Texas Instruments LP2951-N Bedienungsanleitung

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SHUTDOWN

C

OUT

2.2 µF

LP2951

SHUTDOWN

GND

OUT

ERROR

IN

V

OUT

V

IN

C

IN

1 µF

SENSE

VTAP

FEEDBACK

V

FEEDBACK

R1

330 k

V

OUT

V

IN

C

IN

1 µF

OUT

GND

IN

C

OUT

2.2 µF

LP2950

V

OUT

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP2950-N

,

LP2951-N

SNVS764Q–JANUARY2000–REVISEDDECEMBER2017

LP295x-NSeriesofAdjustableMicropowerVoltageRegulators

1

1Features

1

•InputVoltageRange:2.3Vto30V

•5-V,3-V,and3.3-VOutputVoltageVersions

Available

•HighAccuracyOutputVoltage

•Ensured100-mAOutputCurrent

•ExtremelyLowQuiescentCurrent

•LowDropoutVoltage

•ExtremelyTightLoadandLineRegulation

•VeryLowTemperatureCoefficient

•UseasRegulatororReference

•NeedsMinimumCapacitanceforStability

•CurrentandThermalLimiting

•StableWithLow-ESROutputCapacitors(10mΩ

to6Ω)

•LP2951-NVersionsOnly:

–ErrorFlagWarnsofOutputDropout

–Logic-ControlledElectronicShutdown

–OutputProgrammableFrom1.24Vto29V

2Applications

•High-EfficiencyLinearRegulator

•RegulatorwithUndervoltageShutdown

•LowDropoutBattery-poweredRegulator

•Snap-ON/Snap-OFFRegulator

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LP2951SimplifiedSchematic

3Description

TheLP2950-NandLP2951-Naremicropower

voltageregulatorswithverylowquiescentcurrent

(75µAtypical)andverylowdropoutvoltage(typical

40mVatlightloadsand380mVat100mA).They

areideallysuitedforuseinbattery-poweredsystems.

Furthermore,thequiescentcurrentofthedevice

increasesonlyslightlyindropout,prolongingbattery

life.

CarefuldesignoftheLP2950-N/LP2951-Nhas

minimizedallcontributionstotheerrorbudget.This

includesatightinitialtolerance(0.5%typical),

extremelygoodloadandlineregulation(0.05%

typical)andaverylowoutputvoltagetemperature

coefficient,makingthepartusefulasalow-power

voltagereference.

Onesuchfeatureisanerrorflagoutputwhichwarns

ofalowoutputvoltage,oftenduetofallingbatteries

ontheinput.Itmaybeusedforapower-onreset.A

secondfeatureisthelogic-compatibleshutdowninput

whichenablestheregulatortobeswitchedonand

off.Also,thepartmaybepin-strappedfora5-V,3-V,

or3.3-Voutput(dependingontheversion),or

programmedfrom1.24Vto29Vwithanexternal

pairofresistors.

TheLP2950-Nisavailableinthesurface-mountTO-

252packageandinthepopular3-pinTO-92package

forpin-compatibilitywitholder5-Vregulators.The8-

pinLP2951-Nisavailableinplastic,ceramicdual-in-

line,WSON,ormetalcanpackagesandoffers

additionalsystemfunctions.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP2950-N

TO-92(3)4.30mm×4.30mm

TO-252(3)9.91mm×6.58mm

LP2951-N

SOIC(8)4.90mm×3.91mm

VSSOP(8)3.00mm×3.00mm

WSON(8)4.00mm×4.00mm

PDIP(8)9.81mm×6.35mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

LP2950-NSimplifiedSchematic

Produktspezifikationen