National Semiconductor | High-performance Analog

 

 LP3881   
0.8A Fast-Response Ultra Low Dropout Linear Regulators 		Click link to Download

Features
  • Ultra low dropout voltage (75 mV @ 0.8A typ)
  • Low ground pin current
  • Load regulation of 0.04%/A
  • 60 nA typical quiescent current in shutdown
  • 1.5% output accuracy (25°C)
  • TO-220, TO-263 and PSOP-8 packages
  • Over temperature/over current protection
  • -40°C to +125°C junction temperature range

    • Description

    The LP3881 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.

    The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220, TO-263 and PSOP-8 packages.

    Dropout Voltage: 75 mV (typ) @ 0.8A load current.

    Ground Pin Current: 3 mA (typ) at full load.

    Shutdown Current: 60 nA (typ) when S/D pin is low.

    Precision Output Voltage: 1.5% room temperature accuracy.


    Applications

  • DSP Power Supplies
  • Server Core and I/O Supplies
  • PC Add-in-Cards
  • Local Regulators in Set-Top Boxes
  • Microcontroller Power Supplies
  • High Efficiency Power Supplies
  • SMPS Post-Regulators

    • Also Recommended
    LP38851▲New! National's LP38k Family Of High
    LP38855▲Performance LDOs Power Digital ICs
    LP38858▲See More At LDO.NATIONAL.COM



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLP3881 LP38851 LP38855 LP38858
    Output Current800 mA 800 mA 1500 mA 1500 mA
    Output Min1.2 Volt 0.80 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage1.575, 1.875, 1.291 Volt 0.915 Volt 1.38, 0.98 Volt 1.38, 0.98 Volt
    Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt
    Dropout Voltage0.075 Volt 0.115 Volt 0.130 Volt 0.18 Volt
    Adjustable OutputNo Yes No No
    Quiescent Current4 mA 10 mA 10 mA 10 mA
    On/Off PinYes Yes Yes No
    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 Voltage1.8, 1.2, 1.5 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt
    Output Max1.8, 1.2, 1.5 Volt 1.80 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt

    Datasheets
    TitleSizeDateOther
    Language
    LP3881 0.8A Fast-Response Ultra Low Dropout Linear Regulators750
    Kbytes    		21-Jun-06   

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP3881ES-1.2/NOPB

    LP3881ES-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide15
    AVNET-EMWorldwide180
    DIGI-KEYWorldwide163
    MOUSERWorldwide175
    NEWARKAmericas37
    RS COMPONENTSWorldwide14
    TAYLORAmericas15
    		$1.98 each at 1K+ pcsrail
    of
    45
    LP3881ES-1.5/NOPB

    LP3881ES-1.5

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide80
    DIGI-KEYWorldwide171
    MOUSERWorldwide180
    RS COMPONENTSWorldwide45
    		$1.98 each at 1K+ pcsrail
    of
    45
    LP3881ES-1.8/NOPB

    LP3881ES-1.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide228
    MOUSERWorldwide180
    RS COMPONENTSWorldwide38
    		$1.98 each at 1K+ pcsrail
    of
    45
    LP3881ESX-1.2/NOPB

    LP3881ESX-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    TECHMOSAAsia Pacific1500
    		$1.98 each at 1K+ pcsreel
    of
    500
    LP3881ESX-1.8/NOPB

    LP3881ESX-1.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.98 each at 1K+ pcsreel
    of
    500

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LP3881EMR-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMR-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMR-1.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMRX-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ESX-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.8
    		NONE
    		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 LP3881.

    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 LP3881 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LP3881ES-1.2/NOPB

    LP3881ES-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP3881ES
    -1.2
    LP3881ES-1.5/NOPB

    LP3881ES-1.5
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP3881ES
    -1.5
    LP3881ES-1.8/NOPB

    LP3881ES-1.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP3881ES
    -1.8
    LP3881ESX-1.2/NOPB

    LP3881ESX-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP3881ES
    -1.2
    LP3881ESX-1.8/NOPB

    LP3881ESX-1.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP3881ES
    -1.8

    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 LP3881.

    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 LP3881 is located at RoHS Status.

    CAD Symbols and Models
    Download LP3881 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP3881ES-1.2CS065247473430552700011568301341
    LP3881ES-1.5CS065247473430552700011568301341
    LP3881ES-1.8CS065247473430552700011568301341
    LP3881ESX-1.2CS065247473430552700011568301341
    LP3881ESX-1.8CS065247473430552700011568301341

    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 LP3881.

    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 LP3881 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LP3881EMR-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMR-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMR-1.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881EMRX-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ESX-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.2
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3881ET-1.8
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

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