National Semiconductor | High-performance Analog

 

 LM25088   
Wide Input Range Non-Synchronous Buck Controller from the PowerWise® Family		 Click link to Download

Features

  • LM25088Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to +125°C operating junction temperature)
  • Emulated current mode control
  • Drives external high-side N-channel MOSFET
  • Ultra-wide input voltage range from 4.5V to 42V
  • Low IQ Shutdown and Standby modes
  • High duty cycle ratio feature for reduced dropout voltage
  • Spread spectrum EMI reduction (LM25088-1)
  • Hiccup timer for overload protection (LM25088-2)
  • Adjustable output voltage from 1.205V with 1.5% feedback reference accuracy
  • Wide bandwidth error amplifier
  • Single resistor oscillator frequency setting
  • Oscillator synchronization capability
  • Programmable soft-start
  • High voltage, low dropout bias regulator
  • Thermal shutdown protection

    • Description

    The LM25088 high voltage non-synchronous buck controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM25088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 42V. This easy to use controller includes a level shifted gate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage/low output voltage applications. The LM25088 switching frequency is programmable from 50 kHz to 1 MHz.

    The LM25088 is available in two versions: The LM25088-1 provides a +/-5% frequency dithering function to reduce the conducted and radiated EMI, while the LM25088-2 provides a versatile restart timer for overload protection. Additional features include a low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator synchronization capability. The device is available in a thermally enhanced TSSOP-16EP pin package.

    WEBENCH® LM25088
        Min   Max   Range  
      VIN – V    4.50 – 42.00V  
      VOUT V    1.23 – 42.00V  
      IOUT A    ≤ 10.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM5088▲Higher Voltage Version Of LM25088; 4.5V To 75V
    LM5116▲Wide Range Synchronous Buck Controller; 6V To 100V



    Typical Application
    *click for larger image


    		Block Diagram
    *click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM25088 LM5088 LM5116
    Output Current10000 mA 10000 mA 20000 mA
    Input Min Voltage4.5 Volt 4.5 Volt 6 Volt
    Input Max Voltage42 Volt 75 Volt 100 Volt
    Frequency Min50 kHz 50 kHz 50 kHz
    Frequency Max1000 kHz 1000 kHz 1000 kHz
    Feedback Voltage1.205 Volt 1.205 Volt 1.215 Volt
    Feedback Tolerance1.5 % 1.5 % 1.5 %
    Efficiency (peak)97 % 97 % 95 %
    Adj Switch FrequencyYes Yes Yes
    Adjustable OutputYes Yes Yes
    Synchronous RectificationNo No Yes
    On/Off PinYes Yes Yes
    PowerGood / Error FlagNo No No
    SoftStartYes Yes Yes
    Sync PinYes Yes Yes
    InvertingNo No No
    FlybackNo No No
    Lossless Current SenseNo No Yes
    RegTypeSwitching Controller Switching Controller Switching Controller
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 125 deg C 150 deg C
    Special FeaturesSpread Spectrum EMI reduction (Lm5088-1), Hiccup Mode Restart (LM5088-2), Low Dropout Mode and Low Iq shutdown and standby currents Spread Spectrum EMI reduction (Lm5088-1), Hiccup Mode Restart (LM5088-2), Low Dropout Mode and Low Iq shutdown and standby currents High step-down ratio using emulated current mode control
    TopologyBuck Buck Buck
    PWM ModeEmulated Current Mode Emulated Current Mode Current
    Step-DownYes Yes Yes
    Step-UpNo No No
    Multiple Output CapabilityNo No No
    Output Max40 Volt 70 Volt 80 Volt
    Output Min1.205 Volt 1.205 Volt 1.215 Volt
    AutomotiveYes Yes Yes
    PowerWiseYes Yes Yes
    Quiescent Current3.2 mA 3.8 mA

    Datasheets
    TitleSizeDateOther
    Language
    LM25088 Wide Input Range Non-Synchronous Buck Controller553
    Kbytes    		14-Mar-11   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1931: Application Note 1931 LM25088 Evaluation Board242
    Kbytes    		8-Dec-08 


    Other Technical Documents
    TitleTypeDate
    Improve Power Converter Reliability Using Hiccup-Mode Current LimitingPower Designer 2009-05-11

