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LTC3868EUFD-1 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3868EUFD-1 Datasheet(HTML) 9 Page - Linear Technology |
9 / 38 page LTC3868-1 38681fb pin FuncTions (QFN/SSOP) INTVCC (Pin 17/Pin 19):OutputoftheInternalLinearLow Dropout Regulator. The driver and control circuits are poweredfromthisvoltagesource.Mustbedecoupledto powergroundwithaminimumof4.7µFceramicorother low ESR capacitor. Do not use the INTVCCpinforany otherpurpose. EXTVCC (Pin 18/Pin 20): External Power Input to an Internal LDO Connected to INTVCC.ThisLDOsupplies INTVCCpower,bypassingtheinternalLDOpoweredfrom VINwheneverEXTVCCishigherthan4.7V.SeeEXTVCC ConnectionintheApplicationsInformationsection.Do notexceed14Vonthispin. PGND (Pin 19/Pin 21):DriverPowerGround.Connectsto thesourcesofbottom(synchronous)N-channelMOSFETs andthe(–)terminal(s)ofCIN. VIN (Pin 20/Pin 22):MainSupplyPin.Abypasscapaci- torshouldbetiedbetweenthispinandthesignalground pin. BG1, BG2 (Pin 21, Pin 23/Pin 16, Pin 18):HighCurrent Gate Drives for Bottom (Synchronous) N-Channel MOSFETs.Voltageswingatthesepinsisfromground toINTVCC. BOOST1, BOOST2 (Pin 22, Pin 24/Pin 15, Pin 17): BootstrappedSuppliestotheTopsideFloatingDrivers. CapacitorsareconnectedbetweentheBOOSTandSWpins andSchottkydiodesaretiedbetweentheBOOSTandINTVCC pins.VoltageswingattheBOOSTpinsisfromINTVCCto (VIN+INTVCC). SW1, SW2 (Pin 23, Pin 25/Pin 14, Pin 16):SwitchNode ConnectionstoInductors. TG1, TG2 (Pin 24, Pin 26/Pin 13, Pin 15):HighCurrent GateDrivesforTopN-ChannelMOSFETs.Thesearethe outputsoffloatingdriverswithavoltageswingequalto INTVCC–0.5Vsuperimposedontheswitchnodevoltage SW. PGOOD1 (Pin 25/Pin 27): Open-Drain Logic Output. PGOOD1ispulledtogroundwhenthevoltageontheVFB1 pinisnotwithin±10%ofitssetpoint. SS1, SS2 (Pin 26, Pin 28/Pin 12, Pin 14):ExternalSoft- StartInput.TheLTC3868-1regulatestheVFB1,2voltage tothesmallerof0.8VorthevoltageontheSS1,2pin.An internal1µApull-upcurrentsourceisconnectedtothis pin.Acapacitortogroundatthispinsetstheramptime tofinalregulatedoutputvoltage.Thispinisalsousedas theshort-circuitlatchofftimer. ITH1, ITH2 (Pin 27, Pin 1/Pin 11, Pin 13):ErrorAmplifier OutputsandSwitchingRegulatorCompensationPoints. Eachassociatedchannel’scurrentcomparatortrippoint increaseswiththiscontrolvoltage. VFB1, VFB2 (Pin 28, Pin 2/Pin 10, Pin 12):Receivesthe remotelysensedfeedbackvoltageforeachcontrollerfrom anexternalresistivedivideracrosstheoutput. SENSE1+, SENSE2+ (Pin 1, Pin 3/Pin 9, Pin 11):The(+) inputtothedifferentialcurrentcomparatorsarenormally connectedtoDCRsensingnetworksorcurrentsensing resistors.TheITHpinvoltageandcontrolledoffsetsbetween theSENSE–andSENSE+pinsinconjunctionwithRSENSE setthecurrenttripthreshold. |
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