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LM48556www.
ti.
comSNAS452B–JUNE2008–REVISEDMAY2013LM48556BoomerFullyDifferential,Mono,CeramicSpeakerDriverCheckforSamples:LM485561FEATURESDESCRIPTIONTheLM48556isasinglesupply,mono,ceramic23FullyDifferentialAmplifierspeakerdriverwithanintegratedcharge-pump,ExternallyConfigurableGaindesignedforportabledevices,suchascellphones,IntegratedChargePumpwhereboardspaceisatapremium.
TheLM48556chargepumpallowsthedevicetodeliver17.
5VPPLowPowerShutdownMode(typ)fromasingle4.
5Vsupply.
Additionally,theSoftStartFunctionchargepumpfeaturesasoftstartfunctionthatminimizestransientcurrentduringpower-up.
APPLICATIONSTheLM48556featureshighpowersupplyrejectionMobilePhonesratio(PSRR)of80dBat217Hz,allowingthedevicetoPDA'soperateinnoisyenvironmentswithoutadditionalpowersupplyconditioning.
FlexiblepowersupplyDigitalCamerasrequirementsallowoperationfrom2.
7Vto5.
0V.
Additionally,theLM48556featuresadifferentialinputKEYSPECIFICATIONSfunctionandanexternallyconfigurablegain.
AlowOutputVoltageSwingpowershutdownmodereducessupplycurrentconsumptionto0.
1μA.
–VDD=3.
6V,1kHz14.
2VPP(typ)–VDD=4.
5V,1kHz17.
5VPP(typ)Superiorclickandpopsuppressioneliminatesaudibletransientsonpower-up/downandduringshutdown.
PowerSupplyRejectionRatioTheLM48556isavailableinanultra-small12-bump–f=217Hz,VDD=3.
6V80dB(typ)DSBGApackage(2mmx1.
5mm).
IDDatVDD=3.
6V4.
8mA(typ)Wake-UpTime0.
5ms(typ)1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2BoomerisatrademarkofTexasInstruments.
3Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2008–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
ti.
comTYPICALAPPLICATIONFigure1.
TypicalAudioAmplifierApplicationCircuitConnectionDiagramFigure2.
12BumpDSBGA-TopViewSeePackageNumberYZR00121AA2SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013Figure3.
12BumpDSBGA-PackageViewBUMPDESCRIPTIONSBumpNameDescriptionA1OUT-AmplifierInvertingOutputA2SVDDSignalPowerSupply-PositiveA3IN+AmplifierNon-invertingInputB1SVSSSignalPowerSupply-NegativeB2OUT+AmplifierNon-invertingOutputB3IN-AmplifierInvertingInputC1CPVSSChargePumpOutputVoltageC2C1PChargePumpFlyingCapacitorPositiveTerminalActiveLowResetInput.
ConnecttoVDDfornormaloperation.
DriveSDC3SDlowtodisable.
D1C1NChargePumpFlyingCapacitorNegativeTerminalD2PGNDPowerGroundD3PVDDPowerSupplyCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comThesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
AbsoluteMaximumRatings(1)(2)(3)SupplyVoltage(SVDD,PVDD)(1)5.
25VStorageTemperature65°Cto+150°CInputVoltage0.
3VtoVDD+0.
3VPowerDissipation(4)InternallylimitedESDRating(5)2000VESDRating(6)200VJunctionTemperature150°CThermalResistanceθJA(YZR)114°C/WSolderingInformationSeeAN-1112(SNVA009)MicroSMDWaferLevelChipScale(1)"AbsoluteMaximumRatings"indicatelimitsbeyondwhichdamagetothedevicemayoccur,includinginoperabilityanddegradationofdevicereliabilityand/orperformance.
Functionaloperationofthedeviceand/ornon-degradationattheAbsoluteMaximumRatingsorotherconditionsbeyondthoseindicatedintheRecommendedOperatingConditionsisnotimplied.
TheRecommendedOperatingConditionsindicateconditionsatwhichthedeviceisfunctionalandthedeviceshouldnotbeoperatedbeyondsuchconditions.
Allvoltagesaremeasuredwithrespecttothegroundpin,unlessotherwisespecified.
(2)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(3)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTISalesOffice/Distributorsforavailabilityandspecifications.
(4)ThemaximumpowerdissipationmustbederatedatelevatedtemperaturesandisdictatedbyTJMAX,θJA,andtheambienttemperature,TA.
ThemaximumallowablepowerdissipationisPDMAX=(TJMAX-TA)/θJAorthenumbergiveninAbsoluteMaximumRatings,whicheverislower.
(5)Humanbodymodel,applicablestd.
JESD22-A114C.
(6)Machinemodel,applicablestd.
JESD22-A115-A.
OperatingRatingsTemperatureRangeTMIN≤TA≤TMAX40°C≤TA≤+85°CSupplyVoltage(SVDD,PVDD)2.
7V≤_VDD≤5.
0VElectricalCharacteristicsVDD=3.
6V(1)ThefollowingspecificationsapplyforVDD=3.
6V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)IDDQuiescentPowerSupplyCurrentVIN=0V4.
87mA(max)ISDShutdownCurrentVSD=GND(Note8)0.
