Texas Instruments LP3905 Handleiding

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EN1

EN2

TGND

GND

LDO2

Vin2

LDO1

0.47 PF

0.47 PF

1.0 PF

Enable 1

LDO2

Output

LDO1

Output

VSupply

10 PF

10 PF

FB2

FB1

GND_B2

GND_B1

Vin1

SW1

SW2

LP3905

Buck1

Output

Buck2

Output

VSupply

2.2 PH

2.2 PH

LDO GND

BUCK GND

10 PF

SGND

Enable 2

LP3905

www.ti.com

SNVS374D–JUNE2006–REVISEDMAY2013

LP3905PowerManagementUnitForLowPowerHandheldApplications

CheckforSamples:LP3905

1

FEATURES

KEYSPECIFICATIONS

BuckRegulators

•TwoBuckRegulatorsforPoweringHigh

CurrentProcessorFunctionsorPeripheral

•FixedandAdjustableVoltageOptions,Range

Devices

1.0Vto3.3V

(1)

•TwoLinearRegulatorsforPoweringInternal

•Upto90%Efficiency

ProcessorFunctionsandI/Os

•Auto-SwitchingPFM-PWMModeandFixed

•OneEnablePinforBuck1andLinear

PWMMode

Regulators1and2

•2MHzPWMFixedSwitchingFrequency(Typ)

•SeparateEnablePinforBuck2

•600mAOutputCurrent

•ThermalandCurrentOverloadProtection

•±4%OutputVoltageAccuracyOverTemp

•Small14–PinWSONPackage(4x4mmx0.8mm)

•InternalSoftStart

•2.2µHInductor,10µFInputandOutputCaps

APPLICATIONS

LinearRegulators

•BasebandProcessors

•OutputOptionsintheRange1.5Vto3.3V

(1)

•PeripheralProcessor(Video,Audio)

•13.5µV

rms

OutputVoltageNoise

•I/OPower

•PSRR-70dB@1kHz

•FPGAPower

•±3%OutputVoltageAccuracyOverFullLine

andLoadRegulation

DESCRIPTION

•0mAto150mAOutputCurrent

LP3905isamulti-functionalPowerManagementUnit,

optimizedforlowpowerhandheldapplications.This

•C

in

=1.0µF,C

out

=0.47µFfor100mAO/P

deviceintegratestwo600mADC-DCbuckregulators

•C

in

=1.0µF,C

out

=1.0µFfor150mAO/P

andtwo150mAlinearregulators.Fixedand

•80mVDropoutVoltage

adjustablebuckoutputversionsareavailable.The

LP3905additionallyfeaturestwoenablepinsforthe

deviceoutputcontrolandisofferedinanWSON

(1)Fixedoutputvoltagedevicescanbecustomizedtofitsystem

package.requirements.PleasecontactTexasInstrumentsSalesOffice.

TypicalApplicationCircuit

Figure1.TypicalApplicationCircuit–14-PinWSONPackage

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties