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LT3071EUFD 数据表(PDF) 4 Page - Linear Technology

部件名 LT3071EUFD
功能描述  5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT3071EUFD 数据表(HTML) 4 Page - Linear Technology

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LT3071

3071f
electricAl chArActeristics The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. COUT = 15µF (Note 9), VIN = VOUT + 0.3V (Note 5), VBIAS = 2.5V unless
otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VBIASUndervoltageLockout
VBIASRising
VBIASFalling
l
l
1.1
0.9
1.55
1.4
2.1
1.7
V
V
VIN-VOUTServoVoltagebyVIOC
l
250
300
350
mV
VIOCOutputCurrent
VIN=VOUT(NOMINAL)+150mV,SourcingOutofthePin
VIN=VOUT(NOMINAL)+450mV,SinkingIntothePin
l
l
160
170
235
255
310
340
µA
µA
VILInputThreshold(Logic-0State),
VO2,VO1,VO0,MARGSEL,MARGTOL
InputFalling
l
0.25
V
VIZInputRange(Logic-ZState),
VO2,VO1,VO0,MARGSEL,MARGTOL
l
0.75
VBIAS–0.9
V
VIHInputThreshold(Logic-1State),
VO2,VO1,VO0,MARGSEL,MARGTOL
InputRising
l
VBIAS–0.25
V
InputHysteresis(BothThresholds),
VO2,VO1,VO0,MARGSEL,MARGTOL
60
mV
InputCurrentHigh,
VO2,VO1,VO0,MARGSEL,MARGTOL
VIH=VBIAS=2.5V,CurrentFlowsIntoPin
l
25
40
µA
InputCurrentLow,
VO2,VO1,VO0,MARGSEL,MARGTOL
VIL=0V,VBIAS=2.5V,CurrentFlowsOutofPin
l
25
40
µA
ENPinThreshold
VOUT=OfftoOn
VOUT=OntoOff
l
l
0.9
1.4
V
V
ENPinLogicHighCurrent
VEN=VBIAS=2.5V
l
2.5
4.0
6.5
µA
ENPinLogicLowCurrent
VEN=0V
l
0.1
µA
VBIASRippleRejection
VBIAS=VOUT+1.5VAVG,VRIPPLE=0.5VP-P,fRIPPLE=120Hz,
VIN–VOUT=300mV,IOUT=2.5A
75
dB
VINRippleRejection
(Notes3,4,5)
VBIAS=2.5V,VRIPPLE=50mVP-P,fRIPPLE=120Hz,
VIN–VOUT=300mV,IOUT=2.5A
66
dB
ReferenceVoltageNoise
(REF/BYPPin)
CREF/BYP=10nF,BW=10Hzto100kHz
10
µVRMS
OutputVoltageNoise
VOUT=1V,IOUT=5A,CREF/BYP=10nF,COUT=15µF,
BW=10Hzto100kHz
25
µVRMS
Note 1:StressesbeyondthoselistedunderAbsoluteMaximumRatings
maycausepermanentdamagetothedevice.ExposuretoanyAbsolute
MaximumRatingconditionforextendedperiodsmayaffectdevice
reliabilityandlifetime.
Note 2:TheLT3071regulatorsaretestedandspecifiedunderpulseload
conditionssuchthatTJ≅TA.TheLT3071Eis100%testedatTA=25°C.
Performanceat–40°Cand125°Cisassuredbydesign,characterization
andcorrelationwithstatisticalprocesscontrols.TheLT3071Iis
guaranteedoverthe–40°Cto125°Coperatingjunctiontemperaturerange.
TheLT3071MPis100%testedandguaranteedoverthe–55°Cto125°C
operatingjunctiontemperaturerange.
Note 3:Tomaintainproperperformanceandregulation,theBIASsupply
voltagemustbehigherthantheINsupplyvoltage.ForagivenVOUT,the
BIASvoltagemustsatisfythefollowingconditions:2.2V≤VBIAS≤3.6V
andVBIAS≥(1.25•VOUT+1V).ForVOUT≤0.95V,theminimumBIAS
voltageislimitedto2.2V.
Note 4:Operatingconditionsarelimitedbymaximumjunction
temperature.Theregulatedoutputvoltagespecificationdoesnotapply
forallpossiblecombinationsofinputvoltageandoutputcurrent.When
operatingatmaximumoutputcurrent,limittheinputvoltagerangeto
VIN<VOUT+500mV.
Note 5:TheLT3071incorporatessafeoperatingareaprotectioncircuitry.
CurrentlimitdecreasesastheVIN-VOUTvoltageincreases.Currentlimit
foldbackstartsatVIN–VOUT>500mV.SeetheTypicalPerformance
CharacteristicsforagraphofCurrentLimitvsVIN–VOUTvoltage.The
currentlimitfoldbackfeatureisindependentofthethermalshutdown
circuity.
Note 6:Dropoutvoltage,VDO,istheminimuminputtooutputvoltage
differentialataspecifiedoutputcurrent.Indropout,theoutputvoltage
equalsVIN–VDO.
Note 7:GNDpincurrentistestedwithVIN=VOUT(NOMINAL)+300mVanda
currentsourceload.VIOCisabufferedoutputdeterminedbythevalueof
VOUTasprogrammedbytheVO2-VO0pins.VIOC’soutputisindependentof
themarginingfunction.
Note 8:ReverseoutputcurrentistestedwiththeINpinsgroundedandthe
OUT+SENSEpinsforcedtotheratedoutputvoltage.Thisismeasuredas
currentintotheOUT+SENSEpins.
Note 9:FrequencyCompensation:TheLT3071mustbefrequency
compensatedatitsOUTpinswithaminimumCOUTof15µFconfigured
asaclusterof(15
×)1µFceramiccapacitorsorasagraduatedcluster
of10µF/4.7µF/2.2µFceramiccapacitorsofthesamecasesize.Linear
TechnologyonlyrecommendsX5RorX7Rdielectriccapacitors.



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