11A(max)VOSOutputOffsetVoltageCIN=0.
47μF,AV=1V/V(0dB)0.
64mV(max)TWUWake-upTime0.
5msTHD+N=1%(max);f=1kHz14.
2VPPVOUTOutputVoltageSwingTHD+N=1%(max);f=10kHz11.
511VPP(min)VOUT=11VPP,f=1kHzTHD+NTotalHarmonicDistortion+NoiseAV=0dB0.
005%AV=20dB0.
03%A-weightedfilter,VIN=0VεOSOutputNoise8μVInputreferredPSRRPowerSupplyRejectionRatioVRIPPLE=200mVPP,f=217Hz8060dB(min)(1)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(2)TypicalvaluesrepresentmostlikelyparametricnormsatTA=+25C,andattheRecommendedOperationConditionsatthetimeofproductcharacterizationandarenotensured.
(3)Datasheetmin/maxspecificationlimitsarespecifiedbytestorstatisticalanalysis.
4SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013ElectricalCharacteristicsVDD=3.
6V(1)(continued)ThefollowingspecificationsapplyforVDD=3.
6V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)CMRRCommonModeRejectionRatioInputReferred7060dB(min)VLHLogicHighThresholdVoltage1.
2V(min)VLLLogicLowThresholdVoltage0.
45V(max)ElectricalCharacteristicsVDD=4.
5V(1)ThefollowingspecificationsapplyforVDD=4.
5V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)IDDQuiescentPowerSupplyCurrentVIN=0V6.
510mA(max)ISDShutdownCurrentVSD=GND(Note8)0.
11A(max)VOSOutputOffsetVoltageCIN=0.
47μF,AV=1V/V(0dB)0.
64mV(max)TWUWake-upTime0.
5ms(max)THD+N=1%(max);f=1kHz17.
5VPPVOUTOutputVoltageSwingTHD+N=1%(max);f=10kHz14.
614VPP(min)VOUT=14VPP,f=1kHzTHD+NTotalHarmonicDistortion+NoiseAV=0dB0.
005%AV=20dB0.
03%A-weightedfilter,VIN=0VεOSOutputNoise8μVInputreferredPSRRPowerSupplyRejectionRatioVRIPPLE=200mVPP,f=217Hz,8060dB(min)CMRRCommonModeRejectionRatioInputReferred7060dB(min)VLHLogicHighThresholdVoltage1.
2V(min)VLLLogicLowThresholdVoltage0.
45V(max)(1)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(2)TypicalvaluesrepresentmostlikelyparametricnormsatTA=+25C,andattheRecommendedOperationConditionsatthetimeofproductcharacterizationandarenotensured.
(3)Datasheetmin/maxspecificationlimitsarespecifiedbytestorstatisticalanalysis.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comTypicalPerformanceCharacteristics(ZL=15+1μF,AV=20dB,BW=22kHz)THD+NvsFrequencyTHD+NvsFrequencyVDD=2.
7V,VO=8VPPVDD=3.
6V,VO=14.
2VPPFigure4.
Figure5.
THD+NvsFrequencyTHD+NvsOutputVoltageSwingVDD=4.
5V,VO=17.
5VPPVDD=2.
7V,f=1kHzFigure6.
Figure7.
THD+NvsOutputVoltageSwingTHD+NvsOutputVoltageSwingVDD=3.
6V,f=1kHzVDD=4.
5V,f=1kHzFigure8.
Figure9.
6SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013TypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)CMRRvsFrequencyCMRRvsFrequencyVDD=2.
7V,InputreferredVDD=3.
6V,InputreferredFigure10.
Figure11.
CMRRvsFrequencyPSRRvsFrequencyVDD=4.
5V,InputreferredVDD=2.
7V,InputreferredFigure12.
Figure13.
PSRRvsFrequencyPSRRvsFrequencyVDD=3.
6V,InputreferredVDD=4.
5V,InputreferredFigure14.
Figure15.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comTypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)OutputVoltagevsFrequencyOutputVoltagevsFrequencyVDD=2.
7V,THD+N=1%VDD=3.
6V,THD+N=1%Figure16.
Figure17.
OutputVoltagevsFrequencySupplyCurrentvsSupplyVoltageVDD=4.
5V,THD+N=1%VIN=GND,NoLoadFigure18.
Figure19.
PowerConsumptionvsOutputVoltageSwingPowerConsumptionvsOutputVoltageSwingVDD=2.
7V,THD+N≤1%VDD=3.
6V,THD+N≤1%Figure20.
Figure21.
8SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013TypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)PowerConsumptionvsOutputVoltageSwingVDD=4.
5V,THD+N≤1%Figure22.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comAPPLICATIONINFORMATIONGENERALAMPLIFIERFUNCTIONTheLM48556isafullydifferentialceramicspeakerdriverthatutilizesTI'sinvertingchargepumptechnologytodeliverthehighdrivevoltagesrequiredbyceramicspeakers,withouttheneedfornoisy,board-spaceconsuminginductivebasedregulators.
Thelow-noise,invertingchargepumpcreatesanegativesupply(CPVSS)fromthepositivesupply(PVDD).
Becausetheamplifiersoperatefromthesebipolarsupplies,themaximumoutputvoltageswingforeachamplifierisdoubledcomparedtoatraditionalsinglesupplydevice.
