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LT3071EUFD датащи(PDF) 23 Page - Linear Technology

номер детали LT3071EUFD
подробное описание детали  5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining
PDF  28 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LT3071EUFD датащи(HTML) 23 Page - Linear Technology

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LT3071

3071f
Figure 6. 1.5V to 1.2V Linear Regulator
ApplicAtions inFormAtion
Quieting the Noise
TheLT3071offersnumerousnoiseperformanceadvan-
tages.EachLDOhasseveralsourcesofnoise.AnLDO’s
mostcriticalnoisesourceisthereference,followedby
theLDOerroramplifier.Traditionallownoiseregulators
bufferthevoltagereferenceouttoanexternalpin(usually
throughalargevalueresistor)toallowforbypassingand
noisereductionofreferencenoise.TheLT3071deviates
fromthetraditionalvoltagereferencebygeneratinga
lowvoltageVREFfromareferencecurrentintoaninter-
nal resistor
≅19k. This intermediate impedance node
(REF/BYP)facilitatesexternalfilteringdirectly.A10nFfilter
capacitorminimizesreferencenoiseto10µVRMSatthe
600mVREF/BYPpin,equivalentlya17µVcontributionto
outputnoiseatVOUT=1V.SeetheTypicalPerformance
CharacteristicsforNoisevsOutputVoltageperformance
asafunctionofCREF/BYP.
This approach also accommodates reference sharing
betweenLT3071regulatorsthatarehookedupincur-
rentsharingapplications.TheREF/BYPfiltercapacitor
delaystheinitialpower-uptimebyafactoroftheRCtime
constant.VREFremainsactiveinnapmode,thusstart-up
timeissignificantlyreducedandwellcontrolledcoming
outof
napmode(EN:LO
↑HI).
BIAS
50k
LT3071
IN
EN
VO0
VO1
330µF
2.2µF
2.2µF*
0.01µF
1k
VMON
2V AT 5A
FULL SCALE
1nF
NC
4.7µF*
3071 F06
10µF*
*X5R OR X7R CAPACITORS
PWRGD
VOUT
1.2V
5A
VO2
MARGA
IMON
VIOC
SENSE
OUT
VBIAS
2.2V TO 3.6V
VIN
1.5V
PWRGD
REF/BYP
GND



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