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