LM5116 Wide Range Synchronous Buck Controller datasheet ...

1 FBVINVCCRT/ SYNCHBENLLM5116 COMPAGNDCSGRAMPSSCSPGNDLOVOUTHOSWUVLOVCC XDEMBCSYNCCVCCVINCHBCOUTVOUTRFB2 RSCRAMPCSSCHFRTCCOMPRCOMPRUV1 RUV2 VINCINRFB1 ProductFolderOrderNowTechnicalDocumentsT ools &SoftwareSupport &CommunityReferenceDesignAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand FEBRUARY2007 REVISEDJULY2015LM5116 Wide RangeSynchronousBuck Controller11 Features1 EmulatedPeakCurrentMode WideOperatingRangeUp to 100 V Low IQShutdown(< 10 A) DrivesStandardor LogicLevelMOSFETs Free-runor SynchronousOperationto 1 MHz OptionalDiodeEmulationMode to 80 V ProgrammableCurrentLimit ProgrammableSoft-Start ProgrammableLine UndervoltageLockout AutomaticSwitchto ExternalBiasSupply HTSSOP-20 ExposedPad ThermalShutdown Createa CustomDesignUsingthe LM5116withthe WEBENCHP owerDesigner2 Applications AutomotiveInfotainment IndustrialDC-DCMotorDrivers AutomotiveUSBA dapters TelecomServers3 DescriptionTheLM5116is a synchronousbuckcontrollerintendedfor

2 Step-downregulatorapplicationsfromahigh- voltageor baseduponcurrentmodecontrolutilizingan feed-forward,cycle-by-cyclecurrentlimiti ng, use of an emulatedcontrolrampreducesnoisesensitivi tyof thepulse-widthmodulationcircuit,allowing reliablecontrolof verysmalldutycyclesnecessaryin programmablefrom50kHz to 1 user-selectablediodeemulationmodeenables discontinuousmodeoperation,forimprovedef ficiencyat lowquiescentcurrentshutdowndisablesthe controllerand consumesless than10 A of total high-voltagebiasregulator,automaticswitc h-overto externalbiasforimprovedefficiency,therma lshutdown,frequencysynchronization,cycle -by-cyclecurrentlimit,andadjustableline a powerenhancedHTSSOP-20packagefeaturingan exposeddie attachpad to aid (1)PARTNUMBERPACKAGEBODYSIZE(NOM) LM5116 HTSSOP(20) (1) For all availablepackages,see the orderableaddendumatthe end of the FEBRUARY2007.

3 LM5116 SubmitDocumentationFeedbackCopyright 2007 2015,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (March2013)to RevisionHPage AddedESDR atingstable,FeatureDescriptionsection,De viceFunctionalModes,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and (March2013)to RevisionGPage Changedlayoutof NationalDataSheetto TI FEBRUARY2007 REVISEDJULY2015 ProductFolderLinks.

4 LM5116 SubmitDocumentationFeedbackCopyright 2007 2015,TexasInstrumentsIncorporated(1)G = Ground,I = Input,O = Output,P = Power5 Pin Configurationand FunctionsPWPP ackage20-PinHTSSOPTop ViewPin FunctionsPINI/O(1) PGND throughthe exposedpad the loop compensationnetworkshouldbe connectedbetweenthis pin and the FB the top of the currentsenseresistoror the drainofthe low-sidedMOSFETif RDS(ON)currentsensingis the bottomof the senseresistoror the sourceofthe low-sideMOSFETif RDS(ON)currentsensingis start-upinto a pre-biasedload,tie this pin to groundat the fully synchronousoperation,use anexternalseriesresistorbetweenDEMBand groundto raisethe diodeemulationthresholdabovethe low-sideSW the EN pin is V, the regulatoris in a low-powerstate.

5 Drawingless than10 mustbe V for maximumEN transitiontime for properoperationis one pin is connectedto the invertinginputof regulationthresholdis the cathodeof the bootstrapdiodeand the positiveterminalof the bootstrapcapacitorsuppliescurrentto chargethe high-sideMOSFET gateand shouldbe placedas closeto thecontrolleras the gateof the high-sidesynchronousMOSFET througha short,low inductancepathLO15 OConnectto the gateof the low-sidesynchronousMOSFET througha short,low AGND throughthe exposedpad externalcapacitorconnectedbetweenthis pin and the AGND pinsets the rampslopeusedfor internaloscillatoris set with a singleresistorbetweenthis pin and the AGNDpin.

6 Therecommendedfrequencyrangeis 50 kHz to 1 internaloscillatorcan besynchronizedto an externalclockby AC couplinga positiveedgeontothis FEBRUARY2007 : LM5116 SubmitDocumentationFeedbackCopyright 2007 2015,TexasInstrumentsIncorporatedPin Functions(continued)PINI/O(1) externalcapacitorand an internal10- A currentsourceset the soft starttime constantforthe rise of the SS pin is held low duringVCC< V, UVLO< , EN inputlow, or the negativeterminalof the bootstrapcapacitorand the sourceterminalof the ,inputvoltagemonitor,and inputto the the UVLOpin is , the regulatoris in standbymode(VCCregulatorrunning,switchin gregulatordisabled).

7 If the UVLOpin voltageis , the externalvoltagedividercan set an a fixed5- A pullupcurrenton this pin whenEN is pulledto groundwhenacurrentlimit conditionexistsfor 256 PGND usinga low ESR/ESLcapacitorlocatedas closeto the controlleras an VCCX> V, VCCXis internallyconnectedto VCCand the internalVCCregulatoris VCCXis unused,it shouldbeconnectedto the groundplane.(1)Stressesbeyondthoselisted underAbsoluteMaximumRatingsmay causepermanentdamageto the stressratingsonly,whichdo not implyfunctionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditions.

8 Exposureto absolute-maximum-ratedconditionsfor extendedperiodsmay affectdevicereliability.(2)Thesepins mustnot (unlessotherwisenoted)(1)MINMAXUNITVIN to GND ,VCCX,UVLOto GND(2) , CS to GND to SW to SW + GND GND 11 VLO to GND + to GND to GND GND to GND to GND CStorageTemperature 55150 FEBRUARY2007 REVISEDJULY2015 ProductFolderLinks: LM5116 SubmitDocumentationFeedbackCopyright 2007 2015,TexasInstrumentsIncorporated(1)JEDE C documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)The humanbodymodelis a 100-pFcapacitordischargedthrougha resistorinto eachpin.

9 2-kVratingfor all pins exceptVINwhichis ratedfor kV.(3)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (ESD)ElectrostaticdischargeHuman-bodymod el(HBM),per ANSI/ESDA/JEDECJS-001(1)(2) 2000 VCharged-devicemodel(CDM),per JEDEC specificationJESD22-C101(3) 750(1)RAMP,COMPare suchthey are not specifiedto havean externalvoltageapplied.(2)RecommendedOpe ratingRatingsdo not specifiedperformancelimitsand associatedtest conditions, (unlessotherwisenoted)(1)(2)MINMAXUNITVI N6100 VVCC, to GND 40125 C(1)For moreinformationabouttraditionaland new thermalmetrics,see theSemiconductorand IC PackageThermalMetricsapplicationreport, (1) LM5116 UNITPWP(HTSSOP)20 PINSR C/WR JC(top)Junction-to-case(top) C/WR C/W C/W C/WR JC(bot)Junction-to-case(bottom) C/W6LM5116 SNVS499H FEBRUARY2007.

10 LM5116 SubmitDocumentationFeedbackCopyright 2007 2015, for TJ= 25 C only,representthe mostlikelyparametricnormat TJ= 25 C, and are providedfor referencepurposesonly;minimumand maximumlimitsapplyoverthe junctiontemperaturerangeof 40 C to 125 C. Unlessotherwisespecified,the followingconditionsapply:VIN = 48 V, VCC= V, VCCX= 0 V, EN = 5 V, RT= 16 k , no load on LO SUPPLYIBIASVIN OperatingCurrentVCCX= 0 V, VIN = 48 V57mAVCCX= 0 V, VIN = 100 OperatingCurrentVCCX= 5 V, VIN = 48 5 V, VIN = 100 ShutdownCurrentEN = 0 V, VIN = 48 V110 AEN = 0 V, VIN = 100 V1 VCCREGULATORVCC(REG) = 6 0 (ON)