National Semiconductor | High-performance Analog

 

 LP38853   

3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start from the PowerWise® Family
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Features

  • Adjustable VOUT range of 0.80V to 1.8V
  • Wide VBIAS Supply operating range of 3.0V to 5.5V
  • Stable with 10µF Ceramic capacitors
  • Dropout voltage of 240 mV (typical) at 3A load current
  • Precision VADJ across all line and load conditions:
  • ±1.5% VADJ for TJ = 25°C
  • ±2.0% VADJ for 0°C TJ +125°C
  • ±3.0% VADJ for -40°C TJ +125°C
  • Over-Temperature and Over-Current protection
  • Available in 8 lead PSOP, 7 lead TO-220 and 7 lead TO-263 packages
  • −40°C to +125°C Operating Junction Temperature Range
  • Description

    The LP38853-ADJ is a high current, fast response regulator which can maintain output voltage regulation with extremely low 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 this device makes it suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The part is available in PSOP 8–pin, TO-220 7–pin, and TO-263 7-pin packages.

    Dropout Voltage: 240 mV (typical) at 3A load current.

    Low Ground Pin Current: 10 mA (typical) at 3A load current.

    Soft-Start: Programmable Soft-Start time.

    Precision ADJ Voltage: ±1.5% for TJ = 25°C, and ±2.0% for 0°C TJ +125°C, across all line and load conditions


    Applications

  • ASIC Power Supplies in:

  • - Desktops, Notebooks, and Graphics Cards, Servers

  • - Gaming Set Top Boxes, Printers and Copiers
  • Server Core and I/O Supplies
  • DSP and FPGA Power Supplies
  • SMPS Post-Regulator
  • WEBENCH® LP38853
        Min   Max   Range  
      VIN V    1.25 – 5.50V  
      VOUT V    0.80 – 1.80V  
      IOUT A    ≤ 3.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LP388521.5A Version
    LP38856Fixed 0.8V & 1.2V, Enable Only
    LP38859Fixed 0.8V & 1.2V, Soft-start Only



    Typical Application
    *click for larger image


    Block Diagram
    *click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLP38853 LP38852 LP38856 LP38859
    Output Current3000 mA 1500 mA 3000 mA 3000 mA
    Output Min0.8 Volt 0.8 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage1.04 Volt 0.93 Volt 1.55, 1.15 Volt 1.55, 1.15 Volt
    Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt
    Dropout Voltage0.240 Volt 0.130 Volt 0.240 Volt 0.35 Volt
    Adjustable OutputYes Yes No No
    Quiescent Current10 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
    Special FeaturesDual Rail, Soft-Start Dual Rail, Soft-Start
    Output Max1.8 Volt 1.8 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt
    Feedback Voltage0.500 Volt 0.500 Volt
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LP38853 3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start465
    Kbytes
    13-Sep-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1504: Application Note 1504 LP38853S-ADJ Evaluation Board573
    Kbytes
    13-Mar-07 中文
    AN-1560: Application Note 1560 LP38852MR-ADJ Evaluation Board280
    Kbytes
    17-Mar-07 中文
    AN-1815: Application Note 1815 LDOs Ease the Stress of Start-Up149
    Kbytes
    23-Sep-08 


    Other Technical Documents
    TitleTypeDate
    How to Power Sub-Micron CMOS Loads with an Efficient LDOExternal Article 2007-06-13

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38853MR-ADJ/NOPB

    LP38853MR-ADJ

    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide255
    CEACAsia Pacific950
    DIGI-KEYWorldwide174
    FARNELLEurope and Asia181
    $2.00 each at 1K+ pcsrail
    of
    95
    LP38853MRX-ADJ/NOPB

    LP38853MRX-ADJ

    RoHS Status


    PSOP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $2.00 each at 1K+ pcsreel
    of
    2500
    LP38853S-ADJ/NOPB

    LP38853S-ADJ

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide89
    AVNET-EMWorldwide223
    DIGI-KEYWorldwide125
    FARNELLEurope and Asia120
    MOUSERWorldwide215
    NEWARKAmericas79
    RS COMPONENTSWorldwide1
    TAYLORAmericas89
    $2.00 each at 1K+ pcsrail
    of
    45
    LP38853SX-ADJ/NOPB

    LP38853SX-ADJ

    RoHS Status


    TO-263
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $2.00 each at 1K+ pcsreel
    of
    500
    LP38853T-ADJ/NOPB

    LP38853T-ADJ

    RoHS Status


    TO-220
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide120
    DIGI-KEYWorldwide258
    MOUSERWorldwide225
    RS COMPONENTSWorldwide1
    TAYLORAmericas120
    $2.00 each at 1K+ pcsrail
    of
    45

    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 LP38853.

    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 LP38853 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38853EVAL
    Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-StartFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $37.50 each1

    Features:

    • Adjustable VOUT range of 0.80V to 1.8V
    • Wide VBIAS Supply operating range of 3.0V to 5.5V
    • Stable with 10µF Ceramic capacitors
    • Dropout voltage of 240 mV (typical) at 3A load current
    • Precision VADJ across all line and load conditions:
           - ± 1.5% VADJ for TJ = 25°C
           - ± 2.0% VADJ for 0°C ≤ T, ≤ +125°C
           - ± 3.0% VADJ for -40°C ≤ T, ≤ +125°C
    • Over-Temperature and Over-Current protection
    • -40°C to +125°C Operating Junction Temperature Range

    Applications:

    • ASIC Power Supplies In:
           - Desktops, Notebooks, and Graphics Cards, Servers
           - Gaming Set Top Boxes, Printers and Copiers
    • Server Core and I/O Supplies
    • DSP and FPGA Power Supplies
    • SMPS Post-Regulator

    Contents:

    • A LP38853 Fully Assembled Evaluation Board
    • A LP38853 Datasheet
    • A LP38853 Evaluation Board Appnote



    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LP38853MR-ADJ/NOPB

    LP38853MR-ADJ
    77.907
    78.13
    PSOP83
    3
    260
    260
    DetailDownloadN/A
    NSXYTT
    L38853
    MRADJ
    LP38853MRX-ADJ/NOPB

    LP38853MRX-ADJ
    77.907
    78.13
    PSOP83
    3
    260
    260
    DetailDownloadN/A
    NSXYTT
    L38853
    MRADJ
    LP38853S-ADJ/NOPB

    LP38853S-ADJ
    1608.332
    1609.822
    TO-26373
    3
    245
    235
    DetailDownloadN/A
    NSUZXYTTE#
    LP38853S
    ADJ
    LP38853SX-ADJ/NOPB

    LP38853SX-ADJ
    1608.332
    1609.822
    TO-26373
    3
    245
    235
    DetailDownloadN/A
    NSUZXYTTE#
    LP38853S
    ADJ
    LP38853T-ADJ/NOPB

    LP38853T-ADJ
    1846.782
    1858.793
    TO-22071
    1
    NA
    NA
    DetailDownloadN/A
    NSUZXYTTE#
    LP38853T
    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 LP38853.

    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 LP38853 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    Article - How to Power Sub-Micron CMOS Loads with an Efficient LDO  

    CAD Symbols and Models
    Download LP38853 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP38853MR-ADJCS065247473430552700011568301341
    LP38853MRX-ADJCS065247473430552700011568301341
    LP38853S-ADJCS065247473430552700011568301341
    LP38853SX-ADJCS065247473430552700011568301341
    LP38853T-ADJCS065247473430552700011568301341

    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 LP38853.

    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 LP38853 is located at RoHS Status.

    [Information as of 9-Feb-2012]