National Semiconductor | High-performance Analog

 

 LM4992   

420mW Stereo Cell Phone Audio Amplifier
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Features
  • Available in space-saving LLP package
  • Ultra low current shutdown mode
  • BTL output can drive capacitive loads
  • Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions
  • 2.2 - 5.5V operation
  • No output coupling capacitors, snubber networks or bootstrap capacitors required
  • Unity-gain stable
  • External gain configuration capability
  • Description

    The LM4992 is a stereo audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt, per channel, of continuous average power to an 8 BTL load with less than 1% distortion (THD+N) from a 5VDC power supply.

    Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4992 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.

    The LM4992 features independent shutdown control for each channel and a low-power consumption shutdown mode, which is achieved by driving both shutdown pins with logic low. Additionally, the LM4992 features an internal thermal shutdown protection mechanism.

    The LM4992 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions.

    The LM4992 is unity-gain stable and can be configured by external gain-setting resistors.

    Key Specification
    Improved PSRR at 217Hz & 1KHz 64dB (1KHz)
    Stereo Output Power at 5.0V, 1% THD, 81.07W (typ)
    Stereo Output Power at 3.3V, 1% THD, 8420mW (typ)
    Shutdown Current, Vdd = 3.3V0.2µA (typ)


    Applications

  • Mobile Phones
  • PDAs
  • Portable electronic devices



  • Typical Application
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    Connection Diagram
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    Typical Performance
    click for larger image


     

    ParametersValues
    Power@ 8Ohms, 1% THD 1.07 Watt
    THD 0.15 %
    PSRR 55 dB
    Channels 2 Channels
    Supply Range +2.2 - +5.5 V
    THD Conditions Vdd 5V, Po 0.5Wrms, f 1kHz
    PSRR Conditions Vr 200mV, Vdd 5V, terminated with 10ohm
    User Supply 5 Volt
    Shutdown Type Low
    Temperature Min -40 deg C
    Temperature Max 85 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LM4992 420mW Stereo Cell Phone Audio Amplifier576
    Kbytes
    20-Feb-04   

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM4992SD/NOPB

    LM4992SD

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide2028
    MOUSERWorldwide960
    TAYLORAmericas1000
    $0.70 each at 1K+ pcsreel
    of
    1000
    LM4992SDX/NOPB

    LM4992SDX

    RoHS Status


    LLP
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $0.70 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 LM4992.

    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 LM4992 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM4992SDBD
    420mW Stereo Cell Phone Audio AmplifierFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $200.00 each1

    The LM4992 is a stereo audio power amplifier capable of delivering 1 watt, per channel, of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply.

    The LM4992 features independent shutdown control for each channel and a low-power consumption shutdown mode, which is achieved by driving both shutdown pins with logic low. Additionally, the LM4992 features an internal thermal shutdown protection mechanism.

    This LM4992SDBD is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM4992SD. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load.

    Features:

    • Available in space-saving LLP package
    • Ultra low current shutdown mode
    • BTL output can drive capacitive loads
    • Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions
    • 2.2 - 5.5V operation
    • No output coupling capacitors, snubber networks or bootstrap capacitors required
    • Unity-gain stable
    • External gain configuration capability

    Applications:

    • Mobile Phones
    • PDA's
    • Portable electronic devices

    Contents:

    • Fully Assembled LM4992SD Evaluation Board
    • Instructions for where to locate and download the datasheet

       Please note: application information and board layout can be found in datasheet




    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
    LM4992SD/NOPB

    LM4992SD
    27.794
    27.897
    LLP141
    1
    260
    260
    DetailDownloadN/A
    ZXYTTE#
    L4992
    LM4992SDX/NOPB

    LM4992SDX
    27.794
    27.897
    LLP141
    1
    260
    260
    DetailDownloadN/A
    ZXYTTE#
    L4992

    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 LM4992.

    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 LM4992 is located at RoHS Status.

    CAD Symbols and Models
    Download LM4992 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM4992SDCMOS70213010015840003449464325
    LM4992SDXCMOS70213010015840003449464325

    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 LM4992.

    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 LM4992 is located at RoHS Status.

    [Information as of 9-Feb-2012]