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(yè)數(shù)： 20/20頁(yè)
文件大小： 379K
代理商： LTC3541EDD-3
LTC3541-3
35413fc
OPERATIO
U
TheLTC3541-3containsahighefficiencysynchronous
buckconverter,averylowdropoutregulator(VLDO)and
alinearregulator.Itcanbeusedtoprovideuptotwo
outputvoltagesfromasingleinputvoltagemakingthe
LTC3541-3idealforapplicationswithlimitedboardspace.
Thecombinationandconfigurationofthesemajorblocks
withintheLTC3541-3isdeterminedbywayofthecontrol
pinsENBUCKandENVLDOasdefinedinTable1.
WiththeENBUCKpindriventoalogichighandENVLDO
driventoalogiclow,theLTC3541-3enablesthebuck
convertertoefficientlyreducethevoltageprovidedatthe
VINinputpintoanoutputvoltageof1.8Vasdeterminedby
aninternalfeedbackresistornetwork.Thebuckregulator
canbeconfiguredforPulse-SkiporBurstModeopera-
tionbydrivingtheMODEpintoalogichighorlogiclow
respectively.Thebuckregulatoriscapableofproviding
a maximum output current of 500mA, which must be
takenintoconsiderationwhenusingthebuckregulator
toprovidethepowerforboththeVLDOregulatorandfor
externalloads.
WiththeENBUCKpindriventoalogiclowandENVLDO
driventoalogichigh,theLTC3541-3enablesthelinear
regulator,providingalownoiseregulatedoutputvoltageof
1.575VattheLVOUTpinwhiledrawingminimalquiescent
currentfromtheVINinputpin.Thisfeatureallowsoutput
voltageLVOUTtobebroughtintoregulationwithoutthe
presenceoftheLVINvoltage.
WiththeENBUCKandENVLDOpinsbothdriventoalogic
high,theLTC3541-3enablesthehighefficiencybuckcon-
verterandVLDO,providingdualoutputoperationfroma
singleinputvoltage.Whenconfiguredinthismanner,the
LTC3541-3’sautostart-upsequencingfeaturewillinitally
bringtheVLDO/linearregulatoroutput(1.575V)intoregula-
tioninacontrolledmannerusingthelinearregulatorprior
toenablingthebuckoutput(1.8V)withouttheneedfor
externalpincontrol.TheLTC3541-3automaticallytransi-
tionstheVLDO/linearregulatoroutput(1.575V)fromthe
linearregulatortotheVLDOregulatorwithin20msofbuck
soft-startinitiation.Adetaileddiscussionofthetransitions
betweentheVLDOregulatorandlinearregulatorcanbe
foundintheVLDO/LinearRegulatorLoopsection.
Buck Regulator Control Loop
TheLTC3541-3internalbuckregulatorusesaconstant
frequency,currentmode,step-downarchitecture.Boththe
main(top,P-channelMOSFET)andsynchronous(bottom,
N-channelMOSFET)switchesareinternal.Duringnormal
operation,theinternalmainswitchisturnedonatthebe-
ginningofeachclockcycleprovidedtheinternalfeedback
voltagetothebuckislessthanthereferencevoltage.The
currentintotheinductorprovidedtotheloadincreases
untilthecurrentlimitisreached.Oncethecurrentlimitis
reachedthemainswitchturnsoffandtheenergystored
intheinductorflowsthroughthebottomsynchronous
switchintotheloaduntilthenextclockcycle.
Thepeakinductorcurrentisdeterminedbycomparingthe
buckfeedbacksignaltoaninternal0.8Vreference.When
theloadcurrentincreases,theoutputofthebuckand
hencethebuckfeedbacksignaldecrease.Thisdecrease
causesthepeakinductorcurrenttoincreaseuntiltheaver-
ageinductorcurrentmatchestheloadcurrent.Whilethe
mainswitchisoff,thesynchronousswitchisturnedon
untileithertheinductorcurrentstartstoreversedirection
orthebeginningofanewclockcycle.
WhentheMODEpinisdriventoalogiclow,theLTC3541-3
buckregulatoroperatesinBurstModeoperationforhigh
efficiency.Inthismode,themainswitchoperatesbased
upon load demand. In Burst Mode operation the peak
inductorcurrentissettoafixedvalue,whereeachburst
eventcanlastfromafewclockcyclesatlightloadsto
nearly continuous cycling at moderate loads. Between
bursteventsthemainswitchandanyunneededcircuitry
areturnedoff,reducingthequiescentcurrent.Inthissleep
state,theloadisbeingsuppliedsolelyfromtheoutput
capacitor.Astheoutputvoltagedroops,aninternalerror
amplifier’soutputrisesuntilawakethresholdisreached
causingthemainswitchtoagainturnon.Thisprocess
repeatsataratethatisdependantupontheloadcurrent
demand.
相關(guān)PDF資料
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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(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#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:*
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
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