Additionally,theLM48556isconfiguredasabridge-tiedload(BTL)device,quadruplingthemaximumtheoreticaloutputvoltagerangewhencomparedtoasinglesupply,single-endedoutputamplifier,seeBridgeConfigurationExplainedsection.
ThechargepumpandBTLconfigurationallowtheLM48556todeliverover17VP-Pat1kHztoa1Fceramicspeakerwhileoperatingfromasingle4.
5Vsupply.
DIFFERENTIALAMPLIFIEREXPLANATIONTheLM48556featuresadifferentialinputstage,whichoffersimprovednoiserejectioncomparedtoasingle-endedinputamplifier.
Becauseadifferentialinputamplifieramplifiesthedifferencebetweenthetwoinputsignals,anycomponentcommontobothsignalsiscancelled.
AnadditionalbenefitofthedifferentialinputstructureisthepossibleeliminationoftheDCinputblockingcapacitors.
SincetheDCcomponentiscommontobothinputs,andthuscancelledbytheamplifier,theLM48556canbeusedwithoutinputcouplingcapacitorswhenconfiguredwithadifferentialinputsignal.
BRIDGECONFIGURATIONEXPLAINEDTheLM48556isdesignedtodrivealoaddifferentially,aconfigurationcommonlyreferredtoasabridge-tiedload(BTL).
TheBTLconfigurationdiffersfromthesingle-endedconfiguration,whereonesideoftheloadisconnectedtoground.
ABTLamplifieroffersadvantagesoverasingle-endeddevice.
Drivingtheloaddifferentiallydoublestheoutputvoltagecomparedtoasingle-endedamplifierundersimilarconditions.
Anycomponentcommontobothoutputsiscancelled,thusthereisnonetDCvoltageacrosstheload,eliminatingtheDCblockingcapacitorsrequiredbysingle-ended,single-supplyamplifiers.
SHUTDOWNFUNCTIONTheLM48556featuresalowcurrentshutdownmode.
SetSD=GNDtodisabletheamplifierandreducesupplycurrentto0.
1A.
SwitchSDbetweenVDDandGNDforminimumcurrentconsumptioninshutdown.
TheLM48556maybedisabledwithshutdownvoltageslessthan0.
45V,however,theidlecurrentwillbegreaterthanthetypical0.
1Avalue.
PROPERSELECTIONOFEXTERNALCOMPONENTSPowerSupplyBypassing/FilteringProperpowersupplybypassingiscriticalforlownoiseperformanceandhighPSRR.
Placethesupplybypasscapacitorsasclosetothedeviceaspossible.
Placea4.
7Ftantalumcapacitorinparallelwitha0.
1FceramiccapacitorfromVDDtoGND.
Additionalbulkcapacitancemaybeaddedasrequired.
ChargePumpCapacitorSelectionUselowESRceramiccapacitors(lessthan100m)foroptimumperformance.
ChargePumpFlyingCapacitor(C1)Theflyingcapacitor(C1)affectstheloadregulationandoutputimpedanceofthechargepump.
AC1valuethatistoolowresultsinalossofcurrentdrive,leadingtoalossofamplifierheadroom.
AhighervaluedC1improvesloadregulationandlowerschargepumpoutputimpedancetoanextent.
Above4.
7F,theRDS(ON)ofthechargepumpswitchesandtheESRofC1andCSSdominatetheoutputimpedance.
Alowervaluecapacitorcanbeusedinsystemswithlowmaximumoutputpowerrequirements.
10SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013ChargePumpHoldCapacitor(CSS)ThevalueandESRoftheholdcapacitor(CSS)directlyaffectstherippleonCPVSS.
IncreasingthevalueofCSSreducesoutputripple.
DecreasingtheESRofCSSreducesbothoutputrippleandchargepumpoutputimpedance.
Alowervaluecapacitorcanbeusedinsystemswithlowmaximumoutputpowerrequirements.
GainSettingResistorSelectionTheamplifiergainoftheLM48556issetbyfourexternalresistors,twopereachinput,RIN_andRF_Figure1.
TheamplifiergainisgivenbyEquation1:AV=RF/RIN(V/V)(1)Carefulmatchingoftheresistorpairs,RF+andRF-,andRIN+andRIN-,isrequiredforoptimumperformance.
AnymismatchbetweentheresistorsresultsinadifferentialgainerrorthatleadstoanincreaseinTHD+N,decreaseinPSRRandCMRR,aswellasanincreaseinoutputoffsetvoltage.
Resistorswithatoleranceof1%orbetterarerecommended.
Thegainsettingresistorsshouldbeplacedasclosetothedeviceaspossible.
Keepingtheinputtracesclosetogetherandofthesamelengthincreasesnoiserejectioninnoisyenvironments.
Noisecoupledontotheinputtraceswhicharephysicallyclosetoeachotherwillbecommonmodeandeasilyrejected.
FeedbackCapacitorSelectionDuetotheircapacitivenature,ceramicspeakerspoorlyreproducehighfrequencyaudiocontent.
Athighfrequencies,aceramicspeakerpresentsalowimpedanceloadtotheamplifier,increasingtherequireddrivecurrent.
