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
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM3280 |
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