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參數(shù)資料
| 型號(hào)： | LTC3541EDD-3#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, M0-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC3541EDD-3#TR |
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.
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| LTC3542EDC | 0.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LTC3542EDC#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):1MHz 電流 - 輸出:1.5A 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
| LTC3542EDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
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