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
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM27964 |
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