Texas Instruments LM27964 Handleiding

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LM27964

SCL

SDIO

D1A

V

IN

P

OUT

GND

R

SETA

R

SETB

I

SETB

I

SETA

C

OUT

C

IN

C

1

C

2

-+

V

IN

D2AD3AD4AD2BD1B

MAIN DISPLAYSUB DISPLAYKEYPAD LEDs

DKEY

R

SETK

I

SETK

I

2

C Compatible

Interface

VIO

LM27964

www.ti.com

SNOSAL6D–MAY2005–REVISEDMAY2013

LM27964WhiteLEDDriverSystemwithI2CCompatibleBrightnessControl

CheckforSamples:LM27964

1

FEATURES

APPLICATIONS

2

•87%PeakLEDDriveEfficiency

•MobilePhoneDisplayLighting

•0.2%CurrentMatchingbetweenCurrentSinks•MobilePhoneKeypadLighting

•Drives6LEDswithupto30mAperLEDin•PDAsBacklighting

TwoDistinctGroups,forBacklightingTwo

•GeneralLEDLighting

Displays(mainLCDandsubLCD)

•DedicatedKeypadLEDDriverwithupto80mADESCRIPTION

ofDriveCurrent

TheLM27964isacharge-pump-basedwhite-LED

driverthatisidealformobilephonedisplay

•IndependentResistor-ProgrammableCurrent

backlighting.TheLM27964candriveupto6LEDsin

Settings

parallelalongwithmultiplekeypadLEDs,withatotal

•I

2

CCompatibleBrightnessControlInterface

outputcurrentupto180mA.Regulatedinternal

•Adaptive1×-3/2×ChargePump

currentsourcesdeliverexcellentcurrentmatchingin

allLEDs.

•ExtendedLi-IonInput:2.7Vto5.5V

•SmallLowProfileIndustryStandardLeadless

TheLEDdrivercurrentsourcesaresplitintotwo

independentlycontrolledgroups.Theprimarygroup

Package,WQFN-24:(4mmx4mmx0.8mm)

(4LEDs)canbeusedtobacklightthemainphone

•LM27964SQ-ILEDPWMFrequency=10kHz,

displayandthesecondgroup(2LEDs)canbeused

LM27964SQ-CLEDPWMfrequency=23kHz

tobacklightasecondarydisplay.AsingleKeypad

LEDdrivercanpowerupto16keypadLEDswitha

currentof5mAeach.TheLM27964hasanI

2

C

compatibleinterfacethatallowstheuserto

independentlycontrolthebrightnessoneachbankof

LEDs.

TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2005–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties