SLF7045T-101MR60-1

SM74304 TI1 | Alldatasheet

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www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 SM74304HighVoltage(80V)StepDownSwitchingRegulator Check forSamples: SM74304 1FEATURES PACKAGE 2• Integrated80V,0.7A N-Channel Buck Switch • VSSOP-8

• InternalHV Vcc Regulator • WSON-8 (4mm x 4mm)
• No ControlLoop Compensation Required DESCRIPTION• Ultra-FastTransientResponse The SM74304 Step Down Switching Regulator• On Time VariesInverselywithLineVoltage featuresallofthefunctionsneeded toimplementlow
• OperatingFrequency NearlyConstant with cost,efficient,Buck biasregulators.Thishighvoltage VaryingLineVoltage regulatorcontainsan 80 V, 0.7A N-Channel Buck Switch.The deviceiseasy toapplyand isprovidedin• AdjustableOutput Voltage the VSSOP-8 and the thermallyenhanced WSON-8• HighlyEfficientOperation packages. The regulatoris based on a hysteretic
• PrecisionReference control scheme using an on time inversely proportionaltoVIN.Thisfeatureallowstheoperating• Low Bias Current frequencytoremainrelativelyconstantwithloadand• IntelligentCurrentLimitProtection input voltage variations.The hystereticcontrol
• Thermal Shutdown requires no control loop compensation, while providingvery fast load transientresponse. An• ExternalShutdown Control intelligentcurrent limitis implemented in the SM74304 with forced off time that is inverselyTYPICAL APPLICATIONS proportionalto VOUT . This currentlimitingscheme
• Non-IsolatedBuck Regulator reduces load currentfoldback.Additionalprotection features include: Thermal Shutdown, Vcc• Secondary High VoltagePost Regulator undervoltage lockout, gate drive undervoltage• PhotovoltaicSystems lockout,and Max DutyCyclelimiter. Connection Diagram Figure1. 8-Lead VSSOP, WSON Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 2011–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.

2.5V THERMAL SHUTDOWN 0.725A BUCK SWITCH CURRENT SENSE COMPLETE R CL STARTR CL COMPLETE START Ron 100P 15P 3.01k 100k 200k 0.01P 0.1P 12 - 75V 10V SM74304 UVLO FB R6 UVLO REGULATION COMPARATOR OVER-VOLTAGE COMPARATOR 2.875V SD SD COMPLETE START 300 ns MIN OFF TIMER 7V SERIES REGULATOR CURRENT LIMIT OFF TIMER SHUTDOWN 0.1P, 100V QCLR Q SET S R SM74304 SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com TypicalApplicationCircuitand Block Diagram PIN DESCRIPTIONS Pin Name Description ApplicationInformation 1 SW SwitchingNode Power switchingnode.ConnecttotheLC outputfilter.

2 BST BoostBoot–strapcapacitorinput An externalcapacitorisrequiredbetween theBST and

theSW pins.A 0.01uFceramiccapacitoris recommended. An internaldiodebetween Vcc and BST completestheBuck gatedrivebiasnetwork.

3 R CL CurrentLimitOFF timeprogrammingpin A resistorbetween thispinand RTN determinesthe

Toff= 10-5 /(0.59+ (FB /7.22x 10− 6 x R CL )) variationofofftime,alongwiththeFB pinvoltage,per cyclewhileincurrentlimit.The offtimeispresetto17uS ifFB =0V and decreasesas theFB pinvoltageincreases.

4 RTN CircuitGround

5 FB Feedback SignalfromRegulatedOutput Thispinisconnectedtotheinvertinginputoftheinternal

regulationcomparator.The regulationthresholdis2.5V.

6 R ON On timesetpin A resistorbetween thispinand Vinsetstheswitchon

Ton = 1.42x 10-10 R ON /Vin timeas a functionofVin.The minimum recommended on timeis300ns atthemaximum inputvoltage. 7 Vcc Outputfromtheinternalhighvoltagebiasregulator. Ifan auxiliaryvoltageisavailabletoraisethevoltageon VCC isnominallyregulatedto7 Volts thispin,above theregulationsetpoint(7V),theinternal seriespass regulatorwillshutdown,reducingtheIC power dissipation.Do notexceed 14V.Thisoutput providesgatedrivepower fortheinternalBuck switch.An internaldiodeisprovidedbetween thispinand theBST pin.A local0.1uFdecouplingcapacitorisrecommended. Seriespass regulatoriscurrentlimitedto10mA. 8 Vin Inputsupplyvoltage Recommended operatingrange:9V to75V. - EP Exposed PAD, undersideoftheWSON package Internallybonded tothediesubstrate.ConnecttoGND option potentialforlowthermalimpedance.

