National Semiconductor | High-performance Analog

 

 LM1085   
3A Low Dropout Positive Regulators 		Click link to Download

Features
  • Available in 3.3V, 5.0V, 12V and Adjustable Versions
  • Current Limiting and Thermal Protection

Output Current

3A

Line Regulation

0.015% (typical)

Load Regulation

0.1% (typical)

Description

The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1085 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions integrate the adjust resistors.

The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1085 series is available in TO-220 and TO-263 packages. Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.


Applications

  • High Efficiency Linear Regulators
  • Battery Charger
  • Post Regulation for Switching Supplies
  • Constant Current Regulator
  • Microprocessor Supply

    • Also Recommended
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    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM1085 LP38513 LP38853 LP38859
    Output Current3000 mA 3000 mA 3000 mA 3000 mA
    Output Min3.3, 1.25, 12, 5 Volt 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage2.6 Volt 2.25 Volt 1.04 Volt 1.55, 1.15 Volt
    Input Max Voltage25, 27, 18, 29 Volt 5.5 Volt 5.5 Volt 5.5 Volt
    Dropout Voltage1.3 Volt 0.425 Volt 0.240 Volt 0.35 Volt
    Adjustable OutputNo No Yes No
    Quiescent Current5 mA 10 mA 10 mA 10 mA
    On/Off PinNo Yes Yes 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 deg C 125 deg C 125 deg C 125 deg C
    Output Max3.3, 27.5, 12, 5 Volt 1.8 Volt 1.2, 0.8 Volt
    Output Voltage3.3, 12, 5 Volt 1.8 Volt 1.2, 0.8 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM1085 3A Low Dropout Positive Regulators744
    Kbytes    		6-Jun-05日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation200
    Kbytes    		10-May-04日本語
    中文

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM1085IS-12/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide225
    AVNET-EMWorldwide400
    DIGI-KEYWorldwide2729
    MOUSERWorldwide377
    NEWARKAmericas36
    RS COMPONENTSWorldwide40
    TAYLORAmericas225
    		$1.05 each at 1K+ pcsrail
    of
    45
    LM1085IS-3.3/NOPB

    LM1085IS-3.3

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide28
    AVNET-EMWorldwide2392
    DIGI-KEYWorldwide219
    NEWARKAmericas219
    RS COMPONENTSWorldwide103
    TAYLORAmericas7003
    TECHMOSAAsia Pacific180
    		$1.05 each at 1K+ pcsrail
    of
    45
    LM1085IS-5.0/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide124
    DIGI-KEYWorldwide968
    MOUSERWorldwide405
    NEWARKAmericas384
    RS COMPONENTSWorldwide529
    TAYLORAmericas973
    		$1.05 each at 1K+ pcsrail
    of
    45
    LM1085IS-ADJ/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1060
    AVNET-EMWorldwide1652
    DIGI-KEYWorldwide626
    FARNELLEurope and Asia133
    MOUSERWorldwide380
    RS COMPONENTSWorldwide516
    TAYLORAmericas1785
    		$1.05 each at 1K+ pcsrail
    of
    45
    LM1085ISX-3.3/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide831
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide486
    TAYLORAmericas6395
    		$1.05 each at 1K+ pcsreel
    of
    500
    LM1085ISX-5.0/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide950
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    TAYLORAmericas993
    		$1.05 each at 1K+ pcsreel
    of
    500
    LM1085ISX-ADJ/NOPB

    LM1085ISX-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide395
    TAYLORAmericas2398
    		$1.05 each at 1K+ pcsreel
    of
    500
    LM1085IT-12/NOPB


    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide315
    AVNET-EMWorldwide440
    DIGI-KEYWorldwide834
    MOUSERWorldwide405
    RS COMPONENTSWorldwide187
    TAYLORAmericas315
    		$0.99 each at 1K+ pcsrail
    of
    45
    LM1085IT-3.3/NOPB


    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide64
    AVNET-EMWorldwide1788
    DIGI-KEYWorldwide456
    MOUSERWorldwide377
    NEWARKAmericas196
    RS COMPONENTSWorldwide210
    TAYLORAmericas469
    		$0.99 each at 1K+ pcsrail
    of
    45
    LM1085IT-5.0/NOPB


    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide315
    DIGI-KEYWorldwide633
    MOUSERWorldwide214
    NEWARKAmericas96
    RS COMPONENTSWorldwide498
    TAYLORAmericas900
    		$0.99 each at 1K+ pcsrail
    of
    45
    LM1085IT-ADJ/NOPB

    LM1085IT-ADJ

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4806
    AVNET-EMWorldwide215
    DIGI-KEYWorldwide698
    FARNELLEurope and Asia1102
    MOUSERWorldwide1012
    NEWARKAmericas320
    RS COMPONENTSWorldwide765
    TAYLORAmericas4806
    		$0.99 each at 1K+ pcsrail
    of
    45
    LM1085I-ADJ MDC

    RoHS Status    		Full production
    Lead Time: 6 weeks

     

    Contact your distributor
    		CALLtray
    of
    N/A

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM1085I-3.3 MDC
    		LM1085I-ADJ MDC
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1085ISX-12
    		LM1085IS-ADJ
    		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 LM1085.

    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 LM1085 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM1085IS-12/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-12
    LM1085IS-3.3/NOPB

    LM1085IS-3.3
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-3.3
    LM1085IS-5.0/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-5.0
    LM1085IS-ADJ/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-ADJ
    LM1085ISX-3.3/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-3.3
    LM1085ISX-5.0/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-5.0
    LM1085ISX-ADJ/NOPB

    LM1085ISX-ADJ
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IS-ADJ
    LM1085IT-12/NOPB

    		1991.806
    1993.446
    		TO-22031NADetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IT-12
    LM1085IT-3.3/NOPB

    		1991.806
    1993.446
    		TO-22031NADetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IT-3.3
    LM1085IT-5.0/NOPB

    		1991.806
    1993.446
    		TO-22031NADetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IT-5.0
    LM1085IT-ADJ/NOPB

    LM1085IT-ADJ
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM1085
    IT-ADJ
    LM1085I-ADJ MDC
    		6.312
    		Unpackaged DieN/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 LM1085.

    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 LM1085 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM108X Qualification Package1455 Kbytes24-Jun-1999

    CAD Symbols and Models
    Download LM1085 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM1085I-ADJ MDCLB30003437100416450011181688246
    LM1085IS-12LB30003437100416450011181688246
    LM1085IS-3.3LB30003437100416450011181688246
    LM1085IS-5.0LB30003437100416450011181688246
    LM1085IS-ADJLB30003437100416450011181688246
    LM1085ISX-3.3LB30003437100416450011181688246
    LM1085ISX-5.0LB30003437100416450011181688246
    LM1085ISX-ADJLB30003437100416450011181688246
    LM1085IT-12LB30003437100416450011181688246
    LM1085IT-3.3LB30003437100416450011181688246
    LM1085IT-5.0LB30003437100416450011181688246
    LM1085IT-ADJLB30003437100416450011181688246

    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 LM1085.

    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 LM1085 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM1085I-3.3 MDC
    		LM1085I-ADJ MDC
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1085ISX-12
    		LM1085IS-ADJ
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

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