LP3879 Micropower 800mA Low Noise Ceramic Stable VReg …

1 MAY2006 REVISEDAPRIL2013LP3879 Micropower800mALowNoise& quot ;CeramicStable& quot ; VoltageRegulatorforLowVoltageApplication sCheckforSamples:LP38791 FEATURESDESCRIPTIONTheLP3879isa800mAfixe d-outputvoltage2 , (50mVIncrements) (VerticallyIntegratedPNP) 1%InitialOutputAccuracyprocess,theLP3879 deliverssuperiorperformance: @800mACapacitorsload,and200 A @100 A load. VeryLowOutputNoiseLowPowerShutdown:TheLP 3879drawslessthan SenseOptionImprovesLoadRegulation10 A quiescentcurrentwhenshutdownpinis pulled :Ensuredoutputvoltageaccuracy <10 A QuiescentCurrentinShutdownis 1%atroomtemperature. LowGroundPinCurrentatallLoadsLowNoise:Br oadbandoutputnoiseisonly18 V HighPeakCurrentCapability(typical)with10 nFbypasscapacitor.

2 Over-Temperature/Over-CurrentProtection -40 C to+125 C JunctionTemperatureRangeAPPLICATIONS ASICP owerSuppliesIn: Desktops,NotebooksandGraphicCards SetTopBoxes,PrintersandCopiers DSPandFPGAP owerSupplies SMPSPost-Regulator MedicalInstrumentation1 Pleasebeawarethatanimportantnoticeconcer ningavailability,standardwarranty,anduse in 2006 2013, +-5273861+ * PF(See AppHints)* PF**S/D+*10 PF+OUTPUT( Ceramic orTantalum recommended)N/C(Ceramicrecommended)N/CLP 3879 SNVS396B MAY2006 * (seeApplicationInformation).**TheShutdow npinmustbeactivelyterminated(seeApplicat ionInformation). TietoINPUT(Pin4)if ,SUBSTRATET heexposeddieattachpadshouldbeconnectedto a 'NonPullBackWSON package, 2006 2013,TexasInstrumentsIncorporatedProduct FolderLinks:LP3879using.

3 Thevalueof J AfortheWSONandSOPowerPadpackagesarespeci ficallydependentonPCBtracearea, MAY2006 REVISEDAPRIL2013 AbsoluteMaximumRatings(1)(2)StorageTempe ratureRange 65 C to+150 COperatingJunctionTemperatureRange-40 C to+125 CLeadTemperature(Soldering,5 seconds)260 CESDR ating(3)2 kVShutdownPin1kVPowerDissipation(4)Inter nallyLimitedInputSupplyVoltage(Survival) +16 VInputSupplyVoltage(TypicalOperating) +6 VSENSEPin +6 VOutputVoltage(Survival)(5) +6 VIOUT(Survival)ShortCircuitProtectedInpu t-OutputVoltage(Survival)(6) +16V(1) (2)If Military/Aerospacespecifieddevicesarereq uired,pleasecontacttheTexasInstrumentsSa lesOffice/Distributorsforavailabilityand specifications.(3)ESDtestingwasperformed usingHumanBodyModel,a 100pFcapacitordischargedthrougha resistor.

4 (4)Themaximumallowablepowerdissipationis a functionofthemaximumjunctiontemperature, TJ(MAX),thejunction-to-ambientthermalres istance, J A, andtheambienttemperature,TA. Themaximumallowablepowerdissipationatany ambienttemperatureis calculatedtracematerial, a fourlayerboardis usedwithmaximumviasfromtheICcentertotheh eatdissipatingcopperlayers,valuesof J Awhichcanbeobtainedareapproximately60 C/WfortheSOPowerPadand40 ,andtheregulatorwillgointothermalshutdow n.(5)If usedin a dual-supplysystemwheretheregulatorloadis returnedtoa negativesupply,theLP3879outputmustbediod e-clampedtoground.(6)TheoutputPNPstructu recontainsa diodebetweentheVINandVOUT terminalsthatis latch-upmodewhichcandamagethepart(seeApp licationHints).

5 Copyright 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks: LP3879 OUTINVV''OUTINVV'' LP3879 SNVS396B MAY2006 standardtypefaceareforTJ= 25 C,andlimitsinboldfacetypeapplyoverthetem peraturerangeof-40 C to125 ,testing, (AOQL).Unlessotherwisespecified:VIN= ,VOUT= 1V,IL= 1 mA,COUT= 10 F,CIN= F,VS/D= 2V,CBYPASS= (1)Typical(2)Max(1) mA IL 800mA , VIN VIN 800mA ,VOUT VOUT(NOM)- 1% 800mA ,VOUT VOUT(NOM)- 1%VIN(min) TJ 125 COutputRegulationIL= 750mA,VOUT VOUT(NOM)- 1% 100 A200 A2752 GroundPinCurrentIL= (PK)PeakOutputCurrentVOUT VOUT(NOM) 5%1200mAIO(MAX)ShortCircuitCurrentRL= 0 (SteadyState)1400enOutputNoiseVoltageBW= 100 Hzto100kHz18 V(RMS)(RMS)CBYPASS= 10nFRippleRejectionf = 1 kHz60dBSHUTDOWNINPUTVS/DVH= OutputOFF,IIN 10 10mV,IIN 50 1S/DInputCurrent AVS/D= 5V515(1)Limitsareensuredthroughtesting,s tatisticalcorrelation,ordesign.