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www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. AbsoluteMaximum Ratings (1)(2) VIN toGND 80V BST toGND 94V SW toGND (SteadyState) -1V ESD Rating(3) Human Body Model 2kV Machine Model 200V BST toVCC 80V BST toSW 14V VCC toGND 14V AllOtherInputstoGND -0.3to7V Lead Temperature(Soldering4 sec) 260°C StorageTemperatureRange -55°C to+150°C (1) AbsoluteMaximum Ratingsarelimitsbeyond whichdamage tothedevicemay occur.OperatingRatingsareconditionsunderwhich operationofthedeviceisintendedtobe functional.Forspecificationsand testconditions,see theElectricalCharacteristics. (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTISalesOffice/Distributorsforavailabilityand specifications. (3) The human body model isa 100pF capacitordischargethrougha 1.5kΩ resistorintoeach pin.The machine model isa 200pF capacitor dischargeddirectlyintoeach pin.The machine model ESD compliancelevelforPin5 is150V.The human body ESD compliancelevel forPin7 and 8 is1000V. OperatingRatings(1)(2) VIN 9V to75V JunctionTemperature −40°C to+ 125°C (1) AbsoluteMaximum Ratingsarelimitsbeyond whichdamage tothedevicemay occur.OperatingRatingsareconditionsunderwhich operationofthedeviceisintendedtobe functional.Forspecificationsand testconditions,see theElectricalCharacteristics. (2) Fordetailedinformationon solderingplasticVSSOP and WSON packages,refertothePackagingData Book availablefromTI. ElectricalCharacteristics SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperatingJunction Temperature range.VIN = 48V,unlessotherwisestated(1). Symbol Parameter Conditions Min Typ Max Units StartupRegulator VCC Reg VCC RegulatorOutput 6.6 7 7.4 V VCC CurrentLimit(2) (2) 11 mA VCC Supply VCC undervoltageLockoutVoltage(VCC 6.3 V increasing) VCC UndervoltageHysteresis 206 mV VCC UVLO Delay(filter) 3 µs OperatingCurrent(ICC) Non-Switching,FB = 3V 500 675 µA Shutdown/StandbyCurrent R ON = 0V 100 200 µA (1) Allelectricalcharacteristicshavingroom temperaturelimitsaretestedduringproductionwithTA = TJ = 25°C. Allhotand coldlimitsare specifiedby correlatingtheelectricalcharacteristicstoprocessand temperaturevariationsand applyingstatisticalprocesscontrol. (2) The VCC outputisintendedas a selfbiasfortheinternalgatedrivepower and controlcircuits.Devicethermallimitationslimitexternal loading. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:SM74304

SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com ElectricalCharacteristics(continued) SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperatingJunction Temperature range.VIN = 48V,unlessotherwisestated(1). Symbol Parameter Conditions Min Typ Max Units Switch Characteristics Buck SwitchRds(on) ITEST = 200mA, 0.74 1.34 Ω VBST −VSW = 6.3V(3) Gate DriveUVLO (VBST – VSW) Rising 3.4 4.5 5.5 V Gate DriveUVLO Hysteresis 400 mV Breakdown Voltage TJ = 25°C 80 V VIN toGround TJ = -40°C to+125°C 76 Breakdown Voltage TJ = 25°C 80 V BST toVCC TJ = -40°C to+125°C 76 CurrentLimit CurrentLimitThreshold 535 725 900 mA CurrentLimitResponse Time IswitchOverdrive= 0.1ATime to 225 ns SwitchOff OFF timegenerator(test1) FB=0V, RCL = 100K 17 µs OFF timegenerator(test2) FB=2.3V,RCL = 100K 2.65 µs On Time Generator TON -1 Vin= 10V 2.15 2.77 3.5 µs Ron = 200K TON -2 Vin= 75V 290 390 490 ns Ron = 200K Remote Shutdown Threshold Rising 0.45 0.7 1.1 V Remote Shutdown Hysteresis 40 mV Minimum OffTime Minimum OffTimer FB = 0V 300 ns Regulationand OV Comparators FB ReferenceThreshold Internalreference 2.445 2.5 2.550 V TrippointforswitchON FB Over-VoltageThreshold TrippointforswitchOFF 2.875 V FB BiasCurrent 100 nA Thermal Shutdown Tsd ThermalShutdown Temp. 165 °C ThermalShutdown Hysteresis 25 °C Thermal Resistance θJA JunctiontoAmbient (3) FordevicesprocurredintheWSON-8 package theRds(on)limitsarespecifiedby designcharacterizationdataonly.

