Texas Instruments LM2756 Handleiding

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LM2756

D1A

V

IN

V

OUT

-+

D2A

D3AD4A

D53

I

2

C Control

Signals

D1B

SDIO

1 µF

1 µF

1 µF

1 µF

GND

D62

C1+

C1-

C2+

C2-

SCL

D1C

HWEN

GROUP A

GROUP B

GROUP C

I

SET

Capacitors: Murata GNM1M2R61C105ME18D 1 µF dual

capacitors, or 1 µF single capacitor equivalent

LM2756

www.ti.com

SNVS504C–JULY2007–REVISEDMAY2013

LM2756Multi-DisplayInductorlessLEDDriverwith32ExponentialDimmingStepsin

DSBGA

CheckforSamples:LM2756

1

FEATURES

APPLICATIONS

2

•Drivesupto8LEDswithupto30mAofDiode

•DualDisplayLCDBacklightingforPortable

CurrentEachApplications

•32ExponentialDimmingStepswith800:1•LargeFormatLCDBacklighting

DimmingRatioforGroupA(Upto6LEDs)

•DisplayBacklightingwithIndicatorLight

•8LinearDimmingStatesforGroupsB(Upto3

LEDs)andD1C(1LED)DESCRIPTION

TheLM2756isahighlyintegrated,switched-

•ProgrammableAuto-DimmingFunction

capacitor,multi-displayLEDdriverthatcandriveup

•3IndependentlyControlledLEDGroupsVia

to8LEDsinparallelwithatotaloutputcurrentof

I

2

CCompatibleInterface

180mA.Regulatedinternalcurrentsourcesdeliver

•Upto90%Efficiency

excellentcurrentandbrightnessmatchinginallLEDs.

•TotalSolutionSize<21mm

2

TheLEDdrivercurrentsinksaresplitintothree

•LowProfile20BumpDSBGAPackage

independentlycontrolledgroups.Theprimarygroup

(1.615mm×2.015mm×0.6mm)

(GroupA)canbeconfiguredtodrivefour,fiveorsix

LEDsforuseinthemainphonedisplay,whilethe

•0.4%AccurateCurrentMatching

secondarygroup(GroupB)canbeconfiguredto

•InternalSoft-StartLimitsInrushCurrent

driveone,twoorthreeLEDsfordrivingsecondary

•TrueShutdownIsolationforLED’s

displays,keypadsand/orindicatorLEDs.An

additionaldriver,D1C,isprovidedforadditional

•WideInputVoltageRange(2.7Vto5.5V)

indicatorlightingfunctions.

•ActiveHighHardwareEnable

TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2007–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties