Texas Instruments LM3280 Handleiding

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LM3280

BYP

SVIN

LDO3

FB

C3

1 éF

EN

BUCK

EN

LDO1

EN

LDO2

EN

LDO3

V

CON

SGND

LDO2

LDO1

SW

BYPOUT

C2

4.7 éF

L1

2.2 éH

C5

1 éF

C6

1 éF

C7

1 éF

PA

BAND2

PA

BAND3

PA

BAND1

V

IN

:

2.7V to 5.5V

PGND

PVIN

C1

10 éF

V

OUT

:

0.8V to 3.6V

V

LDO1

:

2.85V

V

LDO2

:

2.85V

V

LDO3

:

2.85V

V

CON

:

0.267V to 1.200V

V

OUT

= 3 x V

CON

DAC

PA V

CC

ON/OFF

ON/OFF

ON/OFF

éPC

ON/OFF

V

RE

F

V

RE

F

V

RE

F

LM3280

www.ti.com

SNOSAU4B–OCTOBER2006–REVISEDFEBRUARY2013

LM3280AdjustableStep-DownDC-DCConverterand3LDOsforRFPowerManagement

CheckforSamples:LM3280

1

FEATURES

DESCRIPTION

TheLM3280isamulti-functionalPowerManagement

2

•2MHz(typ.)PWMSwitchingFrequency

Unit,optimizedforlow-powerhandheldapplications

•OperatesfromaSingleLi-IonCell(2.7Vto

suchasCellularPhones.

5.5V)

TheLM3280incorporatesthreelow-dropoutLDO

•AdjustableOutputVoltage(0.8Vto3.6V)DC-

voltageregulatorsandonestepdownPWMDC-DC

DC

converterwithaninternalBypassFET.Thestep

•High-EfficiencySynchronousBuckConverter

downconverter'soutputvoltagecanbesetusingan

analoginput(V

CON

)foroptimizingefficiencyoftheRF

•300mAMaximumLoadCapability(PWMMode)

PAatvariouspowerlevels.TheLDOoperatesa

•500mAMaximumLoadCapability(Bypass

nominaloutputvoltageof2.85Vandmaximumload

mode)

currentcapabilityof20mAforareferencevoltage

•PWM,ForcedandAutomaticBypassMode

requiredbylinearRFpoweramplifiers.TheLM3280

additionallyfeaturesaseparateenablepinforeach

•3Low-DropoutandFastTransientResponse

output.

LDOs

•16-pinDSBGAPackageTheLM3280isavailableina16-pinleadfreeDSBGA

package.

•CurrentOverloadProtection

•ThermalOverloadProtection

APPLICATIONS

•CellularPhones

•Hand-HeldRadios

•BatteryPoweredRFDevices

TypicalApplication

Figure1.LM3280TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties