National Semiconductor | High-performance Analog

 

 LP38852   
1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start from the PowerWise® Family		 Click link to Download

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 130 mV (typical) at 1.5A load current
  • Precision Output Voltage 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 LP38852-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 the TO-220 and TO-263 7-pin packages.

    Dropout Voltage: 130 mV (typical) at 1.5A load current.

    Low Ground Pin Current: 10 mA (typical) at 1.5A 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® LP38852
        Min   Max   Range  
      VIN – V    0.98 – 5.50V  
      VOUT V    0.80 – 1.80V  
      IOUT A    ≤ 1.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LP38853▲3A Version
    LP38855▲Fixed 0.8V & 1.2V, Enable Only
    LP38858▲Fixed 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 / ValuesLP38852 LP38853 LP38855 LP38858
    Output Current1500 mA 3000 mA 1500 mA 1500 mA
    Output Min0.8 Volt 0.8 Volt 1.2, 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage0.93 Volt 1.04 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 Voltage0.130 Volt 0.240 Volt 0.130 Volt 0.18 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
    LP38852 1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start434
    Kbytes    		25-Oct-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    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 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38852MR-ADJ/NOPB

    LP38852MR-ADJ

    RoHS Status

    PSOP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide124
    AVNET-EMWorldwide226
    DIGI-KEYWorldwide393
    NEWARKAmericas811
    TAYLORAmericas124
    		$1.10 each at 1K+ pcsrail
    of
    95
    LP38852MRX-ADJ/NOPB

    LP38852MRX-ADJ

    RoHS Status

    PSOP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    2500
    LP38852S-ADJ/NOPB

    LP38852S-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide921
    AVNET-EMWorldwide108
    DIGI-KEYWorldwide412
    FARNELLEurope and Asia119
    NEWARKAmericas119
    TAYLORAmericas921
    		$1.10 each at 1K+ pcsrail
    of
    45
    LP38852SX-ADJ/NOPB

    LP38852SX-ADJ

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide500
    DIGI-KEYWorldwide0
    MOUSERWorldwide500
    TAYLORAmericas1000
    		$1.10 each at 1K+ pcsreel
    of
    500
    LP38852T-ADJ/NOPB

    LP38852T-ADJ

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide345
    DIGI-KEYWorldwide233
    MOUSERWorldwide270
    TAYLORAmericas345
    		$1.10 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 LP38852.

    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 LP38852 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38852EVAL
    		LP38852 1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-StartFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$37.50 each1

    Features:

    • Adjustable VOUT randge of 0.80V to 1.8V
    • Wide VBIAS Supply operating range of 3.0V to 5.5V
    • Stable with 10µF Ceramic capacitors
    • Dropout voltageof 130mV (typical) at 1.5A load current
    • Precision Output Voltage 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

    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 fully assembled LP38852 evaluation board
    • LP38852 datasheet
    • LP38852 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
    LP38852MR-ADJ/NOPB

    LP38852MR-ADJ
    		77.907
    78.13
    		PSOP83
    3    		260
    260    		DetailDownloadN/A
    		NSXYTT
    L38852
    MRADJ
    LP38852MRX-ADJ/NOPB

    LP38852MRX-ADJ
    		77.907
    78.13
    		PSOP83
    3    		260
    260    		DetailDownloadN/A
    		NSXYTT
    L38852
    MRADJ
    LP38852S-ADJ/NOPB

    LP38852S-ADJ
    		1608.332
    1609.822
    		TO-26373
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38852S
    -ADJ
    LP38852SX-ADJ/NOPB

    LP38852SX-ADJ
    		1608.332
    1609.822
    		TO-26373
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38852S
    -ADJ
    LP38852T-ADJ/NOPB

    LP38852T-ADJ
    		1846.782
    1858.793
    		TO-22071
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38852T
    -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 LP38852.

    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 LP38852 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 LP38852 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP38852MR-ADJCS065247473430552700011568301341
    LP38852MRX-ADJCS065247473430552700011568301341
    LP38852S-ADJCS065247473430552700011568301341
    LP38852SX-ADJCS065247473430552700011568301341
    LP38852T-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 LP38852.

    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 LP38852 is located at RoHS Status.

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