Thehigheroutputcurrentcandrivethedeviceintoclipping,increasingTHD+N.
Low-passfilteringtheaudiosignalimprovesaudioqualitybydecreasingthesignalamplitudeathighfrequencies,reducingthespeakerdrivecurrent.
Addingacapacitorinparallelwitheachfeedbackresistorcreatesasimplelow-passfilterwiththe-3dBpointdeterminedbyEquation2:f3dB=1/2πRFCF(Hz)WhereRFisthevalueofthefeedbackresistordeterminedbyEquation1intheGainSettingResistorSelectionsectionCFisthevalueofthefeedbackcapacitor(2)Thefeedbackcapacitorisoptionalandnotrequiredfornormaloperation.
InputCapacitorSelectionInputcapacitorsblocktheDCcomponentoftheaudiosignal,eliminatinganyconflictbetweentheDCcomponentoftheaudiosourceandthebiasvoltageoftheLM48556.
Theinputcapacitorscreateahigh-passfilterwiththeinputresistorsRIN.
The-3dBpointofthehighpassfilterisfoundusingEquation3below.
f=1/2πRINCIN(Hz)WherethevalueofRINisdeterminedbyEquation1intheGainSettingResistorSelectionsection(3)WhentheLM48556isusingasingle-endedsource,powersupplynoiseonthegroundisseenasaninputsignal.
Settingthehigh-passfilterpointabovethepowersupplynoisefrequencies,217HzinaGSMphone,forexample,filtersoutthenoisesuchthatitisnotamplifiedandheardontheoutput.
Capacitorswithatoleranceof1%orbetterarerecommendedforimpedancematchingandimprovedCMRRandPSRR.
SINGLE-ENDEDAUDIOAMPLIFIERCONFIGURATIONTheLM48556iscompatiblewithsingle-endedsources.
Figure4showsthetypicalsingle-endedapplicationscircuit.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure23.
Single-EndedInputConfigurationBillOfMaterialsComponentDescriptionDesignatorFootprintQuantityLM48556TLLM48556TLLM48556TLLM48556TL14.
7μF,ceramic,lowESR(<0.
1)16V,CapacitorC1CR3216-12061-40°Cto+85°CCapacitor82μF,16V,-40°Cto+85°CCF+CR2012-08051Capacitor82μF,16V,-40°Cto+85°CCF-CR2012-08051Capacitor0.
47μF,16V,-40°Cto+85°CIN+CR2012-08051Capacitor0.
47μF,16V,-40°Cto+85°CCIN-CR2012-08051Capacitor4.
7μF,16V,-40°Cto+85°CCS1CR3216-12061Capacitor0.
1μFceramic,16V,-40°Cto+85°CCS2CR2012-0805110μFceramic,lowESR(<0.
1)16V,CapacitorCSSCR3216-12061-40°Cto+85°CHeader,2–PinHeader2INHDR1X21Resistor200kRF+CR2012-08051Resistor200kRF+CR2012-08051Resistor200kRIN+CR2012-08051Resistor200kRIN-CR2012-08051Header,2–PinHeader2SPEAKERHDR1X21Header,2–PinHeader2VDDHDR1X21Header,3–Pin3–polejumperJ13–polejumper112SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013DemonstrationBoardSchematicDemonstrationBoardPCBViewsFigure24.
TopOverlayCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure25.
TopLayerFigure26.
MidLayer114SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013Figure27.
MidLayer2Figure28.
BottomOverlayCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure29.
BottomLayer16SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013REVISIONHISTORYRevDateDescription1.
006/03/08Initialrelease.
1.
0112/09/08ChangedPowerSupplyVoltageLimitsfrom4.
5Vto5.
0V.
B05/02/2013ChangedlayoutofNationalDataSheettoTIformatCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback17ProductFolderLinks:LM48556PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLM48556TL/NOPBACTIVEDSBGAYZR12250RoHS&GreenSNAGCULevel-1-260C-UNLIMGK4LM48556TLX/NOPBACTIVEDSBGAYZR123000RoHS&GreenSNAGCULevel-1-260C-UNLIMGK4(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page2TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLM48556TL/NOPBDSBGAYZR12250178.
08.
41.
682.
130.
764.
08.
0Q1LM48556TLX/NOPBDSBGAYZR123000178.
08.
41.
682.
130.
764.
08.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com8-May-2013PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)LM48556TL/NOPBDSBGAYZR12250210.
0185.
035.
0LM48556TLX/NOPBDSBGAYZR123000210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com8-May-2013PackMaterials-Page2MECHANICALDATAYZR0012xxxwww.
ti.
comTLA12XXX(RevC)0.
600±0.
075DEA.
Alllineardimensionsareinmillimeters.
DimensioningandtolerancingperASMEY14.
5M-1994.
B.
Thisdrawingissubjecttochangewithoutnotice.
4215049/A12/12NOTES:D:Max=E:Max=2.
012mm,Min=1.
512mm,Min=1.
951mm1.
452mmIMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
TI'sproductsareprovidedsubjecttoTI'sTermsofSale(www.
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html)orotherapplicabletermsavailableeitheronti.
comorprovidedinconjunctionwithsuchTIproducts.
TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
ti.
comSNAS452B–JUNE2008–REVISEDMAY2013LM48556BoomerFullyDifferential,Mono,CeramicSpeakerDriverCheckforSamples:LM485561FEATURESDESCRIPTIONTheLM48556isasinglesupply,mono,ceramic23FullyDifferentialAmplifierspeakerdriverwithanintegratedcharge-pump,ExternallyConfigurableGaindesignedforportabledevices,suchascellphones,IntegratedChargePumpwhereboardspaceisatapremium.
TheLM48556chargepumpallowsthedevicetodeliver17.
5VPPLowPowerShutdownMode(typ)fromasingle4.
5Vsupply.
Additionally,theSoftStartFunctionchargepumpfeaturesasoftstartfunctionthatminimizestransientcurrentduringpower-up.
APPLICATIONSTheLM48556featureshighpowersupplyrejectionMobilePhonesratio(PSRR)of80dBat217Hz,allowingthedevicetoPDA'soperateinnoisyenvironmentswithoutadditionalpowersupplyconditioning.
FlexiblepowersupplyDigitalCamerasrequirementsallowoperationfrom2.
7Vto5.
0V.
Additionally,theLM48556featuresadifferentialinputKEYSPECIFICATIONSfunctionandanexternallyconfigurablegain.
AlowOutputVoltageSwingpowershutdownmodereducessupplycurrentconsumptionto0.
1μA.
–VDD=3.
6V,1kHz14.
2VPP(typ)–VDD=4.
5V,1kHz17.
5VPP(typ)Superiorclickandpopsuppressioneliminatesaudibletransientsonpower-up/downandduringshutdown.
PowerSupplyRejectionRatioTheLM48556isavailableinanultra-small12-bump–f=217Hz,VDD=3.
6V80dB(typ)DSBGApackage(2mmx1.
5mm).
IDDatVDD=3.
6V4.
8mA(typ)Wake-UpTime0.
5ms(typ)1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2BoomerisatrademarkofTexasInstruments.
3Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2008–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
ti.
comTYPICALAPPLICATIONFigure1.
TypicalAudioAmplifierApplicationCircuitConnectionDiagramFigure2.
12BumpDSBGA-TopViewSeePackageNumberYZR00121AA2SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013Figure3.
12BumpDSBGA-PackageViewBUMPDESCRIPTIONSBumpNameDescriptionA1OUT-AmplifierInvertingOutputA2SVDDSignalPowerSupply-PositiveA3IN+AmplifierNon-invertingInputB1SVSSSignalPowerSupply-NegativeB2OUT+AmplifierNon-invertingOutputB3IN-AmplifierInvertingInputC1CPVSSChargePumpOutputVoltageC2C1PChargePumpFlyingCapacitorPositiveTerminalActiveLowResetInput.
ConnecttoVDDfornormaloperation.
DriveSDC3SDlowtodisable.
D1C1NChargePumpFlyingCapacitorNegativeTerminalD2PGNDPowerGroundD3PVDDPowerSupplyCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
ti.
comThesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
AbsoluteMaximumRatings(1)(2)(3)SupplyVoltage(SVDD,PVDD)(1)5.
25VStorageTemperature65°Cto+150°CInputVoltage0.
3VtoVDD+0.
3VPowerDissipation(4)InternallylimitedESDRating(5)2000VESDRating(6)200VJunctionTemperature150°CThermalResistanceθJA(YZR)114°C/WSolderingInformationSeeAN-1112(SNVA009)MicroSMDWaferLevelChipScale(1)"AbsoluteMaximumRatings"indicatelimitsbeyondwhichdamagetothedevicemayoccur,includinginoperabilityanddegradationofdevicereliabilityand/orperformance.
Functionaloperationofthedeviceand/ornon-degradationattheAbsoluteMaximumRatingsorotherconditionsbeyondthoseindicatedintheRecommendedOperatingConditionsisnotimplied.
TheRecommendedOperatingConditionsindicateconditionsatwhichthedeviceisfunctionalandthedeviceshouldnotbeoperatedbeyondsuchconditions.
Allvoltagesaremeasuredwithrespecttothegroundpin,unlessotherwisespecified.
(2)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(3)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTISalesOffice/Distributorsforavailabilityandspecifications.
(4)ThemaximumpowerdissipationmustbederatedatelevatedtemperaturesandisdictatedbyTJMAX,θJA,andtheambienttemperature,TA.
ThemaximumallowablepowerdissipationisPDMAX=(TJMAX-TA)/θJAorthenumbergiveninAbsoluteMaximumRatings,whicheverislower.
(5)Humanbodymodel,applicablestd.
JESD22-A114C.
(6)Machinemodel,applicablestd.
JESD22-A115-A.
OperatingRatingsTemperatureRangeTMIN≤TA≤TMAX40°C≤TA≤+85°CSupplyVoltage(SVDD,PVDD)2.
7V≤_VDD≤5.
0VElectricalCharacteristicsVDD=3.
6V(1)ThefollowingspecificationsapplyforVDD=3.
6V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)IDDQuiescentPowerSupplyCurrentVIN=0V4.
87mA(max)ISDShutdownCurrentVSD=GND(Note8)0.
11A(max)VOSOutputOffsetVoltageCIN=0.
