SC635MLTRT datasheet(9/12 Pages) SEMTECH

номер детали	SC635MLTRT

подробное описание детали	Charge Pump Flash LED Driver

PDF	12 Pages

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производитель	SEMTECH [Semtech Corporation]

домашняя страница	http://www.semtech.com

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POWER MANAGEMENT

SC635

SuggestedLayout

ThesensetracebetweenPin6andRisroutedaround

thegroundvias,allowingtheshortestgroundreturnpath

possible.ThesensetraceisconnectedtoRattheposi-

tiveterminalpadforthemostaccurateoutputpossible.

Thebottomcopperlayerismostlyagroundplanewithno

obstructionsbetweenthegroundvias.Thesmallerrect-

angletotheleftconnectstheinputpowertoVINpin1and

inputcapacitorC4.Thetwotracesatthelowerleftarefor

logicinputsFLASHandCTRL.Thetracetotherightisthe

ISETpin“sense”trace.Thesensetraceisroutedoutof

thepathofthereturninggroundcurrent.

LayoutGuidelines

Thefollowinglayoutissuggestedforatwo-layerdesign.

ThecapacitorsCandC2arethebucketcapacitorsand

eachconductsthefullloadcurrentofupto200mApulsed

foronehalfclockcycle.C3istheoutputdecouplingca-

pacitorplacedneartheSC635VOUTpin.C4isthein-

putdecouplingcapacitorplacedneartheSC635VINpin.

Multipleviasshouldbeusedwheneveritisnecessaryto

changelayersonnetsconnectingtopinsVIN,VOUT,GND,

C1-,C1+,C2-andC2+.ResistorR1isroutedwithavery

low resistance connection between R1 and GND pin 3.

BottomCopper

TopCopper

SC635MLTRT датащи(PDF) 9 Page - Semtech Corporation