參數(shù)資料
型號(hào)： LTC3541EDD-3
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, M0-229WEED-2, DFN-10
文件頁數(shù)： 2/20頁
文件大小： 379K
代理商： LTC3541EDD-3
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.
相關(guān)PDF資料
PDF描述
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
LTC3543EDCB#PBF 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6
LTC3543EDCB#TRM 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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 帶監(jiān)控器:無 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#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 帶監(jiān)控器:無 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:*
LTC3542 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA, 2.25MHz Synchronous Step-Down DC/DC Converter
LTC3542-1 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA, 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter
LTC3542EDC#PBF 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.25MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.25MHZ, 500mA, DFN-6; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:500mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-DFN ;RoHS Compliant: Yes
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*