42 V Input, 3.5 A, Step Down DC-DC Converter …

1 SWVINGNDBOOTFBCOMPTPS54340 ENRT/CLKVINVOUTR1R3 Copyright 2016, Texas Instruments - Output Current - AOEfficiency - % 5 VOUTV= 12 Vsw = 600 kHzINfProductFolderOrderNowTechnicalDocu mentsTools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand OCTOBER2012 REVISEDMARCH2017 TPS5434042 V input , A, step down DC-DCConverterwith Eco-mode 11 Features1 V to 42 V (45 V Abs Max)InputRange A ContinuousCurrent, A MinimumPeakInductorCurrentLimit CurrentModeControlDC-DCConverter 92-m High-SideMOSFET HighEfficiencyat LightLoadswith PulseSkippingEco-mode Low Dropoutat LightLoadswith IntegratedBOOTR echargeFET 146 A OperatingQuiescentCurrent 1 A ShutdownCurrent 100 kHz to MHzFixedSwitchingFrequency Synchronizesto ExternalClock AdjustableUVLOV oltageand Hysteresis InternalSoft-Start AccurateCycle-by-CycleCurrentLimit Thermal,Overvoltage.

2 And FrequencyFoldbackProtection V 1% InternalVoltageReference 8-TerminalHSOP with PowerPAD Package 40 C to 150 C TJOperatingRange Createa CustomDesignwith WEBENCHT ools2 Applications12V, 24V Industrial,AutomotiveandCommunicationsPo werSystems3 DescriptionThe TPS54340is a 42 V, A, stepdownregulatorwithan to 45 V per ISO ripplepulseskipmodereducesthe no loadsupplycurrentto 146 A. Shutdownsupplycurrentisreducedto 1 A whenthe enablepin is internallyset at V but canbe increasedusingthe enablepin.

3 The outputvoltagestartup rampis internallycontrolledto provideacontrolledstartup and wideswitchingfrequencyrangeallowseithere fficiencyor externalcomponentsize to be thermalshutdownprotectsinternaland externalcomponentsduringan TPS54340is availablein an 8-terminalthermallyenhancedHSOPP owerPAD (8) x mmspacerSimplifiedSchematicEfficiencyvs LoadCurrent2 TPS54340 SLVSBK0D OCTOBER2012 :TPS54340 SubmitDocumentationFeedbackCopyright 2012 2017,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (June2016)to RevisionDPage ChangedVINMIN V To: VO+ VDO, and addedNote1 in Updatedtext and addedEquation1 in theLow DropoutOperationand BootstrapVoltage(BOOT).

4 13 Deletedtext: "The startand stop voltagefor a typical5 " and Figure:"5V Start/StopVoltage" fromtheLowDropoutOperationand BootstrapVoltage(BOOT) Addednew Deleted2 graphsnamed"Low DropoutOperation" (March2014)to RevisionCPage ChangedpackageHSOICTo: HSOPin theFeaturesand throughoutthe MovedStoragetemperatureto theAbsoluteMaximumRatings(1) ChangedtheHandlingRatingstableto ChangedOutputcurrentMAXvalueFrom:5 A To: A in ChangedErroramplifiertransconductanceuni tsfrom Mhosto S in ChangedEquation7 and Equation8.

5 15 ChangedEquation27 ..24 ChangesfromRevisionA (February2013)to RevisionBPage Changedthe datasheetto the new TI Changedthe ApplicationList From:12 V, 24 V and 48 V IndustrialTo: 12 V, 24 V Addedthe Addedthe Addedthe ThermalInformationtableinsidethe Changedthe Operating:nonswitchingsupplycurrentTESTC ONDITIONSFrom:FB = To: FB = V .. OCTOBER2012 REVISEDMARCH2017 ProductFolderLinks:TPS54340 SubmitDocumentationFeedbackCopyright 2012 2017,TexasInstrumentsIncorporated ChangedRT/CLKhigh V To: 2 V.

