Texas Instruments LM3501 Handleiding
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GND
FB
V
SW
V
IN
SHDN
L
22 PH
LM3501-16
V
OUT
AGND
A1
CNTRL
C3
B1
C1
C2
B3
A2
A3
<0.3V
>1.1V
V
IN
2.7V - 5.5V
Voltage
Control
R2
24:
C
OUT
1PF
Ceramic
C
IN
1PF
Ceramic
LM3501
www.ti.com
SNVS230C–DECEMBER2003–REVISEDMAY2013
LM3501SynchronousStep-upDC/DCConverterforWhiteLEDApplications
CheckforSamples:LM3501
1
FEATURES
APPLICATIONS
2
•SynchronousRectification,HighEfficiency
•LCDBiasSupplies
andnoExternalSchottkyDioderequired
•WhiteLEDBack-Lighting
•UsesSmallSurfaceMountComponents
•HandheldDevices
•CanDrive2-5WhiteLEDsinSeries(May
•DigitalCameras
FunctionwithMoreLowV
F
LEDs)
•PortableApplications
•2.7Vto7VInputRange
•TrueShutdownIsolation,noLEDLeakageDESCRIPTION
Current
TheLM3501isafixed-frequencystep-upDC/DC
converterthatisidealfordrivingwhiteLEDsfor
•DCVoltageLEDCurrentControl
displaybacklightingandotherlightingfunctions.With
•InputUndervoltageLockout
fullyintegratedsynchronousswitching(noexternal
•InternalOutputOver-VoltageProtection(OVP)
schottkydioderequired)andalowfeedbackvoltage
Circuitry,withnoExternalZenerDiode
(515mV),powerefficiencyoftheLM3501circuithas
RequiredLM3501-16:15.5VOVP;LM3501-21:
beenoptimizedforlightingapplicationsinwireless
phonesandotherportableproducts(singlecellLi-Ion
20.5VOVP.
or3-cellNiMHbatterysupplies).TheLM3501
•RequiresOnlyaSmall16V(LM3501-16)or25V
operateswithafixed1MHzswitchingfrequency.
(LM3501-21)CeramicCapacitorattheInput
Whenusedwithceramicinputandoutputcapacitors,
andOutput
theLM3501providesasmall,low-noise,low-cost
•ThermalShutdown
solution.
•0.1µAshutdownCurrent
•Small8-BumpThinDSBGAPackage
TypicalApplicationCircuit
Figure1.Typical3LEDApplication
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2003–2013,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM3501 |
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