6 (2)Typicalnumbersreperesentthemostlikely normfor25 C 2006 2013,TexasInstrumentsIncorporatedProduct FolderLinks:LP387901020304050100 RIPPLE REJECTION (dB)101001k10k100kFREQUENCY (Hz) TEMPERATURE ( C)VOUT (V)05075100 = (oC)VOUT (V) -40 -20 0 20 40 60 80 100 120 (mA)TEMPERATURE ( C)IL = 800 mAIL = 240 mAIL = 1 MAY2006 REVISEDAPRIL2013 TypicalPerformanceCharacteristicsUnlesso therwisespecified:VIN= ,VOUT= 1V,IL= 1 mA,CIN= F,COUT= 10 F,VS/D= 2V,CBYP= 10nF,TJ= 25 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:LP387901020304050100 RIPPLE REJECTION (dB)101001k10k100kFREQUENCY (Hz)607080901 MIL= 800 mALP3879 SNVS396B MAY2006 (continued)Unlessotherwisespecified:VIN= ,VOUT= 1V,IL= 1 mA,CIN= F,COUT= 10 F,VS/D= 2V,CBYP= 10nF,TJ= 25 2006 2013, (V) MAY2006 REVISEDAPRIL2013 TypicalPerformanceCharacteristics(contin ued)Unlessotherwisespecified:VIN= ,VOUT= 1V,IL= 1 mA,CIN= F,COUT= 10 F,VS/D= 2V,CBYP= 10nF,TJ= 25 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks: LP3879 + + MAY2006.

7 A capacitorwhosevalueis F ( 20%)is goodqualityX5R/ capacitor(seeCapacitorCharacteristicssec tion) & quot ;fromtheinputpinandreturnedtoa ,assumingtheminimuminputcapacitancerequi rementis :TheLP3879requiresa ceramicoutputcapacitorwhosesizeis atleast10 F ( 20%).AgoodqualityX5R/ , (equivalentseriesresistance)valuewhichis curveis providedwhichshowsthestableESRrangeasa functionofloadcurrent(seeFigure19).8 SubmitDocumentationFeedbackCopyright 2006 2013,TexasInstrumentsIncorporatedProduct FolderLinks:LP38790200400600800 LOAD CURRENT (mA) (:) Stable MAY2006 zerowhichisrequiredtoaddphaseleadnearthe loopgaincrossoverfrequency, ,andsomegivea formulaforDissipationFactorwhichcanbeuse dtocalculatea valuefora ,sincetheDFformulais usuallyatamuchlowerfrequencythantherange listedabove,it goodqualityX5 RorX7 Rceramiccapacitorsareused,theactualESRin theseareusedasoutputcapacitorsfortheLP38 79, (SeeCapacitorCharacteristicssection).

8 & quot ;fromtheoutputpinandreturnedtoa ,thecapacitorisconnecteddirectlytoahigh- impedancecircuitin fewmicroamperesflowinginit, ,DCleakagecurrentthroughthenoisebypassca pacitormustneverexceed100nA, :TheLP3879wasdesignedtoworkwithceramicca pacitorsontheoutputtotakeadvantageoftheb enefitstheyoffer:forcapacitancevaluesint he10 F range,ceramicsaretheleastexpensiveandals ohavethelowestESRvalues(whichmakesthembe stforeliminatinghigh-frequencynoise).The ESRofa typical10 Fceramiccapacitorisintherangeof5 m to10m , ( F)aremanufacturedwiththeZ5 UorY5 Vtemperaturecharacteristic,whichresultsi nthecapacitancedroppingbymorethan50%asth etemperaturegoesfrom25 C to85 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks.

9 LP3879LP3879 SNVS396B MAY2006 , shutoffbypullingtheShutdowninputlow,andt urnedonbypullingit thisfeatureis nottobeused, ,thesignalsourceusedtodrivetheShutdownin putmustbeabletoswingaboveandbelowthespec ifiedturn-on/turn- (wheretheinputvoltageis higherthantheoutput)thisdiodeis ,if theoutputispulledabovetheinput, ,a parasiticSCRcanlatchwhichwillallowa highcurrenttoflowintoVIN(andouttheground pin), ,anexternalSchottkydiodemustbeconnectedf romVINtoVOUT(cathodeonVIN, anodeonVOUT), (seeAbsoluteMaximumRatings).10 SubmitDocumentationFeedbackCopyright 2006 2013, MAY2006 REVISEDAPRIL2013 REVISIONHISTORYC hangesfromRevisionA (April2013)toRevisionBPage 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks.

10 LP3879 PACKAGE OPTION 1 PACKAGING INFORMATIONO rderable DeviceStatus(1)Package TypePackageDrawingPinsPackageQtyEco Plan(2)Lead finish/Ball material(6)MSL Peak Temp(3)Op Temp ( C)Device Marking(4/5) PowerPADDDA895 RoHS & GreenSNLevel-3-260C-168 HR-40 to PowerPADDDA895 Non-RoHS& GreenCall TICall PowerPADDDA895 RoHS & GreenSNLevel-3-260C-168 HR-40 to PowerPADDDA82500 RoHS & GreenSNLevel-3-260C-168 HR-40 to PowerPADDDA82500 RoHS & GreenSNLevel-3-260C-168 HR-40 to & GreenSNLevel-1-260C-UNLIM-40 to & GreenSNLevel-1-260C-UNLIM-40 to (1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new : TI has announced that the device will be discontinued, and a lifetime-buy period is in : Not recommended for new designs.