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/c40 /c41 OUT R1 R2V 2.5 R2 /c230 /c246 /c43/c61 /c180 /c231 /c247 /c231 /c247 /c232 /c248 F = VOUT 1.42 x 10-10 x RON F = VOUT 2 x L 1 x 10-20 x RLoad x (RON )2 SM74304 www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 DetailedOperatingDescription The SM74304 Step Down SwitchingRegulatorfeaturesallof the functionsneeded to implementlow cost, efficient,Buck biasregulators.Thishighvoltageregulatorcontainsan 80V, 0.7A N-Channel Buck Switch.The deviceiseasy toapplyand isprovidedintheVSSOP-8 and thethermallyenhanced WSON-8 packages.The regulatorisbased on a hystereticcontrolscheme usingan on timeinverselyproportionalto Vin.Thisfeature allowstheoperatingfrequencytoremainrelativelyconstantwithloadand inputvoltagevariations.The hysteretic controlrequiresno controlloopcompensation,whileprovidingveryfastloadtransientresponse.An intelligent currentlimitscheme isimplementedintheSM74304 withforcedofftime,aftercurrentlimitdetection,which is inverselyproportionaltoVout.Thiscurrentlimitingscheme reducesloadcurrentfoldback.Additionalprotection featuresinclude:Thermal Shutdown,Vcc undervoltagelockout,Gate driveundervoltagelockoutand Max Duty Cycle limiter.The SM74304 can be appliedinnumerous applicationsto efficientlyregulatestepdown higher voltageinputs.This regulatoriswellsuitedforphotovoltaicelectronics,48 VoltTelecom, and the new 42V Automotivepower bus ranges. HystereticControlCircuitOverview The SM74304 isa Buck DC-DC regulatorthatuses an on timecontrolscheme. The on timeisprogrammed by an externalresistorand variesinverselywithlineinputvoltage(Vin).The core regulationelements of the SM74304 arethefeedbackcomparatorand theon timeone-shot.The regulatoroutputvoltageissensed atthe feedbackpin(FB)and iscompared toan internalreferencevoltage(2.5V).IftheFB signalisbelowthereference voltage,thebuck switchisturnedon fora fixedtimepulsedeterminedby thelinevoltageand a programming resistor(RON ).Followingthe on periodthe switchwillremain offforat leastthe minimum offtimerperiodof 300ns.IftheFB pinvoltageisstillbelow thereferenceafterthe300ns offtime,theswitchwillturnon againfor anotheron time period.This switchingbehaviorwillcontinueuntilthe FB pin voltagereaches the reference voltagelevel. The SM74304 operatesindiscontinuousconductionmode atlightloadcurrentsorcontinuousconductionmode atheavierloadcurrents.Indiscontinuousconductionmode, currentthroughtheoutputinductorstartsatzeroand ramps up toa peak valueduringthebuck switchon timeand thenback tozeroduringtheofftime.The inductor currentremains at zero untilthe next on time periodstartswhen FB fallsbelow the internalreference.In discontinuousmode theoperatingfrequencycan be relativelylow and willvarywithload.Thereforeatlightloads theconversionefficiencyismaintained,sincetheswitchinglossesdecreasewiththereductioninloadcurrent and switchingfrequency.The approximatediscontinuousmode operatingfrequencycan be calculatedas follows: (1) Incontinuousconductionmode, currentflowscontinuouslythroughtheinductorand neverramps down tozero. Inthismode theoperatingfrequencyisgreaterthanthediscontinuousmode frequencyand remainsrelatively constantwithloadand linevariations.The approximatecontinuousmode operatingfrequencycan be calculated as follows: (2) The outputvoltage(Vout)can be programmed by two externalresistorsas shown inFigure2.The regulation pointcan be calculatedas follows: (3) The feedbackcomparatorinhystereticregulatorsdepend upon the outputripplevoltageto switchthe output transistoron and offatregularintervals.Inorderfortheinternalcomparatortorespondquicklytochanges in outputvoltage,proportionalto inductorcurrent,a minimum amount of capacitorEquivalentSeriesResistance (ESR) isrequired.A ripplevoltageof 25mV to 50mV isrecommended at the feedbackpin (FB) forstable operation.Incaseswhere theintrinsiccapacitorESR istoosmall,additionalseriesresistancemay be added. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:SM74304

