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VIN
C1+
C1−
C2+
C2−
EN1
EN2
地
PGND
VOUT
D1
D2
D3
D4
D5
ISET
0.47
F
0.47
F
1
F
1
F
vin = 2.7 v
至 6.5 v
TPS60230
SLVS516A–MAY2004–REVISEDJUNE2004
WHITELEDCHARGEPUMPCURRENTSOURCE
WITHPWMBRIGHTNESSCONTROL
•
regulatedoutputcurrentwith0.3%
TheTPS60230chargepumpisoptimizedforwhite
MatchingOverTemperature
ledsuppliesinbacklitcolordisplayapplications.这
deviceprovidesaconstantcurrent,setbyanexternal
•
Drivesupto5LEDsat25mAEach
电阻,foreachled.thesupplyvoltageranges
•
LEDBrightnessControlThroughPWM
from2.7vto6.5vandisideallysuitedforall
ControlSignal
applicationspoweredbyasingleli-ionbatterycellor
•
HighEfficiencybyFractionalConversion
threetofournicd,nimh,oralkalinebatterycells.
with1xand1.5xmodes
thetps60230providesupto25maperled,fora
totalof125ma,forinputvoltagesrangingfrom3.1v
•
1MHzSwitchingFrequency
to6.5v.highefficiencyisachievedbyutilizinga
•
2.7vto6.5voperatinginputvoltagerange
1x/1.5xfractionalconversiontechniqueincombi-
•
InternalSoftstartLimitsInrushCurrent
nationwithverylowdropoutcurrentsources.ad-
ditionally,thecurrentcontrolledchargepumpensures
•
LowInputRippleandLowEMI
lowinputcurrentrippleandemi.onlytwoexternal1
•
OvercurrentandOvertemperatureProtected
µfandtwo0.47µfcapacitorsarerequiredtobuilda
•
UndervoltageLockoutWithHysteresis
completesmallandlowcostpowersupplysolution.
TheTP60230switchesat1MHzoperatingfrequency
•
过激-small3mmx3mmqfnpackage
andisavailableinasmall16-pinqfn(rgt)
packagetokeepboardspacetoaminimum.
•
WhiteLEDBacklightforColorDisplaysin
cellularphones,smartphones,pdas,
handheldpcs,digitalcameras,
andCamcorders
•
KeyBacklight
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
productiondatainformationiscurrentasofpublicationdate.
copyright©2004,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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