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LTC3868EUFD-1 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC3868EUFD-1
Description  Low IQ, Dual 2-Phase Synchronous Step-Down Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3868EUFD-1 Datasheet(HTML) 9 Page - Linear Technology

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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
theSENSEandSENSE+pinsinconjunctionwithRSENSE
setthecurrenttripthreshold.


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