6 6 ChangedFigure6 title From:HIGHFREQUENCYRANGETo: ChangedFigure7 title From:LOWFREQUENCYRANGETo: Addedthe (October2012)to RevisionAPage ChangedFigure11 From:IEN( V) To: IEN( A) ..8 ChangedFigure12 From:IEN( V) To: IEN( A) ..8 GND7 COMP6FB5SW82341 VINENRT/CLKBOOTP owerPAD94 TPS54340 SLVSBK0D OCTOBER2012 :TPS54340 SubmitDocumentationFeedbackCopyright 2012 2017,TexasInstrumentsIncorporated5 Pin Configurationand FunctionsDDAP ackage8-Pin(HSOP)(TopView)Pin bootstrapcapacitoris requiredbetweenBOOTand SW.

7 If the voltageon this capacitoris belowtheminimumrequiredto operatethe high side MOSFET,the outputis switchedoff until the V to 42 V , with V to two theEnableand internalamplifierholdsthis terminalat a fixedvoltagewhenusinganexternalresistort o groundto set the the terminalis pulledabovethe PLL upperthreshold,a modechangeoccursand the terminalbecomesa internalamplifierisdisabledand the terminalis a high impedanceclockinputto the clockingedgesstop,theinternalamplifieris re-enabledand the operatingmodereturnsto the transconductance(gm) inputto the outputswitchcurrent(PWM) this GroundSW8 IThe sourceof the internalhigh-sidepowerMOSFETand switchingnodeof the GNDterminalmustbe electricallyconnectedto the exposedpad on the printedcircuitboardfor OCTOBER2012 REVISEDMARCH2017 ProductFolderLinks.

8 TPS54340 SubmitDocumentationFeedbackCopyright 2012 2017,TexasInstrumentsIncorporated(1)Stre ssesbeyondthoselistedunderabsolutemaximu mratingsmay causepermanentdamageto the stressratingsonly and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder recommendedoperatingconditionsis not absolute-maximum-ratedconditionsfor extendedperiodsmay (1)overoperatingfree-airtemperaturerange (unlessotherwisenoted)MINMAXUNITI nputvoltageVIN , 10-nsTransient 245 Operatingjunctiontemperature 40150 CStoragetemperature,TSTG 65150 C(1)Electrostaticdischarge(ESD)to measuredevicesensitivityand immunityto damagecausedby assemblyline electrostaticdischargesinto the device.

9 (2)Levellistedaboveis the passinglevelper ANSI/ 500 VHBM allowssafemanufacturingwith a 1000 Vmay actuallyhavehigherperformance.(3)Levelli stedaboveis the passinglevelper 250 VCDM allowssafemanufacturingwith a 250 Vmay (1)HumanBodyModel(HBM)ESDS tressVoltage(2) 2000 VChargedDeviceModel(HBM)ESDS tressVoltage(3) 500(1)See (unlessotherwisenoted)MINMAXUNITVINS upplyinputvoltage(1)VO+ 40150 C(1)For moreinformationabouttraditionaland new thermalmetrics,see theSemiconductorand IC PackageThermalMetricsapplicationreport.

10 (2)Powerratingat a specificambienttemperatureTAshouldbe determinedwith a junctiontemperatureof 150 C. This is the pointwheredistortionstartsto powerdissipationestimatein applicationsectionof this datasheetfor (1)(2)TPS54340 UNITDDA(8 PINS) JAJunction-to-ambientthermalresistance(s tandardboard) C/W C/W C/W JCtopJunction-to-case(top) C/W JCbotJunction-to-case(bottom) C/W C/W6 TPS54340 SLVSBK0D OCTOBER2012 :TPS54340 SubmitDocumentationFeedbackCopyright 2012 2017,TexasInstrumentsIncorporated(1)Open Loopcurrentlimit measureddirectlyat the SW terminaland is independentof the inductorvalueand 40 C to 150 C, VIN = V to 42 V (unlessotherwisenoted)PARAMETERTESTCONDI TIONSMINTYPMAXUNITSUPPLYVOLTAGE(VINTERMI NAL) = 0 V, 25 C, V VIN 42 AOperating.