National Semiconductor | High-performance Analog

 

 LM4924   
2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifier 		Click link to Download

Features

  • 2-cell 1.5V to 3.6V battery operation
  • OCL mode for stereo headphone operation
  • Unity-gain stable
  • “Click and pop” suppression circuitry for shutdown On and Off transients
  • Active low micropower shutdown
  • Thermal shutdown protection circuitry

    • Description

    The LM4924 is a Output Capacitor-Less (OCL) stereo headphone amplifier, which when connected to a 3.0V supply, delivers 40mW per channel to a 16Ω load with less than 1% THD+N.

    With the LM4924 packaged in the MM and SD packages, the customer benefits include low profile and small size. These packages minimizes PCB area and maximizes output power.

    The LM4924 features circuitry that reduces output transients (“clicks” and “pops”) during device turn-on and turn-off, and Mute On and Off. An externally controlled, low-power consumption, active-low shutdown mode is also included in the LM4924. Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount packages.

    Key Specification

    OCL output power

     (RL = 16Ω, VDD = 3.0V, THD+N = 1%)

    40mW (typ)

    Micropower shutdown current

    0.1µA (typ)

    Supply voltage operating range

    1.5V < VDD < 3.6V

    PSRR 100Hz, VDD = 3.0V, AV = 2.5

    66dB (typ)


    Applications

  • Portable two-cell audio products
  • Portable two-cell electronic devices




    • Typical Application
    click for larger image


    		Connection Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Supply Current 1.5 mA
    User Supply 3 Volt
    Power@ 16Ohms, 1% THD 0.04 Watt
    THD 0.1 %
    PSRR 66 dB
    Channels 2 Channels
    Shutdown Type Low (Mute)
    Supply Min 1.4 Volt
    Supply Max 3.6 Volt
    Exposed DAP Yes
    Output Configuration OCL Virtual Ground
    Temperature Min -40 deg C
    Temperature Max 85 deg C
    THD Conditions Po=10mW
    PSRR Conditions Vrpi=200Mvpp,Sine,f=100Hz,OCL
    Supply Range +1.4 - +3.6 V
    Capless Headphone Yes

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM4924MM/NOPB

    LM4924MM

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.05 each at 1K+ pcsreel
    of
    1000
    LM4924MMX

    RoHS Status

    MINI SOIC    		Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.05 each at 1K+ pcsreel
    of
    3500
    LM4924SD/NOPB

    LM4924SD

    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.98 each at 1K+ pcsreel
    of
    1000
    LM4924SDX

    RoHS Status

    LLP    		Full production
    Lead Time: 16 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.98 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 LM4924.

    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 LM4924 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM4924MM/NOPB

    LM4924MM
    		29.841
    30.002
    		MINI SOIC101
    1    		260
    260    		DetailDownloadN/A
    		ZXTT
    GB7
    LM4924MMX
    		30.002
    		MINI SOIC101260DetailDownloadN/A
    		ZXTT
    GB7
    LM4924SD/NOPB

    LM4924SD
    		21.112
    21.182
    		LLP101
    1    		260
    260    		DetailDownloadN/A
    		ZXYTT
    L4924
    LM4924SDX
    		21.182
    		LLP101260DetailDownloadN/A
    		ZXYTT
    L4924

    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 LM4924.

    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 LM4924 is located at RoHS Status.

    CAD Symbols and Models
    Download LM4924 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM4924MMCMOS811372573017745002503519220
    LM4924MMXCMOS811372573017745002503519220
    LM4924SDCMOS811372573017745002503519220
    LM4924SDXCMOS811372573017745002503519220

    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 LM4924.

    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 LM4924 is located at RoHS Status.

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