National Semiconductor | High-performance Analog

 

 LM2831   
High Frequency 1.5A Load - Step-Down DC-DC Regulator 		Click link to Download

Features

  • Space Saving SOT23-5 Package
  • Input voltage range of 3.0V to 5.5V
  • Output voltage range of 0.6V to 4.5V
  • 1.5A output current
  • High Switching Frequencies

  •  1.6MHz (LM2831X)

  •  0.55MHz (LM2831Y)

  •  3.0MHz (LM2831Z)
  • 130mΩ PMOS switch
  • 0.6V, 2% Internal Voltage Reference
  • Internal soft-start
  • Current mode, PWM operation
  • Thermal Shutdown
  • Over voltage protection

    • Description

    The LM2831 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT23 and a 6 Pin LLP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5A loads with an internal 130 mΩ PMOS switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.6V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.


    Applications

  • Local 5V to Vcore Step-Down Converters
  • Core Power in HDDs
  • Set-Top Boxes
  • USB Powered Devices
  • DSL Modems

    • WEBENCH® LM2831X
        Min   Max   Range  
      Vin V    3.00 – 5.50V  
      Vout V    0.60 – 4.50V  
      Iout A    ≤ 1.50A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
     
     
     
     
    What are WEBENCH® tools?

    Also Recommended
    LM2830▲1.0A Version
    LM2832▲2.0A Version



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM2831 LM2830 LM2832
    Output Current1500 mA 1000 mA 2000 mA
    Input Min Voltage3 Volt 3 Volt 3 Volt
    Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt
    Output Min0.6 Volt 0.6 Volt 0.6 Volt
    Output Max4.5 Volt 4.5 Volt 4.5 Volt
    Frequency Min3000, 1600, 550 kHz 3000, 1600 kHz 300, 1600, 550 kHz
    Frequency Max3000, 1600, 550 kHz 3000, 1600 kHz 3000, 1600, 550 kHz
    Efficiency (peak)93 % 93 % 93 %
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    SoftStartYes Yes Yes
    Sync PinNo No No
    InvertingNo No No
    FlybackNo No No
    RegTypeSwitching Regulator Switching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 125 deg C
    Adjustable OutputYes Yes Yes
    Adj Switch FrequencyNo No No
    PWM ModeCurrent Current Current
    TopologyBuck Buck Buck
    Special FeaturesInternal compensation Internal compensation Internal compensation
    Step-DownYes Yes Yes
    Multiple Output CapabilityNo No No
    Output PowerUndefined Watt Undefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt Undefined Volt
    Output Range0.6V to 4.5V 0.6V to 4.5V 0.6V to 4.5V
    Switching Frequency3000, 1600, 550 kHz 3000, 1600 kHz 3000, 1600, 550 kHz
    Feedback VoltageUndefined Volt Undefined Volt Undefined Volt
    Regulator FamilyUndefined Undefined Undefined
    AutomotiveYes Yes Yes
    Synchronous RectificationNo No No

    Datasheets
    TitleSizeDateOther
    Language
    LM2831 High Frequency 1.5A Load - Step-Down DC-DC Regulator511
    Kbytes    		17-Jan-12日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1550: Application Note 1550 LM2831X 6-Pin LLP Demo Board1727
    Kbytes    		8-Jan-09 


    Other Technical Documents
    TitleTypeDate
    Best Layout Practices for Switching Power SuppliesPower Designer 2007-03-21
    Calculating Losses and Junction Temperature for High-Power-Density Switching ConvertersPower Designer 2007-11-30

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2831XMF/NOPB

    LM2831XMF

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide3078
    DIGI-KEYWorldwide3868
    FARNELLEurope and Asia10
    MOUSERWorldwide1239
    NEWARKAmericas110
    RS COMPONENTSWorldwide31
    TAYLORAmericas3078
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831XMFX/NOPB

    LM2831XMFX

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide3000
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    3000
    LM2831XSD/NOPB

    LM2831XSD

    RoHS Status

    LLP    		Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1950
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide2026
    MOUSERWorldwide1000
    NEWARKAmericas31
    TAYLORAmericas1950
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831XSDX/NOPB

    LM2831XSDX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    4500
    LM2831YMF/NOPB

    LM2831YMF

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1270
    DIGI-KEYWorldwide2303
    FARNELLEurope and Asia988
    MOUSERWorldwide852
    NEWARKAmericas232
    RS COMPONENTSWorldwide1120
    TAYLORAmericas1270
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831YMFX/NOPB

    LM2831YMFX

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    3000
    LM2831YSD/NOPB

    LM2831YSD

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide717
    DIGI-KEYWorldwide999
    MOUSERWorldwide1000
    TAYLORAmericas717
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831YSDX/NOPB

    LM2831YSDX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    4500
    LM2831ZMF/NOPB

    LM2831ZMF

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1500
    DIGI-KEYWorldwide1285
    FARNELLEurope and Asia1703
    MOUSERWorldwide840
    NEWARKAmericas678
    RS COMPONENTSWorldwide11
    TAYLORAmericas1500
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831ZMFX/NOPB

    LM2831ZMFX

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    3000
    LM2831ZSD/NOPB

    LM2831ZSD

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1622
    MOUSERWorldwide770
    TAYLORAmericas1000
    		$1.09 each at 1K+ pcsreel
    of
    1000
    LM2831ZSDX/NOPB

    LM2831ZSDX

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.09 each at 1K+ pcsreel
    of
    4500

    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 LM2831.