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25088MH-1/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide80
    DIGI-KEYWorldwide130
    FARNELLEurope and Asia9
    MOUSERWorldwide104
    NEWARKAmericas59
    		$1.40 each at 1K+ pcsrail
    of
    92
    LM25088MH-2/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide176
    DIGI-KEYWorldwide92
    MOUSERWorldwide272
    TAYLORAmericas67
    		$1.40 each at 1K+ pcsrail
    of
    92
    LM25088MHX-1/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.40 each at 1K+ pcsreel
    of
    2500
    LM25088MHX-2/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.40 each at 1K+ pcsreel
    of
    2500
    LM25088QMH-1/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide171
    MOUSERWorldwide270
    		$1.61 each at 1K+ pcsrail
    of
    92
    LM25088QMH-2/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide276
    MOUSERWorldwide276
    		$1.61 each at 1K+ pcsrail
    of
    92
    LM25088QMHX-1/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.61 each at 1K+ pcsreel
    of
    2500
    LM25088QMHX-2/NOPB


    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.61 each at 1K+ pcsreel
    of
    2500

    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 LM25088.

    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 LM25088 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25088MH-1EVAL
    		LM25088-1 - Wide Input Range Non-Synchronous Buck Controller with DitheringFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia1
    MOUSERWorldwide2
    NEWARKAmericas1
    		$60.00 each1

    Description:

    The LM25088-1 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM25088 controller IC. The LM25088 evaluation board is available in two versions (like the LM25088 controller): the LM25088-1 evaluation board provides ±5% oscillator frequency dithering to reduce EMI and the LM25088-2 evaluation board provides hiccup mode restart to reduce over load stress. Both the evaluation boards share the same layout except for silkscreen. The printed circuit board consists of 2 layers, 2 ounce of copper top and bottom and the board size is 2.55x1.5x0.5 inches

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25088MH-2EVAL
    		LM25088-2 - Wide Input Range Non-Synchronous Buck Controller with Hiccup Mode RestartFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia2
    MOUSERWorldwide1
    NEWARKAmericas2
    		$60.00 each1

    Description:

    The LM25088-2 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM5088 controller IC. The LM5088 evaluation board is available in two versions (like the LM25088 controller): the LM25088-1 evaluation board provides ±5% oscillator frequency dithering to reduce EMI and the LM25088-2 evaluation board provides hiccup mode restart to reduce over load stress. Both the evaluation boards share the same layout except for silkscreen. The printed circuit board consists of 2 layers, 2 ounce of copper top and bottom and the board size is 2.55x1.5x0.5 inches

    Contents:




    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
    LM25088MH-1/NOPB

    		56.396
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    MH-1
    LM25088MH-2/NOPB

    		56.396
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    MH-2
    LM25088MHX-1/NOPB

    		56.396
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    MH-1
    LM25088MHX-2/NOPB

    		56.396
    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    MH-2
    LM25088QMH-1/NOPB

    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    QMH-1
    LM25088QMH-2/NOPB

    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    QMH-2
    LM25088QMHX-1/NOPB

    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    QMH-1
    LM25088QMHX-2/NOPB

    		TSSOP EXP PAD161260DetailDownloadN/A
    		NSUZXYTT
    L25088
    QMH-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 LM25088.

    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 LM25088 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    LM(2)5088 Quick Start Calculator  

    CAD Symbols and Models
    Download LM25088 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM25088MH-1ABCD150XV1038680025950002736338335
    LM25088MH-2ABCD150XV1038680025950002736338335
    LM25088MHX-1ABCD150XV1038680025950002736338335
    LM25088MHX-2ABCD150XV1038680025950002736338335
    LM25088QMH-1ABCD150XV1038680025950002736338335
    LM25088QMH-2ABCD150XV1038680025950002736338335
    LM25088QMHX-1ABCD150XV1038680025950002736338335
    LM25088QMHX-2ABCD150XV1038680025950002736338335

    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 LM25088.

    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 LM25088 is located at RoHS Status.

    What's New in Power -- January 2009
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    What's New in Power -- January 2009
    Date: 2009-01-19
    Length: 0:04:57
    [Information as of 8-Feb-2012]
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