參數(shù)資料
型號(hào)： LTC3541EDD-3
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)： 8/20頁
文件大小： 379K
代理商： LTC3541EDD-3
LTC3541-3
35413fc
APPLICATIO S I FOR ATIO
W
U
85°Cisapproximately0.25
Ω.TheRDS(ON)oftheN-channel
switchisapproximately0.4
Ω.Therefore,powerdissipated
bythepartisapproximately:
PD=(ILOADBUCK)2RSW(ON)+(ILOADVLDO)
(LVIN–LVOUT)=145mW
Forthe3mm
×3mmDFNpackage,theθJAis43°C/W.
Thus,thejunctiontemperatureoftheregulatoris:
TJ=85°C+(0.145)(43)=91°C
whichiswellbelowthemaximumjunctiontemperature
of125°C.
Notethatathighersupplyvoltages,thejunctiontempera-
tureislowerduetoreducedswitchresistanceRDS(ON).
PC BOARD LAYOUT CHECKLIST
Whenlayingouttheprintedcircuitboard,thefollowing
checklistshouldbeusedtoensureproperoperationofthe
LTC3541-3.Checkthefollowinginyourlayout:
1.Thepowertraces,consistingoftheGNDtrace,theSW
traceandtheVINtraceshouldbekeptshort,directand
wide.
2.Doesthe(+)plateofCINconnecttoVINascloselyas
possible?ThiscapacitorprovidestheACcurrenttothe
internalpowerMOSFETs.
3.Keeptheswitchingnode,SW,awayfromthesensitive
LFBnode.
4. Keep the (–) plates of CIN and COUT as close as
possible.
DESIGN EXAMPLE
Asadesignexample,assumetheLTC3541-3isusedin
asinglelithium-ionbatterypoweredcellularphoneap-
plication.TheVINwillbeoperatingfromamaximumof
4.2Vdowntoabout3V.Theloadcurrentrequirementis
amaximumof0.5Aforthebuckoutputbutmostofthe
timeitwillbeinstandbymode,requiringonly2mA.Ef-
ficiencyatbothlowandhighloadcurrentsisimportant.
Theoutputvoltageforthebuckis1.8V.Therequirementfor
theoutputvoltageoftheVLDOregulatoris1.575Vwhile
providingupto0.3Aofcurrent.Withthisinformationwe
cancalculateLusingEquation2:
L
f
I
V
L
OUT
IN
= ( ) Δ( )
1
(2)
SubstitutingVOUT=1.8V,VIN=3.6V(typ),ΔIL=200mA
andf=2.25MHzinEquation3gives:
L
V
MHz
mA
V
H
=
=
1 8
2 25
200
1
1 8
3 6
2
.
(
)
.
(3)
A2.2
Hinductorworkswellforthisapplication.Forbest
efficiencychoosea600mAorgreaterinductorwithless
than0.2
Ωseriesresistance.
CINwillrequireanRMScurrentratingofatleast0.25A
= ILOAD(MAX)/2 at temperature. COUT for the buck is
chosentohaveavalueof22
FandanESRoflessthan
0.25
Ω.Inmostcases,aceramiccapacitorwillsatisfy
thisrequirement.
COUTfortheVLDOregulatorischosenas2.2F.
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