National Semiconductor | High-performance Analog

 

 LM3489   
Hysteretic PFET Buck Controller with Enable Pin 		Click link to Download

Features

  • Easy to use control methodology
  • No control loop compensation required
  • Wide 4.5V to 35V input range
  • 1.239V to VIN adjustable output range
  • High efficiency 93%
  • ±1.3% (±2% over temp) internal reference
  • 100% duty cycle operation
  • Maximum operation frequency > 1MHz
  • Current limit protection
  • Dedicated enable pin (on if unconnected)
  • Shutdown mode draws only 7µA supply current
  • MSOP-8
  • LM3489 is AEC-Q100 Grade 1 qualified

    • Description

    The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated Enable Pin provides a shutdown mode drawing only 7µA. Leaving the Enable Pin unconnected defaults to on.

    Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.


    Applications

  • Set-Top Box
  • DSL/Cable Modem
  • PC/IA
  • Auto PC
  • TFT Monitor
  • Battery Powered Portable Applications
  • Distributed Power Systems
  • Always On Power
  • High Power LED Driver
  • Automotive

    • Also Recommended
    LM25574▲Integrated 42V 0.5A Buck Regulator
    LM25575▲Integrated 42V 1.5A Buck Regulator
    LM25576▲Integrated 42V 3A Buck Regulator



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    *click for larger image


    Parameters / ValuesLM3489 LM25574 LM25575 LM25576
    Output Current4000 mA 500 mA 1500 mA 3000 mA
    Input Min Voltage4.5 Volt 6 Volt 6 Volt 6 Volt
    Input Max Voltage35 Volt 42 Volt 42 Volt 42 Volt
    Output Range1.239V min. 1.23V to 37V 1.23V to 37V 1.23V to 37V
    Frequency Min0 kHz 50 kHz 50 kHz 50 kHz
    Frequency Max1400 kHz 1000 kHz 1000 kHz 1000 kHz
    Feedback Voltage1.239 Volt
    Feedback Tolerance2 %
    Adj Switch FrequencyYes Yes Yes Yes
    Adjustable OutputYes Yes Yes Yes
    Synchronous RectificationNo No No No
    On/Off PinYes Yes Yes Yes
    PowerGood / Error FlagNo No No No
    SoftStartNo Yes Yes Yes
    Sync PinNo Yes Yes Yes
    InvertingNo Yes Yes Yes
    FlybackNo No No No
    Lossless Current SenseYes
    RegTypeSwitching Controller Switching Regulator Switching Regulator Switching Regulator
    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
    Channels1 Channels
    Special FeaturesNo compensation required; Current limit; PFET controller; Enable; Power-saving shutdown mode 1.5% feedback voltage accuracy, emulated current mode 1.5% feedback voltage accuracy, emulated current mode 1.5% feedback voltage accuracy, emulated current mode
    TopologyBuck Buck Buck Buck
    PWM ModeHysteretic Current Current Current
    Step-DownYes Yes Yes Yes
    Step-UpNo
    Output Min1.239 Volt 1.23 Volt 1.23 Volt 1.23 Volt
    AEC Q-100 Automotive Grade1 1 1 1
    AutomotiveYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM3489 Hysteretic PFET Buck Controller with Enable Pin356
    Kbytes    		23-Jun-08日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1471: Application Note 1471 LM3489 Demonstration Board695
    Kbytes    		24-May-06 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3489MM/NOPB

    LM3489MM

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide8430
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide69854
    FARNELLEurope and Asia1246
    MOUSERWorldwide773
    NEWARKAmericas820
    RS COMPONENTSWorldwide70
    RSL MICROAsia Pacific5000
    TAYLORAmericas8430
    		$0.62 each at 1K+ pcsreel
    of
    1000
    LM3489MMX/NOPB

    LM3489MMX

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide28000
    DIGI-KEYWorldwide0
    		$0.62 each at 1K+ pcsreel
    of
    3500
    LM3489QMM/NOPB

    Auto Grade 1
    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    DIGI-KEYWorldwide7776
    MOUSERWorldwide550
    TAYLORAmericas1000
    		$0.72 each at 1K+ pcsreel
    of
    1000
    LM3489QMMX/NOPB

    Auto Grade 1
    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.72 each at 1K+ pcsreel
    of
    3500

    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 LM3489.

    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 LM3489 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM3489EVAL/NOPB

    		Hysteretic PFET Buck Controller with Enable PinFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$34.20 each1

    Features:

    • Wide 4.5V to 35V input range
    • 1.239V to VIN adjustable output range
    • High efficiency 93%
    • ±1.3% (± 2% over temp) internal reference
    • 100% duty cycle operation
    • Maximum operation frequency > 1MHz
    • Current limit protection
    • Dedicated enable pin (on if unconnected)
    • Shutdown mode draws on 7uA supply current
    • MSOP-8

    Applications:

    • Set-top Box
    • DSL/Cable Modem
    • PC/IA
    • Auto PC
    • TFT Monitor
    • Battery Powered Portable Applications
    • Distributed Power Systems
    • Always On Power
    • High Power LED Driver

    Contents:

    • A fully assembled LM3489 evaluation board
    • LM3489 datasheet
    • LM3489 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
    LM3489MM/NOPB

    LM3489MM
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SKSB
    LM3489MMX/NOPB

    LM3489MMX
    		29.851
    30.002
    		MINI SOIC81
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    SKSB
    LM3489QMM/NOPB

    		29.851
    30.002
    		MINI SOIC81260DetailDownloadN/A
    		ZXTT
    STEB
    LM3489QMMX/NOPB

    		29.851
    30.002
    		MINI SOIC81260DetailDownloadN/A
    		ZXTT
    STEB

    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 LM3489.

    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 LM3489 is located at RoHS Status.

    CAD Symbols and Models
    Download LM3489 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM3489MMABCD15004268000639400011814314958
    LM3489MMXABCD15004268000639400011814314958
    LM3489QMMABCD15004268000639400011814314958
    LM3489QMMXABCD15004268000639400011814314958

    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 LM3489.

    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 LM3489 is located at RoHS Status.

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