National Semiconductor | High-performance Analog

 

 LM2941   
1A Low Dropout Adjustable Regulator 		Click link to Download

Features

  • LLP space saving package
  • Output voltage adjustable from 5V to 20V
  • Dropout voltage typically 0.5V @ IO = 1A
  • Output current in excess of 1A
  • Trimmed reference voltage
  • Reverse battery protection
  • Internal short circuit current limit
  • Mirror image insertion protection
  • P + Product Enhancement tested
  • TTL, CMOS compatible ON/OFF switch

    • Description

    The LM2941 positive voltage regulator features the ability to source 1A of output current with a typical dropout voltage of 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 pin 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 30mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN − VOUT  ≤ 3V).

    Designed also for vehicular applications, the LM2941 and all regulated circuitry are protected from reverse battery installations or two-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. 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
    LP3878-ADJ▲Improved Output Current


    5V to 20V Adjustable Regulator

    Parameters / ValuesLM2941 LP38690 LP38692 LP3878-ADJ
    Output Current1000 mA 1000 mA 1000 mA 800 mA
    Output Min5 Volt 1.8, 5.0, 2.5, 3.3 Volt 1.8, 2.5, 3.3, 5 Volt 1 Volt
    Input Min Voltage-15 Volt 2.75, 3.95, 3.3, 5.45 Volt 2.95, 2.7, 5.45, 3.75 Volt 2.5 Volt
    Input Max Voltage26 Volt 10 Volt 10 Volt 16 Volt
    Dropout Voltage0.5 Volt 0.45, 0.95, 0.8, 0.65 Volt 0.45, 0.95, 0.8, 0.65 Volt 0.475 Volt
    Adjustable OutputYes No No Yes
    Quiescent Current10 mA 0.055 mA 0.055 mA 0.18 mA
    On/Off PinYes No Yes Yes
    PowerGood / Error FlagNo No No No
    RegTypeLDO LDO LDO LDO
    Temperature Min-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
    Output Max20 Volt 1.8, 5.0, 2.5, 3.3 Volt 1.8, 2.5, 3.3, 5 Volt 5.5 Volt
    Feedback Voltage1.275 Volt Undefined Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM2941 1A Low Dropout Adjustable Regulator350
    Kbytes    		8-Jun-11日本語  
    LM2941 Mil-Aero Datasheet MNLM2941-X215 Kbytes 


    Other Technical Documents
    TitleTypeDate
    Accurate power supplies using integrated voltage regulatorsExternal Article 2009-12-03

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2941LD/NOPB

    LM2941LD

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AITGAsia Pacific1001
    ARROWWorldwide575
    AVNET-EMWorldwide9000
    DIGI-KEYWorldwide128
    FARNELLEurope and Asia1706
    MOUSERWorldwide960
    TAYLORAmericas1631
    		$0.68 each at 1K+ pcsreel
    of
    1000
    LM2941LDX/NOPB

    LM2941LDX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide7489
    DIGI-KEYWorldwide0
    MOUSERWorldwide3500
    TAYLORAmericas7489
    TECHMOSAAsia Pacific19500
    		$0.68 each at 1K+ pcsreel
    of
    4500
    LM2941S/NOPB

    LM2941S

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1730
    AVNET-EMWorldwide11807
    DIGI-KEYWorldwide12255
    FARNELLEurope and Asia617
    MOUSERWorldwide470
    NEWARKAmericas128
    RS COMPONENTSWorldwide20
    TAYLORAmericas4925
    		$0.70 each at 1K+ pcsrail
    of
    45
    LM2941SX/NOPB

    LM2941SX

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide345
    AVNET-EMWorldwide10000
    CEACAsia Pacific1500
    DIGI-KEYWorldwide4999
    FARNELLEurope and Asia734
    MOUSERWorldwide738
    NEWARKAmericas734
    TAYLORAmericas8435
    		$0.70 each at 1K+ pcsreel
    of
    500
    LM2941T/NOPB

    LM2941T

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide914
    AVNET-EMWorldwide3851
    DIGI-KEYWorldwide1754
    FARNELLEurope and Asia437
    MOUSERWorldwide276
    NEWARKAmericas649
    RS COMPONENTSWorldwide25
    TAYLORAmericas14111
    		$0.61 each at 1K+ pcsrail
    of
    45

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2941-ADJ MDC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941-ADJ MWC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J-MLS
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J-QMLV
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J/883
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941K-MLS
    		NONE
    		NONE
    		09 Mar 1999
    LM2941K/883
    		NONE
    		NONE
    		08 Sep 1999

    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 LM2941.

    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 LM2941 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2941LD/NOPB

    LM2941LD
    		37.272
    37.401
    		LLP83
    1    		260
    235    		DetailDownloadN/A
    		NS
    UZXYTT
    L2941LD
    LM2941LDX/NOPB

    LM2941LDX
    		37.272
    37.401
    		LLP83
    1    		260
    235    		DetailDownloadN/A
    		NS
    UZXYTT
    L2941LD
    LM2941S/NOPB

    LM2941S
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2941S
    P+
    LM2941SX/NOPB

    LM2941SX
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2941S
    P+
    LM2941T/NOPB

    LM2941T
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM2941T
    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 LM2941.

    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 LM2941 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2941 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2941LDSLM04404600353250011002356520
    LM2941LDXSLM04404600353250011002356520
    LM2941SSLM04404600353250011002356520
    LM2941TSLM04404600353250011002356520

    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 LM2941.

    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 LM2941 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2941-ADJ MDC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941-ADJ MWC
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J-MLS
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J-QMLV
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941J/883
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM2941K-MLS
    		NONE
    		NONE
    		09 Mar 1999
    LM2941K/883
    		NONE
    		NONE
    		08 Sep 1999

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