Texas Instruments LP3875 Bedienungsanleitung

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LP3872

,

LP3875

SNVS227H–FEBRUARY2003–REVISEDJANUARY2015

LP387x1.5-AFastUltra-Low-DropoutLinearRegulators

1Features3Description

TheLP387xseriesoffastultralow-dropoutlinear

1

•InputVoltageRange:2.5Vto7V

regulatorsoperatefroma2.5-Vto7-Vinputsupply.

•UltraLow-DropoutVoltage

Widerangeofpresetoutputvoltageoptionsare

•LowGroundPinCurrent

available.Theseultralow-dropoutlinearregulators

respondveryquicklytostepchangesinload,which

•LoadRegulationof0.06%

makesthemsuitableforlow-voltagemicroprocessor

•10-nAQuiescentCurrentinShutdownMode

applications.TheLP3872andLP3875aredeveloped

•EnsuredOutputCurrentof1.5-ADC

onaCMOSprocesswhichallowslowquiescent

currentoperationindependentofoutputloadcurrent.

•AvailableinDDPAK/TO-263,TO-220,and

ThisCMOSprocessalsoallowstheLP3872and

SOT-223Packages

LP3875tooperateunderextremelylowdropout

•OutputVoltageAccuracy±1.5%

conditions.

•ERRORFlagforOutputStatus

DropoutVoltage:Ultralow-dropoutvoltage;typically

•SenseOptionImprovesLoadRegulation

38mVat150-mAloadcurrentand380mVat1.5-A

•MinimumOutputCapacitorRequirements

loadcurrent.

•Overtemperature/OvercurrentProtection

GroundPinCurrent:Typically6mAat1.5-Aload

•−40°Cto125°CJunctionTemperatureRange

current.

ShutdownMode:Typically10-nAquiescentcurrent

2Applications

whentheSDpinispulledlow.

•MicroprocessorPowerSupplies

ERRORFlag:ERRORflaggoeslowwhentheoutput

•GTL,GTL+,BTL,andSSTLBusTerminators

voltagedrops10%belownominalvalue(LP3872

•PowerSuppliesforDSPs

only).

•SCSITerminators

SENSE:Sensepinimprovesregulationatremote

•PostRegulators

loads(LP3875only).

•HighEfficiencyLinearRegulators

PrecisionOutputVoltage:Multipleoutputvoltage

optionsareavailablerangingfrom1.8Vto5Vwitha

•BatteryChargers

specifiedaccuracyof±1.5%atroomtemperature,

•OtherBattery-PoweredApplications

and±3.0%overallconditions(varyingline,load,and

space

temperature).

space

DeviceInformation

(1)

space

PARTNUMBERPACKAGEBODYSIZE(NOM)

space

SOT-223(5)6.50mm×3.56mm

space

LP3872

TO-263(5)10.16mm×8.42mm

LP3872TypicalApplicationCircuit

SOT-223(5)6.50mm×3.56mm

LP3875TO-263(5)10.16mm×8.42mm

TO-220(5)14.986mm×10.16mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

LP3875TypicalApplicationCircuit

*SDandERRORpinsmustbepulledhigh

througha10-kΩpullupresistor.Connect

theERRORpintogroundifthisfunctionis

notused.SeetheShutdownModeand

ERRORFlagOperationsections.

*SDmustbepulledhighthrougha10-kΩ

pullupresistor.SeetheShutdownMode

section.

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

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