• + FB REF 2.5V SW L R VIN SM74304 C OUT VOUT SM74304 SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com For applicationswhere loweroutputvoltagerippleisrequiredtheloadcan be connecteddirectlytothelow ESR outputcapacitor,as shown in Figure2. The seriesresistor(R) willdegrade the load regulation.Another techniqueforenhancingthe ripplevoltageat the FB pinisto placea capacitorinparallelwiththe feedback dividerresistorR1. The additionofthecapacitorreducestheattenuationoftheripplevoltagefromthefeedback divider High VoltageBias Regulator The SM74304 containsan internalhighvoltagebiasregulator.The inputpin(Vin)can be connecteddirectlyto linevoltagesfrom9 to75 Volts.To avoidsupplyvoltagetransientsdue tolongleadinductanceson theinputpin (VinPin 8),itisalwaysrecommended toconnectlow ESR ceramicchipcapacitor(≊ 0.1µF) between "Vin"pin and "RTN" pin(pin4),locatedclosetoSM74304. The regulatorisinternallycurrentlimitedto10mA. Upon power up,theregulatorisenabledand sourcescurrentintoan externalcapacitorconnectedtotheVcc pin.When the voltageon theVcc pinreachestheregulationpointof7V,thecontrolleroutputisenabled. An externalauxiliarysupplyvoltagecan be appliedtotheVcc pin.Iftheauxiliaryvoltageisgreaterthan7 Volts theinternalregulatorwillessentiallyshutoff,thusreducinginternalpower dissipation. Figure2. Low RippleOutput Configuration

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0.01 PF 0.1 PF 10V 10k 30k SM74304 www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 Figure3. SelfBiased Configuration Over-VoltageComparator The over-voltagecomparatorisprovidedtoprotecttheoutputfrom overvoltageconditionsdue tosudden input linevoltagechanges or outputloadingchanges.The over-voltagecomparatormonitorsthe FB pinversusan internal2.875V reference(OV_REF). Ifthe voltageat FB risesabove OV_REF the comparatorimmediately terminatesthebuck switchon timepulse. ON Time generatorand Shutdown The on timeoftheSM74304 issetinverselyproportionaltotheinputvoltageby an externalresistorconnected between Ron and Vin.The Ron terminalisa low impedance inputbiasedat approximately1.5V.Thus the currentthroughtheresistorand intotheRon terminalisapproximatelyproportionaltoVinand used internallyto controlthe on timer.Thisscheme of inputvoltagefeed-forwardhystereticoperationachievesnearlyconstant operationalfrequencyovervaryinglineand loadconditions.The on timeequationfortheSM74304 is: Ton = 1.42x 10-10 x R ON /VIN (4) The R ON pinof the SM74304 alsoprovidesa shutdown functionwhich disablesthe regulatorand significantly decreasesquiescentpower dissipation.By pullingthe R ON pinto below 0.7V logicthresholdactivatesthe low power shutdown mode. The VIN quiescentcurrentintheshutdown mode isapproximately100µA internaltothe SM74304 plusthecurrentintheR ON resistor. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:SM74304

SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com Figure4. Shutdown Implementation CurrentLimit The SM74304 containsan intelligentcurrentlimitofftimerintendedtoreducethefoldbackcharacteristicinherent withfixedoff-timeover-currentprotection.IfthecurrentintheBuck switchexceeds 725mA thepresentcycleon time is immediatelyterminated(cycleby cyclecurrentlimit).Followingthe terminationof the cyclea non- resetablecurrentlimitofftimerisinitiated.The durationoftheofftimeisa functionoftheexternalresistor(RCI) and the FB pinvoltage.When the FB pinvoltageequalszero,the currentlimitofftimeisinternallypresetto 17uS.Thisconditionoccursinshortcircuitoperationwhen a maximum amount ofofftimeisrequired. Incases ofoverload(notcompleteshortcircuit)thecurrentlimitofftimecan be reducedas a functionofthe outputvoltage(measured attheFB pin).Reducing theofftimewithsmalleroverloadsreducestheamount of foldbackand alsoreducestheinitialstart-uptime.The currentlimitofftimefora givenFB pinvoltageand R CI resistorcan be calculatedby thefollowingequation: (5) Applicationsutilizinglow resistanceinductorsand/ora low voltagedroprectifiermay requirespecialevaluationat highline,shortcircuitconditions.Inthisspecialcase thepreset17uS (FB = 0V) offtimemay be insufficientto balancetheinductorvolt*timeproduct.Additionalinductorresistance,outputresistanceora largervoltagedrop rectifiermay be necessarytobalancetheinductorcyclevolt*timeproductand limittheshortcircuitcurrent. N -Channel Buck Switch and Driver The SM74304 integratesan N-Channel Buck switchand associatedfloatinghighvoltagegatedriver.Thisgate drivercircuitworks inconjunctionwithan externalbootstrapcapacitorand an internalhighvoltagediode.The bootstrapcapacitorischarged by VCC throughthe internalhigh voltagediode.A 0.01uF ceramiccapacitor connectedbetween theBST pinand SW pinisrecommended. Duringeach cyclewhen theBuck switchturnsoff,theSW pinisapproximately0V. When theSW pinvoltageis low,thebootstrapcapacitorwillbe chargedfrom Vcc throughtheinternaldiode.The minimum offtimer,setto 300ns,ensuresthattherewillbe a minimum intervaleverycycletorechargethebootstrapcapacitor. An externalre-circulatingdiodefrom theSW pintoground isnecessarytocarrytheinductorcurrentafterthe internalBuck switchturnsoff.Thisexternaldiodemust be oftheUltra-fastor Schottkytypetoreduceturn-on lossesand currentover-shoot.The reversevoltageratingof the re-circulatingdiodemust be greaterthan the maximum lineinputvoltage.

