參數(shù)資料
型號(hào)： LTC3541EDD-2
廠商： LINEAR TECHNOLOGY CORP
元件分類： 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, MO-229WEED-2, DFN-10
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 335K
代理商： LTC3541EDD-2
LTC3541-2
0
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OPERATIO
U
WhentheMODEpinisdriventoalogichightheLTC3541-2
operatesinPulse-Skipmodeforlowoutputvoltageripple.
In this mode, the LTC3541-2 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
IntheLTC3541-2,theVLDOandlinearregulatorloops
consist of an amplifier and N-channel MOSFET output
stagesthatservotheoutputtomaintainaregulatoroutput
voltage,LVOUT.Theinternalreferencevoltageprovidedto
theamplifieris0.4Vallowingforawiderangeofoutput
voltages.LoopconfigurationsenablingtheVLDOorthe
linearregulatorarestablewithanoutputcapacitanceas
lowas2.2
Fandashighas100F.BoththeVLDOand
thelinearregulatorsarecapableofoperatingwithaninput
voltage,VIN,aslowas2.9V.
TheVLDOregulatorisdesignedtoprovideupto300mA
ofoutputcurrentataverylowLVINtoLVOUTvoltage.This
allowsaclean,secondary,analogsupplyvoltagetobe
providedwithaminimumdropinefficiency.TheVLDO
regulatorisprovidedwiththermalprotectionthatisde-
signedtodisabletheVLDOfunctionwhentheoutput,pass
transistor’sjunctiontemperaturereachesapproximately
160°C.Inadditiontothermalprotection,short-circuit
detectionisprovidedtodisabletheVLDOfunctionwhena
short-circuitconditionissensed.Thiscircuitisdesigned
suchthatanoutputcurrentofapproximately1Acanbe
providedbeforethiscircuitwilltrigger.Asdetailedinthe
ElectricalCharacteristics,theVLDOregulatorwillbeout
ofregulationwhenthiseventoccurs.Boththethermal
andshort-circuitfaults,whendetected,aretreatedas
catastrophic fault conditions. The LTC3541-2 will be
resetuponthedetectionofeitherevent.
TheN-channelMOSFET,incorporatedintheVLDOregula-
tor,hasitsdrainconnectedtotheLVINpinasshownin
Figure1.Toensurereliableoperation,theLVINvoltage
mustbestablebeforetheVLDOregulatorisenabled.For
thecasewherethevoltageontheLVINpinissuppliedby
thebuckregulator,theinternalpowersupplysequenc-
inglogicassuresvoltagesareappliedintheappropriate
manner.Forthecasewhereanexternalsupplyisusedto
powertheLVINpin,theexternallysuppliedLVINvoltage
mustbestable1msbeforetheENVLDOisbroughtfrom
alowtoahigh.Further,theexternallysuppliedLVINmust
bereducedinconjunctionwithVINwheneverVINispulled
loworremoved.
Thelinearregulatorisdesignedtoprovidealoweroutput
currentthanthatavailablefromtheVLDOregulator.The
linearregulator’soutput,passtransistorhasitsdraintied
totheVINrail.Thisallowsthelinearregulatortobeturned
onpriorto,andindependentof,thebuckregulatorwhich
ordinarilydrivestheVLDOregulator.Thelinearregulator
isprovidedwiththermalprotectionthatisdesignedto
disablethelinearregulatorfunctionwhentheoutputpass
transistor’sjunctiontemperaturereachesapproximately
160°C. In addition to thermal protection, short-circuit
detectionisprovidedtodisablethelinearregulatorfunc-
tionwhenashort-circuitconditionissensed.Thiscircuit
isdesignedsuchthatanoutputcurrentofapproximately
120mAcanbeprovidedbeforethiscircuitwilltrigger.As
detailedintheElectricalCharacteristics,thelinearregulator
willbeoutofregulationwhenthiseventoccurs.Boththe
thermalandshort-circuitfaultsaretreatedascatastrophic
faultconditions.TheLTC3541-2willberesetuponthe
detectionofeitherevent.
TheN-channelMOSFET,incorporatedinthelinearregu-
lator,hasitsdrainconnectedtotheVINpinasshownin
Figure1.ThesizeoftheseMOSFETsandtheirassociated
powerbussingisdesignedtoaccomodate30mAofDC
current.Currentsabovethisvaluecanbesupportedfor
short periods as stipulated in the Absolute Maximum
Ratings.
相關(guān)PDF資料
PDF描述
LTC3541EDD-2#TR 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10
LTC3541EDD-3 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10
LTC3541EDD-3#TR 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10
LTC3542EDC 0.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
LTC3542ES6 0.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3541EDD-2#TRPBF 功能描述:IC REG DL BCK/LINEAR SYNC 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LTC3541EDD-3 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Buck + VLDO Regulator
LTC3541EDD-3#PBF 功能描述:IC REG DL BCK/LINEAR SYNC 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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