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. 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).

2 **TheShutdownpinmustbeactivelyterminated (seeApplicationInformation). TietoINPUT(Pin4)if ,SUBSTRATET heexposeddieattachpadshouldbeconnectedto a 'NonPullBackWSON package, 2006 2013,TexasInstrumentsIncorporatedProduct FolderLinks:LP3879using: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 (3)ESDtestingwasperformedusingHumanBodyM odel,a 100pFcapacitordischargedthrougha resistor.(4)Themaximumallowablepowerdiss ipationis 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).

4 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.

5 (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 , :A capacitorwhosevalueis F ( 20%)is goodqualityX5R/ capacitor(seeCapacitorCharacteristicssec tion) & quot ;fromtheinputpinandreturnedtoa ,assumingtheminimuminputcapacitancerequi rementis :TheLP3879requiresa ceramicoutputcapacitorwhosesizeis atleast10 F ( 20%).

6 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). & quot ;fromtheoutputpinandreturnedtoa ,thecapacitorisconnecteddirectlytoahigh- impedancecircuitin fewmicroamperesflowinginit, ,DCleakagecurrentthroughthenoisebypassca pacitormustneverexceed100nA, :TheLP3879wasdesignedtoworkwithceramicca pacitorsontheoutputtotakeadvantageoftheb enefitstheyoffer:forcapacitancevaluesint he10 F range,ceramicsaretheleastexpensiveandals ohavethelowestESRvalues(whichmakesthembe stforeliminatinghigh-frequencynoise).

7 TheESRofa typical10 Fceramiccapacitorisintherangeof5 m to10m , ( F)aremanufacturedwiththeZ5 UorY5 Vtemperaturecharacteristic,whichresultsi nthecapacitancedroppingbymorethan50%asth etemperaturegoesfrom25 C to85 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks: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).

8 10 SubmitDocumentationFeedbackCopyright 2006 2013, MAY2006 REVISEDAPRIL2013 REVISIONHISTORYC hangesfromRevisionA (April2013)toRevisionBPage 2006 2013,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback11 ProductFolderLinks: 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.

9 Device is in production to support existing customers, but TI does not recommend using this part in a new : Device has been announced but is not in production. Samples may or may not be : TI has discontinued the production of the device. (2) RoHS: TI defines & quot ;RoHS& quot ; to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substancedo not exceed by weight in homogeneous materials. Where designed to be soldered at high temperatures, & quot ;RoHS& quot ; products are suitable for use in specified lead-free processes. TI mayreference these types of products as & quot ;Pb-Free& quot ;.RoHS Exempt: TI defines & quot ;RoHS Exempt& quot ; to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS : TI defines & quot ;Green& quot ; to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold.

10 Antimony trioxide basedflame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a & quot ;~& quot ; will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that OPTION 2 (6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.