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ELECTRICALCHARACTERISTICS
PTH08080W
SLTS235A–FEBRUARY2005–REVISEDMARCH2005
at25
°
cfree-airtemperature,v
I
=12v,v
O
=3.3v,i
O
=I
O
最大值,c
I
=100µf,c
O
=100µf(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
I
O
OutputcurrentT
一个
=85
°
c,naturalconvectionairflow02.25a
P
O
OutputpowerT
一个
=85
°
c,naturalconvectionairflow10w
设置-pointvoltagetolerancet
一个
=25
°
C
±
2
(1)
%
temperaturevariation-40
≤
T
一个
≤
+85
°
C
±
0.5%v
o
V
O
LineregulationOverV
I
范围
±
7mV
LoadregulationOverI
O
范围
±
0.13%v
o
totaloutputvoltagevariationincludesset-要点,线条,加载,-40
≤
T
一个
≤
+85
°
C3
(1)
%V
o
V
ADJ
OutputVoltageAdjustRangeOverI
O
range0.95.5v
0.9v
≤
V
O
≤
1.8v4.5v
O
x10
(2)
V
I
InputVoltageRangeOverV
O
range1.8v<v
O
≤
3.4v4.518v
3.4v<v
O
≤
5.5vv
O
+2
(2)
18
(2)
R
设置
=348
Ω
,v
O
=5v93.5%
R
设置
=1.87k
Ω
,v
O
=3.3v92%
R
设置
=3.74k
Ω
,v
O
=2.5v91%
T
一个
=25
°
c,
η
EfficiencyR
设置
=6.19k
Ω
,v
O
=2V90%
I
O
=2A
R
设置
=8.06k
Ω
,v
O
=1.8v89%
R
设置
=13k
Ω
,v
O
=1.5v87.5%
R
设置
=27.4k
Ω
,v
O
=1.2v86.5%
Outputvoltageripple20MHzbandwith30mV
PP
I
O
(trip)overcurrentthresholdreset,followedbyautorecovery3.5a
C
O
=100µf,1recoverytime50µs
一个/µsloadstep
Transientresponse
from50%to
V
O
在/undershoot70mv
100%I
O
最大值
V
I
=increasing4.354.5
UVLOUndervoltagelockoutV
V
I
=decreasing3.64
inputhighvoltage(v
IH
)v
I
–0.5open
(3)
V
inhibitcontrol(pin5)inputlowvoltage(v
IL
)–0.20.5
inputlowcurrent(i
IL
)5µa
I
I
(stby)inputstandbycurrentpins5and2connected1ma
f
S
SwitchingfrequencyOverV
I
andI
O
ranges300kHz
externalinputcapacitanceelectrolytictype(c
I
)100
(4)
µF
ceramictype(c
O
)220
µF
externaloutputcapacitancenonceramictype(c
O
)100
(5)
330
(6)
equivalentseriesresistance(nonceramic)10
(7)
m
Ω
pertelcordiasr-332,50%stress,
MTBFCalculatedreliability4810
6
Hr
T
一个
=40
°
c,groundbenign
(1)theset-pointvoltagetoleranceisaffectedbythetoleranceandstabilityofr
设置
.thestatedlimitisunconditionallymetifr
设置
hasa
toleranceof1%with100ppm/
°
corbettertemperaturestability.
(2)theminimuminputvoltageis4.5vor(v
O
+2)v,whicheverisgreater.themaximuminputvoltageis18vorv
O
x10,whicheveris
较少.
(3)thiscontrolpinhasaninternalpullupto3.3v.ifitisleftopen-电路,themoduleoperateswheninputpowerisapplied.asmall
低-泄漏(<100na)metal-oxidesemiconductorfieldeffecttransistor(场效应晶体管)isrecommendedforcontrol.seetheapplication
informationforfurtherguidance.
(4)anexternal100-µfelectrolyticcapacitorisrequiredacrosstheinput(v
I
andgnd)forproperoperation.locatethecapacitorcloseto
themodule.
(5)anexternal100-µfelectrolyticcapacitorisoptionalacrosstheoutput(v
O
andgnd).locatethecapacitorclosetothemodule.
additionalcapacitanceclosetotheloadimprovestheresponseoftheregulatortoloadtransients.
(6)thisisthecalculatedmaximumcapacitance.theminimumesrlimitationoftenresultsinalowervalue.seethecapacitorapplication
informationforfurtherguidance.
(7)thisisthetypicalesrforalltheelectrolytic(nonceramic)电容.use10m
Ω
astheminimumwhencalculatingthetotal
equivalentseriesresistance(等效串联电阻)usingthemaximumesrvaluesspecifiedbythecapacitormanufacturer.
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