National Semiconductor | High-performance Analog

 

 LM48555   

Ceramic Speaker Driver
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Features
  • Fully differential amplifier
  • Externally configurable gain
  • Soft start function
  • Low power shutdown mode
  • Under voltage lockout
  • Description

    The LM48555 is an audio power amplifier designed to drive ceramic speakers in applications such as cell phones, smart phones, PDAs and other portable devices. The LM48555 produces 15.7VP-P with less than 1% THD+N while operating from a 3.2V power supply. The LM48555 features a low power shutdown mode, and differential inputs for improved noise rejection.

    The LM48555 includes advanced click and pop suppression that eliminates audible turn-on and turn-off transients. Additionally, the integrated boost regulator features a soft start function that minimizes transient current during power-up

    Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. The LM48555 does not require bootstrap capacitors, or snubber circuits.

    The LM48555 is unity-gain stable and uses external gain-setting resistors.

    Key Specification
    IDDQ (Boost Converter + Amplifier)   at VDD = 5V 7.5mA (typ)
    Output Voltage Swing  
      VDD = 3.2V, THD 1% 15.7VP-P (typ)
    Power Supply Rejection Ratio   f = 217Hz 80dB (typ)


    Applications

  • Mobile phones
  • PDA's
  • Digital cameras



  • Typical Application
    *click for larger image


    Block Diagram
    *click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Voltage@ Vcc=5V, 1%THD 15.7 Volt
    Voltage@ Vcc=5V, 10% THD 16.0 Volt
    Load Conditions 1uF+20 ohm
    Supply Min 2.7 Volt
    Supply Max 6.5 Volt
    THD 1 %
    THD Conditions Rl=1uf+20ohm, f=1kHz
    Shutdown Type Low

    Datasheets
    TitleSizeDateOther
    Language
    LM48555 Ceramic Speaker Driver332
    Kbytes
    15-Mar-07   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1611: Application Note 1611 LM48555 Evaluation Board734
    Kbytes
    4-Apr-07 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM48555TL/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    RS COMPONENTSWorldwide14
    $1.95 each at 1K+ pcsreel
    of
    250
    LM48555TLX/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.95 each at 1K+ pcsreel
    of
    3000

    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 LM48555.

    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 LM48555 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM48555TLBD
    LM48555TLBD Evaluation BoardFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    $150.00 each1



    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
    LM48555TL/NOPB

    3.586
    MICRO SMD121260DetailN/AN/A
    XVG
    I I4
    LM48555TLX/NOPB

    3.586
    MICRO SMD121260DetailN/AN/A
    XVG
    I I4

    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 LM48555.

    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 LM48555 is located at RoHS Status.

    CAD Symbols and Models
    N/A
     Models
    N/A


    [Information as of 9-Feb-2012]