47μF,AV=1V/V(0dB)0.
64mV(max)TWUWake-upTime0.
5msTHD+N=1%(max);f=1kHz14.
2VPPVOUTOutputVoltageSwingTHD+N=1%(max);f=10kHz11.
511VPP(min)VOUT=11VPP,f=1kHzTHD+NTotalHarmonicDistortion+NoiseAV=0dB0.
005%AV=20dB0.
03%A-weightedfilter,VIN=0VεOSOutputNoise8μVInputreferredPSRRPowerSupplyRejectionRatioVRIPPLE=200mVPP,f=217Hz8060dB(min)(1)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(2)TypicalvaluesrepresentmostlikelyparametricnormsatTA=+25C,andattheRecommendedOperationConditionsatthetimeofproductcharacterizationandarenotensured.
(3)Datasheetmin/maxspecificationlimitsarespecifiedbytestorstatisticalanalysis.
4SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013ElectricalCharacteristicsVDD=3.
6V(1)(continued)ThefollowingspecificationsapplyforVDD=3.
6V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)CMRRCommonModeRejectionRatioInputReferred7060dB(min)VLHLogicHighThresholdVoltage1.
2V(min)VLLLogicLowThresholdVoltage0.
45V(max)ElectricalCharacteristicsVDD=4.
5V(1)ThefollowingspecificationsapplyforVDD=4.
5V,AV-BTL=20dB(RF=200k,RIN=20k),ZL=15+1μF,unlessotherwisespecified.
LimitsapplyforTA=25°C.
LM48556UnitsSymbolParameterConditions(Limits)Typical(2)Limit(3)IDDQuiescentPowerSupplyCurrentVIN=0V6.
510mA(max)ISDShutdownCurrentVSD=GND(Note8)0.
11A(max)VOSOutputOffsetVoltageCIN=0.
47μF,AV=1V/V(0dB)0.
64mV(max)TWUWake-upTime0.
5ms(max)THD+N=1%(max);f=1kHz17.
5VPPVOUTOutputVoltageSwingTHD+N=1%(max);f=10kHz14.
614VPP(min)VOUT=14VPP,f=1kHzTHD+NTotalHarmonicDistortion+NoiseAV=0dB0.
005%AV=20dB0.
03%A-weightedfilter,VIN=0VεOSOutputNoise8μVInputreferredPSRRPowerSupplyRejectionRatioVRIPPLE=200mVPP,f=217Hz,8060dB(min)CMRRCommonModeRejectionRatioInputReferred7060dB(min)VLHLogicHighThresholdVoltage1.
2V(min)VLLLogicLowThresholdVoltage0.
45V(max)(1)TheElectricalCharacteristicstableslistensuredspecificationsunderthelistedRecommendedOperatingConditionsexceptasotherwisemodifiedorspecifiedbytheElectricalCharacteristicsConditionsand/orNotes.
Typicalspecificationsareestimationsonlyandarenotensured.
(2)TypicalvaluesrepresentmostlikelyparametricnormsatTA=+25C,andattheRecommendedOperationConditionsatthetimeofproductcharacterizationandarenotensured.
(3)Datasheetmin/maxspecificationlimitsarespecifiedbytestorstatisticalanalysis.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comTypicalPerformanceCharacteristics(ZL=15+1μF,AV=20dB,BW=22kHz)THD+NvsFrequencyTHD+NvsFrequencyVDD=2.
7V,VO=8VPPVDD=3.
6V,VO=14.
2VPPFigure4.
Figure5.
THD+NvsFrequencyTHD+NvsOutputVoltageSwingVDD=4.
5V,VO=17.
5VPPVDD=2.
7V,f=1kHzFigure6.
Figure7.
THD+NvsOutputVoltageSwingTHD+NvsOutputVoltageSwingVDD=3.
6V,f=1kHzVDD=4.
5V,f=1kHzFigure8.
Figure9.
6SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013TypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)CMRRvsFrequencyCMRRvsFrequencyVDD=2.
7V,InputreferredVDD=3.
6V,InputreferredFigure10.
Figure11.
CMRRvsFrequencyPSRRvsFrequencyVDD=4.
5V,InputreferredVDD=2.
7V,InputreferredFigure12.
Figure13.
PSRRvsFrequencyPSRRvsFrequencyVDD=3.
6V,InputreferredVDD=4.
5V,InputreferredFigure14.
Figure15.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comTypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)OutputVoltagevsFrequencyOutputVoltagevsFrequencyVDD=2.
7V,THD+N=1%VDD=3.
6V,THD+N=1%Figure16.
Figure17.
OutputVoltagevsFrequencySupplyCurrentvsSupplyVoltageVDD=4.
5V,THD+N=1%VIN=GND,NoLoadFigure18.
Figure19.
PowerConsumptionvsOutputVoltageSwingPowerConsumptionvsOutputVoltageSwingVDD=2.
7V,THD+N≤1%VDD=3.
6V,THD+N≤1%Figure20.
Figure21.
8SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013TypicalPerformanceCharacteristics(continued)(ZL=15+1μF,AV=20dB,BW=22kHz)PowerConsumptionvsOutputVoltageSwingVDD=4.
5V,THD+N≤1%Figure22.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
ti.
comAPPLICATIONINFORMATIONGENERALAMPLIFIERFUNCTIONTheLM48556isafullydifferentialceramicspeakerdriverthatutilizesTI'sinvertingchargepumptechnologytodeliverthehighdrivevoltagesrequiredbyceramicspeakers,withouttheneedfornoisy,board-spaceconsuminginductivebasedregulators.
Thelow-noise,invertingchargepumpcreatesanegativesupply(CPVSS)fromthepositivesupply(PVDD).
Becausetheamplifiersoperatefromthesebipolarsupplies,themaximumoutputvoltageswingforeachamplifierisdoubledcomparedtoatraditionalsinglesupplydevice.
Additionally,theLM48556isconfiguredasabridge-tiedload(BTL)device,quadruplingthemaximumtheoreticaloutputvoltagerangewhencomparedtoasinglesupply,single-endedoutputamplifier,seeBridgeConfigurationExplainedsection.
ThechargepumpandBTLconfigurationallowtheLM48556todeliverover17VP-Pat1kHztoa1Fceramicspeakerwhileoperatingfromasingle4.
5Vsupply.
DIFFERENTIALAMPLIFIEREXPLANATIONTheLM48556featuresadifferentialinputstage,whichoffersimprovednoiserejectioncomparedtoasingle-endedinputamplifier.
Becauseadifferentialinputamplifieramplifiesthedifferencebetweenthetwoinputsignals,anycomponentcommontobothsignalsiscancelled.
AnadditionalbenefitofthedifferentialinputstructureisthepossibleeliminationoftheDCinputblockingcapacitors.
SincetheDCcomponentiscommontobothinputs,andthuscancelledbytheamplifier,theLM48556canbeusedwithoutinputcouplingcapacitorswhenconfiguredwithadifferentialinputsignal.
BRIDGECONFIGURATIONEXPLAINEDTheLM48556isdesignedtodrivealoaddifferentially,aconfigurationcommonlyreferredtoasabridge-tiedload(BTL).
TheBTLconfigurationdiffersfromthesingle-endedconfiguration,whereonesideoftheloadisconnectedtoground.
ABTLamplifieroffersadvantagesoverasingle-endeddevice.
Drivingtheloaddifferentiallydoublestheoutputvoltagecomparedtoasingle-endedamplifierundersimilarconditions.
Anycomponentcommontobothoutputsiscancelled,thusthereisnonetDCvoltageacrosstheload,eliminatingtheDCblockingcapacitorsrequiredbysingle-ended,single-supplyamplifiers.
SHUTDOWNFUNCTIONTheLM48556featuresalowcurrentshutdownmode.
SetSD=GNDtodisabletheamplifierandreducesupplycurrentto0.
1A.
SwitchSDbetweenVDDandGNDforminimumcurrentconsumptioninshutdown.
TheLM48556maybedisabledwithshutdownvoltageslessthan0.
45V,however,theidlecurrentwillbegreaterthanthetypical0.
1Avalue.
PROPERSELECTIONOFEXTERNALCOMPONENTSPowerSupplyBypassing/FilteringProperpowersupplybypassingiscriticalforlownoiseperformanceandhighPSRR.
Placethesupplybypasscapacitorsasclosetothedeviceaspossible.
Placea4.
7Ftantalumcapacitorinparallelwitha0.
1FceramiccapacitorfromVDDtoGND.
Additionalbulkcapacitancemaybeaddedasrequired.
ChargePumpCapacitorSelectionUselowESRceramiccapacitors(lessthan100m)foroptimumperformance.
ChargePumpFlyingCapacitor(C1)Theflyingcapacitor(C1)affectstheloadregulationandoutputimpedanceofthechargepump.
AC1valuethatistoolowresultsinalossofcurrentdrive,leadingtoalossofamplifierheadroom.
AhighervaluedC1improvesloadregulationandlowerschargepumpoutputimpedancetoanextent.
Above4.
7F,theRDS(ON)ofthechargepumpswitchesandtheESRofC1andCSSdominatetheoutputimpedance.
Alowervaluecapacitorcanbeusedinsystemswithlowmaximumoutputpowerrequirements.
10SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013ChargePumpHoldCapacitor(CSS)ThevalueandESRoftheholdcapacitor(CSS)directlyaffectstherippleonCPVSS.
IncreasingthevalueofCSSreducesoutputripple.
DecreasingtheESRofCSSreducesbothoutputrippleandchargepumpoutputimpedance.
Alowervaluecapacitorcanbeusedinsystemswithlowmaximumoutputpowerrequirements.
GainSettingResistorSelectionTheamplifiergainoftheLM48556issetbyfourexternalresistors,twopereachinput,RIN_andRF_Figure1.
TheamplifiergainisgivenbyEquation1:AV=RF/RIN(V/V)(1)Carefulmatchingoftheresistorpairs,RF+andRF-,andRIN+andRIN-,isrequiredforoptimumperformance.
AnymismatchbetweentheresistorsresultsinadifferentialgainerrorthatleadstoanincreaseinTHD+N,decreaseinPSRRandCMRR,aswellasanincreaseinoutputoffsetvoltage.
Resistorswithatoleranceof1%orbetterarerecommended.
