User's Guide SNVA219A–June2007–RevisedApril2013 AN-1584 LP5990 DSBGA Evaluation Board 1 Introduction ThisboardisdesignedtoallowtheevaluationoftheLP5990LowVoltageCMOSRegulator.Eachboard ispre-assembledandtestedinthefactory.TheboardcontainstheLP5990ina4bumpDSBGA,0.4mm pitchpackagewithinputandoutputcapacitorsconnectedtoGND.TheLP5990willprovidea1.8V regulatedoutputfromalowinputvoltageof2.2Vandcanprovide200mAtoanexternalload.TheLP5990 issuitableforpoweringdigitalcircuits,wheregoodtransientbehaviorisrequired. TheLP5990isdesignedtobestablewithspacesaving0402capacitorsassmallas1µF. 2 Operation Theinputvoltage,appliedbetweenV andGNDshouldbeatleast1.0Vabovetheoutputvoltagewitha IN maximumof5.5V.Inputconnectionsshouldbekeptreasonablyshort(<300mm)tominimizeinput inductanceandensureoptimumtransientperformance.Iflongerleadsareused,thenitmayberequired toincreasetheinputcapacitorvalueto2.2µF. ON/OFFcontroloftheLP5990isprovidedontheevaluationboardbyalogicsignalappliedtotheV pin. EN Aminimumof0.95VisrequiredtoguaranteethedevicetobeonandthedevicewillbeshutdownwithV EN setto0.4Vorless.IfON/OFFcontrolisnotrequired,theV pincanbeconnectedtoV . EN IN TheloadshouldbeconnectedfromtheV pintoGND. OUT Theschematicandboardlayoutareshownbelow: 3 Schematic Diagram VIN VIN 1.0 µF VOUT VOUT CIN LP5990 1.0 µF COUT VEN VEN GND Capacitor Case Size = 0402 GND Figure1.EvaluationBoardSchematic Alltrademarksarethepropertyoftheirrespectiveowners. SNVA219A–June2007–RevisedApril2013 AN-1584LP5990DSBGAEvaluationBoard 1 SubmitDocumentationFeedback Copyright©2007–2013,TexasInstrumentsIncorporated

PCBLayout www.ti.com 4 PCB Layout Figure2.EvaluationBoardComponentandPinLayout BoardSize:-1.200" x1.000" 4.1 Bill of Materials Table1.BillofMaterialsforLP5990DSBGAEvaluationBoard Item Value Qty Footprint Note U1 LP5990-X.X 1 YFQ0004 "X.X"correspondstotheoutputvoltage option. CIN 1.0µF 1 0402 X5R,InputCapacitor COUT 1.0µF 2 0402 X5R,OutputCapacitor R1 0Ω NotFitted 0603 ConnectsV toV EN IN TestPins 6 2 AN-1584LP5990DSBGAEvaluationBoard SNVA219A–June2007–RevisedApril2013 SubmitDocumentationFeedback Copyright©2007–2013,TexasInstrumentsIncorporated

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