參數(shù)資料
型號(hào)： LTC4099EUDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝： 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 24/36頁(yè)
文件大?。?/td> 536K
代理商： LTC4099EUDC#TRPBF
LTC4099
0
4099fd
USB Inrush Limiting
VoltageovershootonVBUSmaysometimesbeobserved
whenconnectingtheLTC4099toalabpowersupply.This
overshootiscausedbylongleadsfromthepowersupply
toVBUS.Twistingthewirestogetherfromthesupplyto
VBUScangreatlyreducetheparasiticinductanceofthese
longleads,andkeepthevoltageatVBUStosafelevels.USB
cablesaregenerallymanufacturedwiththepowerleadsin
closeproximity,andthusfairlylowparasiticinductance.
Board Layout Considerations
TheExposedPadonthebacksideoftheLTC4099package
mustbesecurelysolderedtothePCboardground.This
istheprimarygroundpininthepackage,anditserves
asthereturnpathforboththecontrolcircuitryandthe
synchronousrectifier.
Furthermore, due to its high frequency switching
circuitry,itisimperativethattheinputcapacitor,inductor,
andoutputcapacitorbeasclosetotheLTC4099aspos-
sible,andthattherebean
unbrokengroundplaneunder
theLTC4099andallofitsexternalhighfrequencycompo-
nents.Highfrequencycurrents,suchastheinputcurrent
ontheLTC4099,tendtofindtheirwayonthegroundplane
alongamirrorpathdirectlybeneaththeincidentpathon
thetopoftheboard.Ifthereareslitsorcutsintheground
planeduetoothertracesonthatlayer,thecurrentwillbe
forcedtogoaroundtheslits.Ifhighfrequencycurrentsare
notallowedtoflowbackthroughtheirnaturalleast-area
path,excessivevoltagewillbuildupandradiatedemis-
sionswilloccur(seeFigure9).Thereshouldbeagroupof
viasdirectlyunderthegroundedbacksideleadingdirectly
downtoaninternalgroundplane.Tominimizeparasitic
inductance,thegroundplaneshouldbeascloseaspos-
sibletothetopplaneofthePCboard(layer2).
TheIDGATEpinfortheexternalidealdiodecontrollerhas
extremelylimiteddrivecurrent.Caremustbetakento
minimizeleakagetoadjacentPCboardtraces.100nAof
leakagefromthispinwillintroduceanadditionaloffset
totheidealdiodeofapproximately10mV.Tominimize
leakage,thetracecanbeguardedonthePCboardby
surroundingitwithVOUTconnectedmetal,whichshould
generallybelessthan1VhigherthanIDGATE.
Battery Charger Stability Considerations
TheLTC4099’sbatterychargercontainsbothaconstant-
voltage and a constant-current control loop. The con-
stant-voltage loop is stable without any compensation
whenabatteryisconnectedwithlowimpedanceleads.
Excessiveleadlength,however,mayaddenoughseries
inductancetorequireabypasscapacitorofatleast1F
fromBATtoGND.
Figure 9. Higher Frequency Ground Currents Follow
Their Incident Path. Slices in the Ground Plane Cause
High Voltage and Increased Emissions
4099 F09
applicaTions inForMaTion
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