Texas Instruments LM2773 Handleiding

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LM2773

V

IN

V

OUT

EN

Capacitors: 1 PF - C1005 (0402), X5R, 6.3V

4.7 PF - C1608 (0603), X5R, 6.3V

or equivalent

V

IN

= 2.5V to

5.5V

C1

1 PF

C

IN

1 PF

C

OUT

4.7 PF

V

OUT

: 1.8V or 1.6V

I

OUT

up to 300 mA

C1+

C1-

GND

C2

1 PF

C2+

C2-

SEL

LM2773

www.ti.com

SNVS554A–JANUARY2008–REVISEDMAY2013

LM2773Low-Ripple1.8V/1.6VSpread-SpectrumSwitchedCapacitorStep-DownRegulator

CheckforSamples:LM2773

1

FEATURES

DESCRIPTION

TheLM2773isaswitchedcapacitorstep-down

2

•Low-NoiseSpreadSpectrumOperation

regulatorthatproducesaselectable1.8Vor1.6V

•1.8V/1.6VSelectableOutputVoltage

output.Itiscapableofsupplyingloadsupto300mA.

•2%OutputVoltageRegulation

TheLM2773operateswithaninputvoltagefrom2.5V

to5.5V,accommodating1-cellLi-Ionbatteriesand

•>75%Efficiencyin1.8VMode

chargers.

•VeryLowOutputRipple:10mV@300mA

TheLM2773utilizesaregulatedchargepumpwith

•OutputCurrentsupto300mA

gainsof2/3xand1x.Ithasverylowrippleandnoise

•2.5Vto5.5VInputVoltageRange

onboththeinputandoutputduetoitspre-regulated

•ShutdownDisconnectsLoadfromV

IN

1.15MHz(typ.)switchingfrequencyandspread

spectrumoperation.Whenoutputcurrentsarelow,

•1.15MHzSwitchingFrequency

theLM2773automaticallyswitchestoalow-ripple

•NoInductors…SmallSolutionSize

PFMregulationmodetomaintainhighefficiencyover

•ShortCircuitandThermalProtection

theentireloadrange.

•0.5mmpitch,DSBGA-9(1.511×1.511mm×

TheLM2773isavailableinTI's0.5mmpitch9-bump

0.6mm)

DSBGA.

APPLICATIONS

•PowerSupplyforDSP's,Memory,and

Microprocessors

•MobilePhonesandPagers

•DigitalCameras,PortableMusicPlayers,and

OtherPortableElectronicDevices

TypicalApplicationCircuit

Figure1.

Figure2.LM2773Efficiencyvs.

Low-DropoutLinearRegulator(LDO)Efficiency

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2008–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties