PT5305-1.4W Filter-free Class D Audio Power AmplifierPDF文檔下載
GENERAL DESCRIPTION





ThePT5305isasinglesupply,highefficiency1.5Wclass Daudioamplifier.Alownoise,filterlessPWMarchitecture eliminatestheoutputfilter,reducesexternalcomponent count,boardareaconsumption,systemcost,andsimplifies design.
ThePT5305isdesignedtomeetthedemandsofmobile phonesandotherportablecommunicationdevices.Operatingonasingle5Vsupply,itiscapableofdrivingan8Ω speakerloadatacontinuousaverageoutputof1.5Wwith lessthan10%THD+N.Itsflexiblepowersupplyrequirements allowoperationfrom2.5Vto5.5V.
ThePT5305hashighefficiencywithspeakerloadscomparedtoatypicalClassABamplifier.Witha5Vsupply drivingan8Ωspeaker,theIC’sefficiencyfora100mW powerlevelis82%,and reaching90%at400mWoutputpower.





FEATURES





¨1.5W Into 8 Ω from a 5V supply at THD=10% (Typ.)
¨High Efficiency: 90% at 400mW, 5V power supply and 8Ω speaker
¨1.7mA Quiescent Current @ V_DD=5V
¨0.1uA Shutdown Current
¨advanced pop & click eliminating circuitry
¨low power shutdown mode
¨Only Three External Components
¨Wide Supply Voltage (2.5V to 5.5V)
¨Space Saving Packages3mm *3mm QFN package and 8-pin MSOP package





APPLICATION





¨Cell Phones
¨Handheld Computers and PDAs
¨Portable electronic devices

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