National Semiconductor | High-performance Analog

 

 LP38856   
3A 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 240 mV (typical) at 3A 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 LP38856 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 LP38856 is available in TO-220 and TO-263 5-Lead packages.

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

    Low Ground Pin Current: 10 mA (typical) at 3A 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® LP38856
        Min   Max   Range  
      VIN – V    1.25 – 5.50V  
      VOUT V    0.80 – 0.80V  
      IOUT A    ≤ 3.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LP38852▲1.5A Adjustable Version
    LP38853▲3A Adjustable Version
    LP38859▲Fixed 0.8V & 1.2V With Soft-start



    Parameters / ValuesLP38856 LP38852 LP38853 LP38859
    Output Current3000 mA 1500 mA 3000 mA 3000 mA
    Output Min1.2, 0.8 Volt 0.8 Volt 0.8 Volt 1.2, 0.8 Volt
    Input Min Voltage1.55, 1.15 Volt 0.93 Volt 1.04 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 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
    LP38856 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable353
    Kbytes    		25-Oct-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1479: Application Note 1479 LP38856 3A LDO Linear Regulator with Enable468
    Kbytes    		3-Nov-06 中文

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38856S-0.8/NOPB

    LP38856S-0.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide225
    RS COMPONENTSWorldwide23
    		$2.00 each at 1K+ pcsrail
    of
    45
    LP38856S-1.2/NOPB

    LP38856S-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide515
    AVNET-EMWorldwide225
    DIGI-KEYWorldwide486
    MOUSERWorldwide170
    NEWARKAmericas175
    RS COMPONENTSWorldwide4
    TAYLORAmericas515
    		$2.00 each at 1K+ pcsrail
    of
    45
    LP38856SX-0.8/NOPB

    LP38856SX-0.8

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$2.00 each at 1K+ pcsreel
    of
    500
    LP38856SX-1.2/NOPB

    LP38856SX-1.2

    RoHS Status

    TO-263    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$2.00 each at 1K+ pcsreel
    of
    500
    LP38856T-0.8/NOPB

    LP38856T-0.8

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide225
    MOUSERWorldwide225
    RS COMPONENTSWorldwide45
    		$2.00 each at 1K+ pcsrail
    of
    45
    LP38856T-1.2/NOPB

    LP38856T-1.2

    RoHS Status

    TO-220    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide94
    MOUSERWorldwide160
    RS COMPONENTSWorldwide18
    		$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 LP38856.

    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 LP38856 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP38856-1.2EVAL
    		3A Fast-Response High-Accuracy LDO Linear Regulator with EnableFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$30.00 each1

    LP38856 3A Fast-Response High-Accuracy LDO Linear Regulator with Enable

    Features:

    • Standard VOUT values of 0.8V and 1.2V
    • Stable with 10 µF ceramic capacitors
    • Dropout voltage of 240 mV (typical) at 3A load current
    • Precision Output Voltage across all line and load conditions:
           - ±0% VOUT for TJ = 125°C
           - ±2.0% VOUT for 0°C ≤TJ ≤+125°C
           - ±3.0% VOUT 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

    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



    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
    LP38856S-0.8/NOPB

    LP38856S-0.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856S
    0.8
    LP38856S-1.2/NOPB

    LP38856S-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856S
    1.2
    LP38856SX-0.8/NOPB

    LP38856SX-0.8
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856S
    0.8
    LP38856SX-1.2/NOPB

    LP38856SX-1.2
    		1448.647
    1449.868
    		TO-26353
    3    		245
    235    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856S
    1.2
    LP38856T-0.8/NOPB

    LP38856T-0.8
    		1957.896
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856T
    0.8
    LP38856T-1.2/NOPB

    LP38856T-1.2
    		1905.986
    1908.876
    		TO-22051
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    LP38856T
    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 LP38856.

    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 LP38856 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 LP38856 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP38856S-0.8CS065247473430552700011568301341
    LP38856S-1.2CS065247473430552700011568301341
    LP38856SX-0.8CS065247473430552700011568301341
    LP38856SX-1.2CS065247473430552700011568301341
    LP38856T-0.8CS065247473430552700011568301341
    LP38856T-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 LP38856.

    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 LP38856 is located at RoHS Status.

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