    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 LM2831 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2831XMF EVAL
    		High Frequency 1.5A Load - Step-Down DC-DC RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide12
    FARNELLEurope and Asia1
    NEWARKAmericas1
    		$30.00 each1

    Description:

    LM2831 High Frequency (1.6 MHz) 1.5A Load - Step-Down DC-DC Regulator

    Features:

    • Space saving SOT23-5 Package
    • Input voltage range of 3.0V to 5.5V
    • Output voltage range of 0.6V to 4.5V
    • 1.5A output current
    • High Switching Frequencies:
           1.6MHz (LM2831X)
           0.55MHz (LM2831Y)
           3.0MHz (LM2831Z)
    • 130mΩ PMOS switch
    • 0.6V, 2% Internal Voltage Reference
    • Internal soft-start
    • Current mode, PWM operation
    • Thermal Shutdown
    • Over voltage protection

    Applications:

    • Local 5V to Vcore Step-Down Converters
    • Core Power in HDDs
    • Set-Top Boxes
    • USB Powered Devices
    • DSL Modems

    Contents:

    • A fully assembled LM2831XMF evaluation board
    • LM2831 datasheet
    • LM2831 evaluation board appnote

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2831YMF EVAL
    		High Frequency 1.5A Load - Step-Down DC-DC RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$30.00 each1

    Description:

    LM2831 High Frequency (0.55Hz) 1.5A Load - Step-Down DC-DC Regulator

    Features:

    • Space Saving SOT23-5 Package
    • Input voltage range of 3.0V to 5.5V
    • Output voltage range of 0.6V to 4.5V
    • 1.5A output current
    • High Switching Frequencies:
           1.6MHz (LM2831X)
           0.55MHz (LM2831Y)
           3.0MHz (LM2831Z)
    • 130mΩ PMOS switch
    • 0.6V, 2% Internal Voltage Reference
    • Internal soft-start
    • Current mode, PWM operation
    • Thermal Shutdown
    • Over voltage protection

    Applications:

    • Local 5V to Vcore Step-Down Converters
    • Core Power in HDDs
    • Set-Top Boxes
    • USB Powered Devices
    • DSL Modems

    Contents:

    • A fully assembled LM2831YMF evaluation board
    • LM2831 datasheet
    • LM2831 evaluation board appnote

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2831ZMF EVAL
    		High Frequency 1.5A Load - Step-Down DC-DC RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$37.50 each1

    Description:

    LM2831 High Frequency (3.0MHz) 1.5A Load - Step-Down DC-DC Regulator

    Features:

    • Space Saving SOT23-5 Package
    • Input voltage range of 3.0V to 5.5V
    • Output voltage range of 0.6V to 4.5V
    • 1.5A output current
    • High Switching Frequencies:
           1.6MHz (LM2831X)
           0.55MHz (LM2831Y)
           3.0MHz (LM2831Z)
    • 130mΩ PMOS switch
    • 0.6V,2% Internal Voltage Reference
    • Internal soft-start
    • Current mode, PWM operation
    • Thermal Shutdown
    • Over voltage protection

    Applications:

    • Local 5V to Vcore Step-Down Converters
    • Core Power in HDDs
    • Set-Top Boxes
    • USB Powered Devices
    • DSL Modems

    Contents:

    • A fully assembledLM2831ZMF evaluation board
    • LM2831 datasheet
    • LM2831 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
    LM2831XMF/NOPB

    LM2831XMF
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SKYB
    XTT
    LM2831XMFX/NOPB

    LM2831XMFX
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SKYB
    XTT
    LM2831XSD/NOPB

    LM2831XSD
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L193B
    LM2831XSDX/NOPB

    LM2831XSDX
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L193B
    LM2831YMF/NOPB

    LM2831YMF
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SKZB
    XTT
    LM2831YMFX/NOPB

    LM2831YMFX
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SKZB
    XTT
    LM2831YSD/NOPB

    LM2831YSD
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L194B
    LM2831YSDX/NOPB

    LM2831YSDX
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L194B
    LM2831ZMF/NOPB

    LM2831ZMF
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SLAB
    XTT
    LM2831ZMFX/NOPB

    LM2831ZMFX
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		SLAB
    XTT
    LM2831ZSD/NOPB

    LM2831ZSD
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L195B
    LM2831ZSDX/NOPB

    LM2831ZSDX
    		21.032
    21.102
    		LLP63
    3    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L195B

    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 LM2831.

    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 LM2831 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2831 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2831XMFPVIP0500142800017550003497986041
    LM2831XMFXPVIP0500142800017550003497986041
    LM2831XSDPVIP0500142800017550003497986041
    LM2831XSDXPVIP0500142800017550003497986041
    LM2831YMFPVIP0500142800017550003497986041
    LM2831YMFXPVIP0500142800017550003497986041
    LM2831YSDPVIP0500142800017550003497986041
    LM2831YSDXPVIP0500142800017550003497986041
    LM2831ZMFPVIP0500142800017550003497986041
    LM2831ZMFXPVIP0500142800017550003497986041
    LM2831ZSDPVIP0500142800017550003497986041
    LM2831ZSDXPVIP0500142800017550003497986041

    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 LM2831.

    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 LM2831 is located at RoHS Status.

    [Information as of 8-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation