National Semiconductor | High-performance Analog

 

 LP38855   
1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable from the PowerWise® Family		 Click link to Download

Features

  • Standard VOUT values of 0.8V and 1.2V
  • Wide VBIAS Supply operating range of 3.0V to 5.5V
  • Stable with 10 µF ceramic capacitors
  • Dropout voltage of 130 mV (typical) at 1.5A load current
  • Precision Output Voltage across all line and load conditions:

  • ±1.0% for TJ = 25°C
  • ±2.0% for 0°C ≤ TJ ≤ +125°C
  • ±3.0% for -40°C ≤ TJ ≤ +125°C
  • Over-Temperature and Over-Current protection
  • Available in 5 lead TO-220 and TO-263 packages
  • Custom VOUT values between 0.8V and 1.2V are available
  • -40°C to +125°C Operating Temperature Range

    • Description

    The LP38855 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides power for the internal bias and control circuits, as well as drive for the gate of the N-MOS power transistor, while VIN 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 LP38855 is available in TO-220 and TO-263 5-Lead packages.

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

    Low Ground Pin Current: 10 mA (typical) at 1.5A load current.

    Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low.

    Precision Output Voltage: ±1.0% 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® LP38855
        Min   Max   Range  
      VIN – V    0.98 – 5.50V  
      VOUT V    0.80 – 0.80V  
      IOUT A    ≤ 1.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LP38852▲1.5A Adjustable Version
    LP38853▲3A Adjustable Version
    LP38858▲Fixed 0.8V & 1.2V With Soft-start



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image

    Block Diagram


    Typical Performance
    *click for larger image


    Parameters / ValuesLP38855 LP38852 LP38853 LP38858
    Output Current1500 mA 1500 mA 3000 mA 1500 mA
    Output Min1.2, 0.8 Volt 0.8 Volt 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage1.38, 0.98 Volt 0.93 Volt 1.04 Volt 1.38, 0.98 Volt
    Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt
    Dropout Voltage0.130 Volt 0.130 Volt 0.240 Volt 0.18 Volt
    Adjustable OutputNo Yes Yes 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
    Output Voltage1.2, 0.8 Volt 1.2, 0.8 Volt
    Output Max1.2, 0.8 Volt 1.8 Volt 1.8 Volt 1.2, 0.8 Volt
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LP38855 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable353
    Kbytes    		25-Oct-11   

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38855S-0.8/NOPB

    LP38855S-0.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide140
    MOUSERWorldwide270
    		$1.00 each at 1K+ pcsrail
    of
    45
    LP38855S-1.2/NOPB

    LP38855S-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide560
    AVNET-EMWorldwide316
    DIGI-KEYWorldwide383
    NEWARKAmericas234
    TAYLORAmericas560
    		$1.00 each at 1K+ pcsrail
    of
    45
    LP38855SX-0.8/NOPB

    LP38855SX-0.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.00 each at 1K+ pcsreel
    of
    500
    LP38855SX-1.2/NOPB

    LP38855SX-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.00 each at 1K+ pcsreel
    of
    500
    LP38855T-0.8/NOPB

    LP38855T-0.8

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide270
    		$1.00 each at 1K+ pcsrail
    of
    45
    LP38855T-1.2/NOPB

    LP38855T-1.2

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide105
    DIGI-KEYWorldwide201
    MOUSERWorldwide268
    		$1.00 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 LP38855.

    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 LP38855 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LP38855S-0.8/NOPB

    LP38855S-0.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855S
    -0.8
    LP38855S-1.2/NOPB

    LP38855S-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855S
    -1.2
    LP38855SX-0.8/NOPB

    LP38855SX-0.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855S
    -0.8
    LP38855SX-1.2/NOPB

    LP38855SX-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855S
    -1.2
    LP38855T-0.8/NOPB

    LP38855T-0.8
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855T
    -0.8
    LP38855T-1.2/NOPB

    LP38855T-1.2
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38855T
    -1.2

    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 LP38855.

    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 LP38855 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 LP38855 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP38855S-0.8CS065247473430552700011568301341
    LP38855S-1.2CS065247473430552700011568301341
    LP38855SX-0.8CS065247473430552700011568301341
    LP38855SX-1.2CS065247473430552700011568301341
    LP38855T-0.8CS065247473430552700011568301341
    LP38855T-1.2CS065247473430552700011568301341

    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 LP38855.

    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 LP38855 is located at RoHS Status.

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