYWorldwide790
    MOUSERWorldwide372
    NEWARKAmericas601
    RS COMPONENTSWorldwide5
    TAYLORAmericas2169
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990SX-12/NOPB

    LM2990SX-12

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1500
    DIGI-KEYWorldwide0
    MOUSERWorldwide450
    TAYLORAmericas1500
    		$1.35 each at 1K+ pcsreel
    of
    500
    LM2990SX-15/NOPB

    LM2990SX-15

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide485
    TAYLORAmericas500
    		$1.35 each at 1K+ pcsreel
    of
    500
    LM2990SX-5.0/NOPB

    LM2990SX-5.0

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3500
    DIGI-KEYWorldwide0
    MOUSERWorldwide791
    NEWARKAmericas492
    TAYLORAmericas19625
    		$1.35 each at 1K+ pcsreel
    of
    500
    LM2990T-12/NOPB

    LM2990T-12

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide575
    AVNET-EMWorldwide225
    DIGI-KEYWorldwide225
    FARNELLEurope and Asia30
    MOUSERWorldwide114
    NEWARKAmericas13
    RS COMPONENTSWorldwide40
    TAYLORAmericas1299
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990T-15/NOPB

    LM2990T-15

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide15
    AVNET-EMWorldwide61
    DIGI-KEYWorldwide310
    FARNELLEurope and Asia338
    MOUSERWorldwide109
    NEWARKAmericas179
    RS COMPONENTSWorldwide50
    TAYLORAmericas1230
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990T-5.0/NOPB

    LM2990T-5.0

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1030
    DIGI-KEYWorldwide802
    MOUSERWorldwide67
    NEWARKAmericas91
    RS COMPONENTSWorldwide172
    TAYLORAmericas2796
    		$1.35 each at 1K+ pcsrail
    of
    45
    LM2990T-5.2/NOPB

    LM2990T-5.2

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide391
    AVNET-EMWorldwide145
    DIGI-KEYWorldwide190
    MOUSERWorldwide238
    NEWARKAmericas20
    TAYLORAmericas525
    		$1.35 each at 1K+ pcsrail
    of
    45

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2990-12 MD8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		06 Dec 2005
    LM2990-15 MD8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2990J-12-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990J-15-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990J-5.0-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990T-15 MWC
    		NONE
    		NONE
    		08 Sep 1999
    LM2990WG-12-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990WG-15-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990WG5.0-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008

    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 LM2990.

    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 LM2990 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2990S-12/NOPB

    LM2990S-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -12 P+
    LM2990S-15/NOPB

    LM2990S-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -15 P+
    LM2990S-5.0/NOPB

    LM2990S-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -5.0 P+
    LM2990SX-12/NOPB

    LM2990SX-12
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -12 P+
    LM2990SX-15/NOPB

    LM2990SX-15
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -15 P+
    LM2990SX-5.0/NOPB

    LM2990SX-5.0
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990S
    -5.0 P+
    LM2990T-12/NOPB

    LM2990T-12
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990T
    -12 P+
    LM2990T-15/NOPB

    LM2990T-15
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990T
    -15 P+
    LM2990T-5.0/NOPB

    LM2990T-5.0
    		1992.315
    1993.955
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990T
    -5.0 P+
    LM2990T-5.2/NOPB

    LM2990T-5.2
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2990T
    -5.2 P+

    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 LM2990.

    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 LM2990 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2990 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2990S-12SLM04404600353250011002356520
    LM2990S-15SLM04404600353250011002356520
    LM2990S-5.0SLM04404600353250011002356520
    LM2990SX-12SLM04404600353250011002356520
    LM2990SX-15SLM04404600353250011002356520
    LM2990SX-5.0SLM04404600353250011002356520
    LM2990T-12SLM04404600353250011002356520
    LM2990T-15SLM04404600353250011002356520
    LM2990T-5.0SLM04404600353250011002356520
    LM2990T-5.2SLM04404600353250011002356520

    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 LM2990.

    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 LM2990 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2990-12 MD8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		06 Dec 2005
    LM2990-15 MD8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM2990J-12-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990J-15-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990J-5.0-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990T-15 MWC
    		NONE
    		NONE
    		08 Sep 1999
    LM2990WG-12-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990WG-15-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2990WG5.0-QML
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008

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