Texas Instruments LP3997 Handleiding

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LP3997

V

IN

Enable

DELAY

V

OUT

Error/POR

V

IN

SD

SENSE

V

OUT

C

BYP

ERROR

2.2 PF

2.2 PF

470k

GND

1

7

6

5

4

8

2

3

0.1 PF

0.1 PF

LP3997

www.ti.com

SNVS272B–MAY2004–REVISEDMAY2013

Micropower250-mACMOSLDORegulatorWithErrorFlagandPower-On-Reset

CheckforSamples:LP3997

1

FEATURES

DESCRIPTION

TheLP3997regulatorisdesignedtomeetthe

2

•Low140-mVDropoutat250-mALoad

requirementsofportable,battery-poweredsystems,

•StableWithCeramicCapacitor.

providingaccurateoutputvoltage,lownoise,andlow

•LowNoiseWithBypassCapacitor

quiescentcurrent.TheLP3997provides3.3Voutput

atupto250mAloadcurrent.Thechiparchitectureis

•LessThan80µATypicalI

Q

at250mA

capableofprovidingoutputvoltagesaslowas0.8V.

•VirtuallyZeroI

Q

(Disabled)

Whenswitchedinshutdownmode,thepower

•ThermalandShortCircuitProtection

consumptionisvirtuallyzero.

•3.3-VOutput

(1)

TheLP3997isdesignedtobestablewithspace

•8-LeadVSSOPPackage

(2)

savingceramicoutputcapacitorassmallas1µF.

TheLP3997alsoincludesanout-of-regulationerror

APPLICATIONS

flag.Whentheoutputismorethan5%belowits

•PortableConsumerElectronics

nominalvoltage,theerrorflagsetstolow.Ifa

capacitorisconnectedtodevice’sdelaypin,a

•CellularHandsets

delayedpower-onresetsignalwillbegenerated.

•LaptopandPalmComputers

•PDAs

•DigitalCameras

(1)Forothervoltageoptions,contactyourTIsalesoffice

(2)Forotherpackageoptions,contactyourTIsalesoffice.

TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2004–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties