Texas Instruments LP3891 Bruksanvisning
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LP3891
www.ti.com
SNVS235D–SEPTEMBER2003–REVISEDAPRIL2013
LP38910.8AFast-ResponseUltraLowDropoutLinearRegulators
CheckforSamples:LP3891
1
FEATURES
DESCRIPTION
TheLP3891isahighcurrent,fastresponseregulator
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•UltraLowDropoutVoltage(100mVat0.8Atyp)
whichcanmaintainoutputvoltageregulationwith
•LowGroundPinCurrent
minimuminputtooutputvoltagedrop.Fabricatedon
•LoadRegulationof0.04%/A
aCMOSprocess,thedeviceoperatesfromtwoinput
voltages:Vbiasprovidesvoltagetodrivethegateof
•60nATypicalQuiescentCurrentinShutdown
theN-MOSpowertransistor,whileVinistheinput
•1.5%OutputAccuracy(25°C)
voltagewhichsuppliespowertotheload.Theuseof
•TO-220,DDPAK/TO-263andSOPowerPAD-8
anexternalbiasrailallowstheparttooperatefrom
Packages
ultralowVinvoltages.Unlikebipolarregulators,the
CMOSarchitectureconsumesextremelylow
•OverTemperature/OverCurrentProtection
quiescentcurrentatanyoutputloadcurrent.Theuse
•−40°Cto+125°CJunctionTemperatureRange
ofanN-MOSpowertransistorresultsinwide
bandwidth,yetminimumexternalcapacitanceis
APPLICATIONS
requiredtomaintainloopstability.
•DSPPowerSupplies
Thefasttransientresponseofthesedevicesmakes
•ServerCoreandI/OSupplies
themsuitableforuseinpoweringDSP,
MicrocontrollerCorevoltagesandSwitchMode
•PCAdd-in-Cards
PowerSupplypostregulators.Thepartsareavailable
•LocalRegulatorsinSet-TopBoxes
inTO-220,DDPAK/TO-263andSOPowerPAD-8
•MicrocontrollerPowerSupplies
packages.
•HighEfficiencyPowerSupplies
DropoutVoltage:100mV(typ)at0.8Aloadcurrent.
•SMPSPost-Regulators
GroundPinCurrent:3mA(typ)atfullload.
ShutdownCurrent:60nA(typ)whenS/Dpinislow.
PrecisionOutputVoltage:1.5%roomtemperature
accuracy.
TYPICALAPPLICATIONCIRCUIT
Atleast10µFofinputandoutputcapacitanceisrequiredforstability.
*Tantalumcapacitorsarerecommended.Aluminumelectrolyticcapacitorsmaybeusedforrestrictedtemperature
range.Seeapplicationhints.
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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2003–2013,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | ej kategoriserat |
| Modell: | LP3891 |
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