Thegainsettingresistorsshouldbeplacedasclosetothedeviceaspossible.
Keepingtheinputtracesclosetogetherandofthesamelengthincreasesnoiserejectioninnoisyenvironments.
Noisecoupledontotheinputtraceswhicharephysicallyclosetoeachotherwillbecommonmodeandeasilyrejected.
FeedbackCapacitorSelectionDuetotheircapacitivenature,ceramicspeakerspoorlyreproducehighfrequencyaudiocontent.
Athighfrequencies,aceramicspeakerpresentsalowimpedanceloadtotheamplifier,increasingtherequireddrivecurrent.
Thehigheroutputcurrentcandrivethedeviceintoclipping,increasingTHD+N.
Low-passfilteringtheaudiosignalimprovesaudioqualitybydecreasingthesignalamplitudeathighfrequencies,reducingthespeakerdrivecurrent.
Addingacapacitorinparallelwitheachfeedbackresistorcreatesasimplelow-passfilterwiththe-3dBpointdeterminedbyEquation2:f3dB=1/2πRFCF(Hz)WhereRFisthevalueofthefeedbackresistordeterminedbyEquation1intheGainSettingResistorSelectionsectionCFisthevalueofthefeedbackcapacitor(2)Thefeedbackcapacitorisoptionalandnotrequiredfornormaloperation.
InputCapacitorSelectionInputcapacitorsblocktheDCcomponentoftheaudiosignal,eliminatinganyconflictbetweentheDCcomponentoftheaudiosourceandthebiasvoltageoftheLM48556.
Theinputcapacitorscreateahigh-passfilterwiththeinputresistorsRIN.
The-3dBpointofthehighpassfilterisfoundusingEquation3below.
f=1/2πRINCIN(Hz)WherethevalueofRINisdeterminedbyEquation1intheGainSettingResistorSelectionsection(3)WhentheLM48556isusingasingle-endedsource,powersupplynoiseonthegroundisseenasaninputsignal.
Settingthehigh-passfilterpointabovethepowersupplynoisefrequencies,217HzinaGSMphone,forexample,filtersoutthenoisesuchthatitisnotamplifiedandheardontheoutput.
Capacitorswithatoleranceof1%orbetterarerecommendedforimpedancematchingandimprovedCMRRandPSRR.
SINGLE-ENDEDAUDIOAMPLIFIERCONFIGURATIONTheLM48556iscompatiblewithsingle-endedsources.
Figure4showsthetypicalsingle-endedapplicationscircuit.
Copyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure23.
Single-EndedInputConfigurationBillOfMaterialsComponentDescriptionDesignatorFootprintQuantityLM48556TLLM48556TLLM48556TLLM48556TL14.
7μF,ceramic,lowESR(<0.
1)16V,CapacitorC1CR3216-12061-40°Cto+85°CCapacitor82μF,16V,-40°Cto+85°CCF+CR2012-08051Capacitor82μF,16V,-40°Cto+85°CCF-CR2012-08051Capacitor0.
47μF,16V,-40°Cto+85°CIN+CR2012-08051Capacitor0.
47μF,16V,-40°Cto+85°CCIN-CR2012-08051Capacitor4.
7μF,16V,-40°Cto+85°CCS1CR3216-12061Capacitor0.
1μFceramic,16V,-40°Cto+85°CCS2CR2012-0805110μFceramic,lowESR(<0.
1)16V,CapacitorCSSCR3216-12061-40°Cto+85°CHeader,2–PinHeader2INHDR1X21Resistor200kRF+CR2012-08051Resistor200kRF+CR2012-08051Resistor200kRIN+CR2012-08051Resistor200kRIN-CR2012-08051Header,2–PinHeader2SPEAKERHDR1X21Header,2–PinHeader2VDDHDR1X21Header,3–Pin3–polejumperJ13–polejumper112SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013DemonstrationBoardSchematicDemonstrationBoardPCBViewsFigure24.
TopOverlayCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure25.
TopLayerFigure26.
MidLayer114SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013Figure27.
MidLayer2Figure28.
BottomOverlayCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:LM48556LM48556SNAS452B–JUNE2008–REVISEDMAY2013www.
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comFigure29.
BottomLayer16SubmitDocumentationFeedbackCopyright2008–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM48556LM48556www.
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comSNAS452B–JUNE2008–REVISEDMAY2013REVISIONHISTORYRevDateDescription1.
006/03/08Initialrelease.
1.
0112/09/08ChangedPowerSupplyVoltageLimitsfrom4.
5Vto5.
0V.
B05/02/2013ChangedlayoutofNationalDataSheettoTIformatCopyright2008–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback17ProductFolderLinks:LM48556PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLM48556TL/NOPBACTIVEDSBGAYZR12250RoHS&GreenSNAGCULevel-1-260C-UNLIMGK4LM48556TLX/NOPBACTIVEDSBGAYZR123000RoHS&GreenSNAGCULevel-1-260C-UNLIMGK4(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page2TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLM48556TL/NOPBDSBGAYZR12250178.
08.
41.
682.
130.
764.
08.
0Q1LM48556TLX/NOPBDSBGAYZR123000178.
08.
41.
682.
130.
764.
08.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
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