National Semiconductor | High-performance Analog

 

 LM25116   
Wide Range Synchronous Buck Controller from the PowerWise® Family		 Click link to Download

Features

  • Emulated peak current mode
  • Wide operating range up to 42V
  • Low IQ shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215V to 36V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft-start
  • Programmable line under-voltage lockout
  • Automatic switch to external bias supply
  • TSSOP-20EP exposed pad
  • Thermal shutdown

    • Description

    The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle by cycle current limiting and ease of loop compensation. 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 applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle by cycle current limit and adjustable line under-voltage lockout. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

    WEBENCH® LM25116
        Min   Max   Range  
      VIN – V    6.00 – 42.00V  
      VOUT V    1.22 – 36.00V  
      IOUT A    ≤ 20.00A  
      Ambient Temp °C    ≤ 100°C  
    Footprint BOM Cost Efficiency
    What are WEBENCH® tools?


    Also Recommended
    LM5116▲100V Input Voltage Max
    LM5116WG▲100V Input CERPACK-20 With No Thermal Shutdown
    LM5118Buck-Boost



    Typical Application
    click for larger image


    		Block Diagram
    *click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM25116 LM5116 LM5116WG
    Output Current20000 mA 20000 mA 20000 mA
    Input Min Voltage6 Volt 6 Volt 6 Volt
    Input Max Voltage42 Volt 100 Volt 100 Volt
    Feedback Voltage1.215 Volt 1.215 Volt 1.215 Volt
    Feedback Tolerance1.5 % 1.5 % 1.5 %
    Frequency Min50 kHz 50 kHz 50 kHz
    Frequency Max1000 kHz 1000 kHz 1000 kHz
    Efficiency (peak)95 % 95 % 95 %
    Output Range1.215V to 36V 1.215V to 80V 1.215V to 80V
    Adj Switch FrequencyYes Yes Yes
    Adjustable OutputYes Yes Yes
    Synchronous RectificationYes Yes 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 SenseYes Yes Yes
    RegTypeSwitching Controller Switching Controller Switching Controller
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max125 deg C 150 deg C 150 deg C
    Channels1 Channels 1 Channels 1 Channels
    Special FeaturesHigh step-down ratio using emulated current mode control High step-down ratio using emulated current mode control High step-down ratio using emulated current mode control
    TopologyBuck Buck Buck
    PWM ModeCurrent Current Current
    Step-DownYes Yes Yes
    Step-UpNo No No
    Output Max36 Volt 80 Volt 80 Volt
    Output Min1.215 Volt 1.215 Volt 1.215 Volt
    AutomotiveYes Yes Yes
    PowerWiseYes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM25116 Wide Range Synchronous Buck Controller641
    Kbytes    		9-Aug-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1596: Application Note 1596 LM5116 Evaluation Board299
    Kbytes    		18-May-07 
    AN-1617: Application Note 1617 LM25116 Evaluation Board314
    Kbytes    		10-Apr-07 
    AN-1628: Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter91
    Kbytes    		5-Sep-07日本語
    中文
    AN-1713: Application Note 1713 LM5116-12 Evaluation Board313
    Kbytes    		3-Oct-07 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25116MH/NOPB

    LM25116MH

    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide184
    AVNET-EMWorldwide64
    DIGI-KEYWorldwide602
    FARNELLEurope and Asia183
    NEWARKAmericas939
    TAYLORAmericas184
    		$2.50 each at 1K+ pcsrail
    of
    73
    LM25116MHX/NOPB

    LM25116MHX

    RoHS Status

    TSSOP EXP PAD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$2.50 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 LM25116.

    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 LM25116 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM25116EVAL/NOPB

    		Evaluation Board for LM25116 Wide Range Synchronous Buck ControllerFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide3
    		$70.50 each1

    Features:

    • Emulated peak current mode
    • Wide operating range up to 42V
    • Low IQ Shutdown (<10µA)
    • Drives standard or logic level MOSFETs
    • Robust 3.5A peak gate drive
    • Free-run or synchronous operation to 1MHz
    • Optional diode emulation mode
    • Programmable output from 1.215V to 36V
    • Precision 1.5% voltage reference
    • Programmable current limit
    • Programmable soft-start
    • Programmable line under-voltage lockout
    • Automatic switch to external bias supply
    • TSSOP-20EP exposed pad
    • Thermal shutdown

    Contents:

    • A LM25116 Fully Assembled Evaluation Board
    • A LM25116 Datasheet
    • A LM25116 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
    LM25116MH/NOPB

    LM25116MH
    		73.061
    73.592
    		TSSOP EXP PAD201
    1    		260
    260    		DetailDownloadN/A
    		NSUZXYTT
    LM25116
    MH
    LM25116MHX/NOPB

    LM25116MHX
    		73.061
    73.592
    		TSSOP EXP PAD201
    1    		260
    260    		DetailDownloadN/A
    		NSUZXYTT
    LM25116
    MH

    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 LM25116.

    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 LM25116 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM25116MHABCD150XV2036010011554964327875145
    LM25116MHXABCD150XV2036010011554964327875145

    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 LM25116.

    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 LM25116 is located at RoHS Status.

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