參數(shù)資料
型號(hào)： LTC3541EDD-3#TR
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, PLASTIC, M0-229WEED-2, DFN-10
文件頁(yè)數(shù)： 2/20頁(yè)
文件大小： 379K
代理商： LTC3541EDD-3#TR
LTC3541-3
0
35413fc
OPERATIO
U
WhentheMODEpinisdriventoalogichightheLTC3541-3
operatesinPulse-Skipmodeforlowoutputvoltageripple.
In this mode, the LTC3541-3 continues to switch at a
constantfrequencydowntoverylowcurrents,whereit
willbeginskippingpulsesusedtocontrolthemain(top)
switchtomaintaintheproperaverageinductorcurrent.
Iftheinputsupplyvoltageisdecreasedtoavalueap-
proachingtheoutputvoltage,thedutycycleofthebuck
isincreasedtowardmaximumon-timeand100%duty
cycle.Theoutputvoltagewillthenbedeterminedbythe
input voltage minus the voltage drop across the main
switchandtheinductor.
VLDO/Linear Regulator Loop
IntheLTC3541-3,theVLDOandlinearregulatorloops
consist of an amplifier and N-channel MOSFET output
stagesthatservotheoutputtomaintainaregulatoroutput
voltage,LVOUT.LoopconfigurationsenablingtheVLDOor
thelinearregulatorarestablewithanoutputcapacitance
aslowas2.2
Fandashighas100F.BoththeVLDO
regulatorandthelinearregulatorsarecapableofoperating
withaninputvoltage,VIN,aslowas3V.
TheVLDOregulatorisdesignedtoprovideupto300mA
ofoutputcurrentataverylowLVINtoLVOUTvoltage.This
allowsaclean,secondary,analogsupplyvoltagetobe
providedwithaminimumdropinefficiency.TheVLDO
regulatorisprovidedwiththermalprotectionthatisde-
signedtodisabletheVLDOfunctionwhentheoutput,pass
transistor’sjunctiontemperaturereachesapproximately
160°C. In addition to thermal protection, short-circuit
detectionisprovidedtodisabletheVLDOfunctionwhen
ashort-circuitconditionissensed.Thiscircuitisdesigned
suchthatanoutputcurrentofapproximately1Acanbe
providedbeforethiscircuitwilltrigger.Asdetailedinthe
ElectricalCharacteristics,theVLDOregulatorwillbeout
ofregulationwhenthiseventoccurs.Boththethermal
and short-circuit faults, when detected, are treated as
catastrophicfaultconditions.TheLTC3541-3willbereset
uponthedetectionofeitherevent.
TheN-channelMOSFETincorporatedintheVLDOregulator
hasitsdrainconnectedtotheLVINpinasshowninFigure
1.Toensurereliableoperation,theLVINvoltagemustbe
stablebeforetheVLDOregulatorisenabled.Forthecase
wherethevoltageonLVINissuppliedbythebuckregula-
tor,theinternalpowersupplysequencinglogicassures
voltagesareappliedintheappropriatemanner.Forthe
casewherethebuckisenabledbeforetheVLDOregula-
torandanexternalsupplyisusedtopowertheLVINpin,
thevoltageonLVINpinmustbestable1msbeforethe
ENVLDOpinisbroughtfromalowtoahigh.Further,the
externallysuppliedLVINmustbereducedinconjunction
withVINwheneverVINispulledloworremoved.
Thelinearregulatorisdesignedtoprovidealoweroutput
current(30mA)thanthatavailablefromtheVLDOregula-
tor.Thelinearregulator’soutput,passtransistorhasits
draintiedtotheVINrail.Thisallowsthelinearregulator
tobeturnedonpriorto,andindependentof,thebuck
regulatorwhichordinarilydrivestheVLDOregulator.The
linearregulatorisprovidedwiththermalprotectionthat
isdesignedtodisablethelinearregulatorfunctionwhen
theoutputpasstransistor’sjunctiontemperaturereaches
approximately160°C.Inadditiontothermalprotection,
short-circuitdetectionisprovidedtodisablethelinear
regulatorfunctionwhenashort-circuitconditionissensed.
Thiscircuitisdesignedsuchthatanoutputcurrentof
approximately120mAcanbeprovidedbeforethiscircuit
willtrigger.AsdetailedintheElectricalCharacteristics,
thelinearregulatorwillbeoutofregulationwhenthis
eventoccurs.Boththethermalandshort-circuitfaultsare
treatedascatastrophicfaultconditions.TheLTC3541-3
willberesetuponthedetectionofeitherevent.
TheN-channelMOSFETincorporatedinthelinearregulator
hasitsdrainconnectedtotheVINpinasshowninFigure
1.ThesizeoftheseMOSFETsandtheirassociatedpower
bussingisdesignedtoaccommodate30mAofDCcurrent.
Currentsabovethisvaluecanbesupportedforshortperiods
asstipulatedintheAbsoluteMaximumRatings.
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