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參數(shù)資料
| 型號： | LTC3541EDD-2#TR |
| 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 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 335K |
| 代理商： | LTC3541EDD-2#TR |
LTC3541-2
35412fb
OPERATIO
U
TheLTC3541-2containsahighefficiencysynchronous
buckconverter,averylowdropoutregulator(VLDO),and
alinearregulatorthatcanbeusedtoprovideuptotwo
outputvoltagesfromasingleinputvoltagemakingthe
LTC3541-2idealforapplicationswithlimitedboardspace.
Thecombinationandconfigurationofthesemajorblocks
withintheLTC3541-2isdeterminedbywayofthecontrol
pinsENBUCKandENVLDOasdefinedinTable1.
WiththeENBUCKpindriventoalogichighandENVLDO
driventoalogiclow,theLTC3541-2enablesthebuck
converter to efficiently reduce the voltage provided at
theVINinputpintoanoutputvoltageof1.875Vwhich
issetbyaninternalfeedbackresistornetwork.Thebuck
regulatorcanbeconfiguredforPulse-SkiporBurstMode
operationbydrivingtheMODEpintoalogichighorlogic
lowrespectively.Thebuckregulatoriscapableofprovid-
ingamaximumoutputcurrentof500mA,whichmustbe
takenintoconsiderationwhenusingthebuckregulator
toprovidethepowerforboththeVLDOregulatorandfor
externalloads.
WiththeENBUCKpindriventoalogiclowandENVLDO
driventoalogichigh,theLTC3541-2enablesthelinear
regulator,providingalownoiseregulatedoutputvoltage
of1.5VattheLVOUTpinwhiledrawingminimalquiescent
currentfromtheVINinputpin.Thisfeatureallowsoutput
voltageLVOUTtobebroughtintoregulationwithoutthe
presenceoftheLVINvoltage.
With the ENBUCK and ENVLDO pins both driven to a
logic high, the LTC3541-2 enables the high efficiency
buckconverterandVLDO,providingdualoutputopera-
tionfromasingleinputvoltage.Whenconfiguredinthis
manner,theLTC3541-2’sautostart-upsequencingfeature
willbringthebuckoutput(1.875V)intoregulationina
controlledmannerpriortoenablingtheVLDOregulator
(1.5V)withouttheneedforexternalpincontrol.Adetailed
discussionofthetransitionsbetweentheVLDOregula-
torandlinearregulatorcanbefoundintheVLDO/Linear
RegulatorLoopsection.
Buck Regulator Control Loop
TheLTC3541-2internalbuckregulatorusesaconstant
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,theLTC3541-2
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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:- 標準包裝:2,500 系列:- 拓撲: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: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 驅動器: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:* 供應商設備封裝:* 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:- 標準包裝:2,500 系列:- 拓撲: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: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 驅動器: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:* 供應商設備封裝:* 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 |
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