National Semiconductor | High-performance Analog

 

 LM1084   
5A 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

5A

Industrial Temperature Range

-40°C to 125°C

Line Regulation

0.015% (typical)

Load Regulation

0.1% (typical)

Description

The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1.5V at 5A of load current. It has the same pin-out as National Semiconductor's industry standard LM317.

The LM1084 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 intergrate the adjust resistors.

The LM1084 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The LM1084 series is available in TO-220 and TO-263 packages. Refer to the LM1085 for the 3A version, and the LM1086 for the 1.5A version.


Applications

  • Post Regulator for Switching DC/DC Conveter
  • High Efficiency Linear Regulators
  • Battery Charger

    • Also Recommended
    LM2677Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
    LM2678Switching Solution With Higher Efficiency , Wider Voltage Range , Shutdown Mode
    LM2679Switching Solution With Higher Efficiency , Wider Voltage Range , Adjustable Current Limit
    LM1085▲3A Version
    LM1086▲1.5A Version



    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM1084 LM1085 LM1086
    Output Current5000 mA 3000 mA 1500 mA
    Output Min1.25, 3.3, 5 Volt 3.3, 1.25, 12, 5 Volt 3.3, 1.25, 5, 2.5 Volt
    Input Min Voltage2.6 Volt 2.6 Volt 2.6 Volt
    Input Max Voltage25, 27, 29 Volt 25, 27, 18, 29 Volt 27, 25, 30, 29 Volt
    Dropout Voltage1.3 Volt 1.3 Volt 1.3 Volt
    Adjustable OutputNo No No
    Quiescent Current5 mA 5 mA 2 mA
    On/Off PinNo No No
    PowerGood / Error FlagNo No No
    RegTypeLDO LDO LDO
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C
    Output Max3.3, 27.5, 5 Volt 3.3, 27.5, 12, 5 Volt 3.3, 27.5, 5, 2.5 Volt
    Output Voltage3.3, 5 Volt 3.3, 12, 5 Volt 3.3, 5, 2.5 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LM1084 5A Low Dropout Positive Regulators750
    Kbytes    		6-Jun-05日本語  

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM1084IS-3.3/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide7
    AVNET-EMWorldwide163
    DIGI-KEYWorldwide356
    MOUSERWorldwide281
    NEWARKAmericas496
    RS COMPONENTSWorldwide64
    TAYLORAmericas952
    		$1.33 each at 1K+ pcsrail
    of
    45
    LM1084IS-5.0/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide666
    AVNET-EMWorldwide334
    DIGI-KEYWorldwide637
    MOUSERWorldwide290
    NEWARKAmericas15
    RS COMPONENTSWorldwide50
    TAYLORAmericas666
    		$1.33 each at 1K+ pcsrail
    of
    45
    LM1084IS-ADJ/NOPB

    LM1084IS-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide810
    AVNET-EMWorldwide1394
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia179
    MOUSERWorldwide235
    NEWARKAmericas1467
    RS COMPONENTSWorldwide330
    TAYLORAmericas810
    		$1.33 each at 1K+ pcsrail
    of
    45
    LM1084ISX-3.3/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide500
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    TAYLORAmericas500
    		$1.33 each at 1K+ pcsreel
    of
    500
    LM1084ISX-5.0/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide480
    DIGI-KEYWorldwide0
    MOUSERWorldwide498
    		$1.33 each at 1K+ pcsreel
    of
    500
    LM1084ISX-ADJ/NOPB


    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide484
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide475
    TAYLORAmericas484
    		$1.33 each at 1K+ pcsreel
    of
    500
    LM1084IT-3.3/NOPB


    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide245
    AVNET-EMWorldwide32
    DIGI-KEYWorldwide232
    MOUSERWorldwide232
    NEWARKAmericas288
    RS COMPONENTSWorldwide350
    TAYLORAmericas245
    		$1.33 each at 1K+ pcsrail
    of
    45
    LM1084IT-5.0/NOPB


    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide277
    DIGI-KEYWorldwide207
    MOUSERWorldwide126
    NEWARKAmericas26
    RS COMPONENTSWorldwide369
    		$1.33 each at 1K+ pcsrail
    of
    45
    LM1084IT-ADJ/NOPB

    LM1084IT-ADJ

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2127
    AVNET-EMWorldwide959
    DIGI-KEYWorldwide1864
    FARNELLEurope and Asia166
    MOUSERWorldwide111
    NEWARKAmericas2605
    RS COMPONENTSWorldwide500
    TAYLORAmericas2127
    		$1.33 each at 1K+ pcsrail
    of
    45

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM1084IS-12
    		LM1084IS-ADJ
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1084ISX-12
    		LM1084IS-ADJ
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1084IT-12
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 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 LM1084.

    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 LM1084 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM1084IS-3.3/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-3.3
    LM1084IS-5.0/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-5.0
    LM1084IS-ADJ/NOPB

    LM1084IS-ADJ
    		1289.225
    1289.976
    		TO-26333
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-ADJ
    LM1084ISX-3.3/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-3.3
    LM1084ISX-5.0/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-5.0
    LM1084ISX-ADJ/NOPB

    		1289.225
    1289.976
    		TO-26333245DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IS-ADJ
    LM1084IT-3.3/NOPB

    		1991.805
    1993.446
    		TO-22031NADetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IT-3.3
    LM1084IT-5.0/NOPB

    		1991.806
    1993.446
    		TO-22031NADetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IT-5.0
    LM1084IT-ADJ/NOPB

    LM1084IT-ADJ
    		1991.806
    1993.446
    		TO-22031
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LM1084
    IT-ADJ

    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 LM1084.

    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 LM1084 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM108X Qualification Package1455 Kbytes24-Jun-1999

    CAD Symbols and Models
    Download LM1084 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM1084IS-3.3LB30003437100416450011181688246
    LM1084IS-5.0LB30003437100416450011181688246
    LM1084IS-ADJLB30003437100416450011181688246
    LM1084ISX-3.3LB30003437100416450011181688246
    LM1084ISX-5.0LB30003437100416450011181688246
    LM1084ISX-ADJLB30003437100416450011181688246
    LM1084IT-3.3LB30003437100416450011181688246
    LM1084IT-5.0LB30003437100416450011181688246
    LM1084IT-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 LM1084.

    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 LM1084 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM1084IS-12
    		LM1084IS-ADJ
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1084ISX-12
    		LM1084IS-ADJ
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LM1084IT-12
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

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