Texas Instruments LM3743 Handleiding

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SS/TRACK

COMP/EN

VCC

FB

GND

LGATE

ILIM

SW

HGATE

BOOT

+

+

C3

C4

C7

C9R4

R2

R3

C5

R1

C1

L1

Q

1

Q

2

C10

D1

R5

C8

V

IN

V

OUT

LM3743

R6

+

C2

LM3743

www.ti.com

SNVS427E–SEPTEMBER2006–REVISEDAPRIL2013

LM3743High-PerformanceSynchronousBuckControllerwithComprehensiveFault

ProtectionFeatures

CheckforSamples:LM3743

1

FEATURES

DESCRIPTION

TheLM3743isaDC-DCvoltagemodePWMbuck

2

•InputVoltageFrom3.0Vto5.5V

controllerfeaturingsynchronousrectificationat300

•OutputVoltageAdjustableDownto0.8V

kHzor1MHz.Itcandelivercurrentashighas20A

•ReferenceAccuracy:±1.75%,overFull

andstepdownfromaninputvoltagebetween3Vand

TemperatureandInputVoltageRange

5.5Vdowntoaminimumoutputvoltageof0.8V,with

a±1.75%internalreferenceaccuracy.TheLM3743

•High-SideandLow-SideN-ChannelMOSFETs

providesasetofcomprehensivefaultprotection

•SwitchingFrequencyOptionsof1MHzor300

featuressuchashigh-sidecurrentlimit,outputunder-

kHz

voltageprotection,andlow-sidecurrentlimit.When

•ComprehensiveFaultProtectionFeatures:

anyofthesefaultprotectionfeaturesareengaged,it

entersahiccupprotectionmodewhichissuitablefor

–High-SideCurrentLimit

highreliabilitysystemssuchasrackmountedservers

–Low-SideCurrentLimit

andtelecombasestationsubsystems.TheLM3743

–OutputUnder-VoltageProtection

alsoemploysaproprietarymonolithicglitchfreepre-

biasstart-upmethodsuitedforFPGAandASIClogic

•HiccupModeProtectionEliminatesThermal

devices.Anexternalprogrammablesoft-startallows

RunawayDuringFaultConditions

fortrackingandtimingflexibility.Thedriverfeatures

•ExternallyProgrammableSoft-Startwith

1.6Ωofpull-upresistanceand1Ωofpull-downdrive

TrackingCapability

resistanceforhighpowerdensityandveryefficient

powerprocessing.

•Pre-BiasStart-UpCapability

•VSSOP-10Package

APPLICATIONS

•Rack-MountServers

•TelecomBaseStations

•Routers

•Printers/Scanners

•Multi-MediaSet-TopBoxes

•FPGAs,ASICs,andDSPs

TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties