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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)： | 6/20頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC3541EDD-3#TR |
LTC3541-3
35413fc
APPLICATIO S I FOR ATIO
W
U
orlessisrecommendedtoensurestability.TheLTC3541-3
VLDOisamicropowerdeviceandoutputtransientresponse
willbeafunctionofoutputcapacitance.Largervalues
ofoutputcapacitancedecreasethepeakdeviationsand
provideimprovedtransientresponseforlargerloadcurrent
changes.Notethatbypasscapacitorsusedtodecouple
individualcomponentspoweredbytheLTC3541-3will
increasetheeffectiveoutputcapacitorvalue.HighESR
tantalum and electrolytic capacitors may be used, but
alowESRceramiccapacitormustbeinparallelatthe
output.ThereisnominimumESRormaximumcapacitor
sizerequirement.
Extraconsiderationmustbegiventotheuseofceramic
capacitors.Ceramiccapacitorsaremanufacturedwitha
varietyofdielectrics,eachwithdifferentbehavioracross
temperature and applied voltage. The most common
dielectricsusedareZ5U,Y5V,X5RandX7R.TheZ5U
andY5Vdielectricsaregoodforprovidinghighcapaci-
tancesinasmallpackage,butexhibitlargevoltageand
temperaturecoefficientsasshowninFigures6and7.
Whenusedwitha2Vregulator,a1FY5Vcapacitorcan
loseasmuchas75%ofitsinitialcapacitanceoverthe
operatingtemperaturerange.TheX5RandX7Rdielectrics
resultinmorestablecharacteristicsandareusuallymore
suitableforuseastheoutputcapacitor.TheX7Rtypehas
betterstabilityacrosstemperature,whiletheX5Risless
expensiveandisavailableinhighervalues.Inallcases,
theoutputcapacitanceshouldneverdropbelow1For
instabilityordegradedperformancemayoccur.
EFFICIENCY CONSIDERATIONS
Generally,theefficiencyofaregulatorisequaltotheout-
putpowerdividedbytheinputpowertimes100%.Itis
oftenusefultoanalyzeindividuallosstermstodetermine
whichtermsarelimitingefficiencyandwhatifanychange
wouldyieldthegreatestimprovement.Efficiencycanbe
expressedas:
Efficiency=100%–(L1+L2+L3+...)
whereL1,L2,etc.aretheindividuallosstermsasaper-
centageofinputpower.
Althoughalldissipativeelementsinthecircuitproduce
losses,threemainsourcestypicallyaccountforthemajor-
ityofthelossesintheLTC3541-3circuits:VINquiescent
current,I2RlossesandlossacrossVLDOoutputdevice.
WhenoperatingwithboththebuckandVLDOregulator
active(ENBUCKandENVLDOequaltologichigh),VIN
quiescentcurrentlossandlossacrosstheVLDOoutput
devicedominatetheefficiencylossatlowloadcurrents,
whereastheI2RlossandlossacrosstheVLDOoutput
devicedominatetheefficiencylossatmediumtohighload
currents.Atlowloadcurrentswiththepartoperatingwith
thelinearregulator(ENBUCKequaltologiclow,ENVLDO
Figure 6. Change in Capacitor vs Bias Voltage
Figure 7. Change in Capacitor vs Temperature
Dc BIAS VOLTAGE (V)
cHANGE
IN
VALUE
(%)
35413 F06
20
0
–20
–40
–60
–80
–100
0
4
8
10
2
6
X5R
Y5V
BOTH cAPAcITORS ARE 1
F,
10V, 0603 cASE SIZE
TEMPERATURE (
°c)
–50
–100
cHANGE
IN
VALUE
(%)
–80
–60
–40
–20
X5R
Y5V
20
–25
0
25
50
35413 F07
75
0
BOTH cAPAcITORS ARE 1
F,
10V, 0603 cASE SIZE
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