National Semiconductor | High-performance Analog

 

 LM2695   

High Voltage (30V, 1.25A) Step Down Switching Regulator
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Features
  • Integrated 33V, N-Channel buck switch
  • Integrated start-up regulator
  • Input Voltage Range: 8V to 30V
  • No loop compensation required
  • Ultra-Fast transient response
  • Operating frequency remains constant with load current and input voltage
  • Maximum Duty Cycle Limited During Start-Up
  • Adjustable output voltage
  • Valley Current Limit At 1.25A
  • Precision internal reference
  • Low bias current
  • Highly efficient operation
  • Thermal shutdown
  • Description

    The LM2695 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 33V N-Channel Buck Switch, and is available in the thermally enhanced LLP-10 and TSSOP-14EP packages. The hysteretic regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The current limit detection is set at 1.25A. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.


    Applications

  • High Efficiency Point-Of-Load (POL) Regulator
  • Non-Isolated Telecommunication Buck Regulator
  • Secondary High Voltage Post Regulator
  • Also Recommended
    LM2694Lower Current Version, 600mA



    Typical Application
    click for larger image


    Block Diagram
    *click for larger image


    Parameters / ValuesLM2695 LM2694
    Output Current1250 mA 600 mA
    Input Min Voltage8 Volt 8 Volt
    Input Max Voltage30 Volt 30 Volt
    Output Min2.5 Volt 2.5 Volt
    Output Max24 Volt 24 Volt
    Frequency Min50 kHz 50 kHz
    Frequency Max800 kHz 1000 kHz
    Efficiency (peak)96 % 93 %
    On/Off PinYes Yes
    PowerGood / Error FlagNo No
    SoftStartYes Yes
    Sync PinNo No
    InvertingYes Yes
    FlybackNo No
    RegTypeSwitching Regulator Switching Regulator
    Temperature Min-40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C
    Adjustable OutputYes Yes
    Adj Switch FrequencyYes Yes
    PWM ModeConstant on-time Constant on-time
    TopologyBuck Buck
    Special FeaturesNo compensation required, ultra-fast transient response No compensation required, ultra-fast transient response
    Step-DownYes Yes
    Multiple Output CapabilityNo No
    Output PowerUndefined Watt Undefined Watt
    Output VoltageUndefined Volt Undefined Volt
    Output Range2.5V to 24V 2.5V to 24V
    Switching Frequency1000 kHz 1000 kHz
    Feedback Voltage2.5 Volt
    Regulator FamilyUndefined Undefined
    Synchronous RectificationNo No

    Datasheets
    TitleSizeDateOther
    Language
    LM2695 High Voltage (30V, 1.25A) Step Down Switching Regulator634
    Kbytes
    10-Jan-06日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1444: Application Note 1444 LM2695 Evaluation Board716
    Kbytes
    15-Feb-06 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2695MH/NOPB

    LM2695MH

    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide282
    DIGI-KEYWorldwide896
    MOUSERWorldwide282
    RS COMPONENTSWorldwide30
    TAYLORAmericas282
    $1.40 each at 1K+ pcsrail
    of
    94
    LM2695MHX/NOPB

    LM2695MHX

    RoHS Status


    TSSOP EXP PAD
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.40 each at 1K+ pcsreel
    of
    2500
    LM2695SD/NOPB

    LM2695SD

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1000
    MOUSERWorldwide1000
    RS COMPONENTSWorldwide45
    $1.40 each at 1K+ pcsreel
    of
    1000
    LM2695SDX/NOPB

    LM2695SDX

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.40 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 LM2695.

    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 LM2695 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2695EVAL
    High Voltage (30V, 1.25A) Step Down Switching RegulatorFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $42.80 each1

    Description:

    LM2695 High Voltage (30V, 1.25A) Step Down Switching Regulator

    Features:

    • Integrated 33V, N-Channel buck switch
    • Integrated start-up regulator
    • Input voltage range: 8V to 30V
    • No loop compensation required
    • Ultra-Fast transient response
    • Operating frequency remains constant with load current and input voltage
    • Maximum Duty Cycle limited during start-up
    • Adjustable output voltage
    • Valley Current Limit at 1.25A
    • Precision internal reference
    • Low bias current
    • Highly efficient operation
    • Thermal shutdown

    Applications:

    • High Efficiency Point-O-Load (POL) Regulator
    • Non-Isolated Telecommunications Buck Regulator
    • Secondary High Voltage Post Regulator

    Contents:

    • A fully assembled LM2695 evaluation board
    • LM2695 datasheet
    • LM2695 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
    LM2695MH/NOPB

    LM2695MH
    53.783
    54.004
    TSSOP EXP PAD141
    1
    260
    260
    DetailDownloadN/A
    NSUZXYTT
    L2695
    MH
    LM2695MHX/NOPB

    LM2695MHX
    53.783
    54.004
    TSSOP EXP PAD141
    1
    260
    260
    DetailDownloadN/A
    NSUZXYTT
    L2695
    MH
    LM2695SD/NOPB

    LM2695SD
    39.757
    39.906
    LLP101
    1
    260
    260
    DetailDownloadN/A
    NS
    UZXYTT
    L2695SD
    LM2695SDX/NOPB

    LM2695SDX
    39.757
    39.906
    LLP101
    1
    260
    260
    DetailDownloadN/A
    NS
    UZXYTT
    L2695SD

    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 LM2695.

    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 LM2695 is located at RoHS Status.

    CAD Symbols and Models
    Download LM2695 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2695MHABCD15004268000639400011814314958
    LM2695MHXABCD15004268000639400011814314958
    LM2695SDABCD15004268000639400011814314958
    LM2695SDXABCD15004268000639400011814314958

    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 LM2695.

    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 LM2695 is located at RoHS Status.

    [Information as of 8-Feb-2012]