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www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 Thermal Protection InternalThermalShutdown circuitryisprovidedtoprotecttheintegratedcircuitintheeventthemaximum junction temperatureisexceeded.When thermalprotectionisactivated,typicallyat165 degreesCelsius,thecontrolleris forcedintoa low power resetstate,disablingtheoutputdriver.Thisfeatureisprovidedtopreventcatastrophic failuresfromaccidentaldeviceoverheating. Minimum Load Current A minimum loadcurrentof1 mA isrequiredtomaintainproperoperation.Iftheloadcurrentfallsbelowthatlevel, thebootstrapcapacitormay dischargeduringthelongoff-time,and thecircuitwilleithershutdown,or cycleon and offata low frequency.Iftheloadcurrentisexpectedtodrop below 1 mA intheapplication,thefeedback resistorsshouldbe chosen lowenough invalueso theyprovidetheminimum requiredcurrentatnominalVout. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:SM74304

VIN (V) 0.5 1.5 2.5 3.5 4.5 TON (us) 300k 200k 100k LOAD (A) 100 EFFICIENCY (%) VIN = 15V VIN = 70V VIN = 30V VIN = 50V 0 0.5 1 1.5 2 2.5 VFB (V) TOFF (Ps) 600k 400k 200k 100k 50k SM74304 SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com TYPICAL CHARACTERISTICS Figure5.OperationalWaveforms Figure6.OperationalWaveforms SM74304 Operation:VOUT = 10V,VIN = 20V,IOUT = 250mA, SM74304 Operation:VOUT = 10V,VIN = 75V,IOUT = 250mA, CH1: Switch Node, CH2: VOUT (AC),CH4: InductorCurrent CH1: Switch Node, CH2: VOUT (AC),CH4: InductorCurrent Figure7.SM74304 10V Output Efficiency Figure8.CurrentLimitVFB vs TOFF R CL = 50k -600k Figure9.VIN vs TON R ON = 100k,200k,300k

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www.ti.com SNVS720A –OCTOBER 2011–REVISED APRIL 2013 Table1.10V,400mA Design BillofMaterials ITEM PART NUMBER DESCRIPTION VALUE C1 C4532X7R2A105M CAPACITOR, CER, TDK 1µ,100V C2 C4532X7R1E156M CAPACITOR, CER, TDK 15µ,25V C3 C1206C104K5RAC CAPACITOR, CER, KEMET 0.1µ,50V C4 C1206C103K5RAC CAPACITOR, CER, KEMET 0.01µ,50V C5 C3216X7R2A104KT CAPACITOR, CER, TDK 0.1µ,100V D1 MURA110T3 DIODE, 100V,ON SEMI L1 SLF7045T-101MR60-1 BUCK INDUCTOR, TDK 100µH R1 CRCW12062003F RESISTOR 200K R2 CRCW12061003F RESISTOR 100K R3 CRCW12063011F RESISTOR 3.01K R4 CRCW12061001F RESISTOR 1K R5 CRCW12061R00F RESISTOR 1 U1 SM74304 REGULATOR, TI Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:SM74304

SNVS720A –OCTOBER 2011–REVISED APRIL 2013 www.ti.com

REVISION HISTORY

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