Texas Instruments LM36922 Handleiding

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LM36922

SNVSA29–MAY2015

LM36922HighlyEfficientDual-StringWhiteLEDDriver

1Features3Description

TheLM36922isanultra-compact,highlyefficient,

1

•1%MatchedCurrentSinksAcross(Process,

twostringwhite-LEDdriverdesignedforLCDdisplay

Voltage,Temp)

backlighting.Thedevicecanpowerupto8series

•3%CurrentSinkAccuracyAcross(Process,

LEDsatupto25mAperstring.Anadaptivecurrent

Voltage,Temp)

regulationmethodallowsfordifferentLEDvoltagesin

eachstringwhilemaintainingcurrentregulation.

•11-BitDimmingResolution

•Upto91.6%SolutionEfficiency

TheLEDcurrentisadjustedviaanI

2

Cinterfaceor

throughalogiclevelPWMinput.ThePWMdutycycle

•DrivesfromOnetoTwoParallelLEDStringsatup

isinternallysensedandmappedtoan11-bitcurrent

to28V

thusallowingforawiderangeofPWMfrequencies

•PWMDimmingInput

andnoise-freeoperation.

•I

2

CProgrammable

Thedeviceoperatesoverthe2.5-Vto5.5-Vinput

•Selectable500-kHzand1-MHzSwitching

voltagerangeand-40°Cto85°Ctemperaturerange.

FrequencywithOptional–12%shift

•AutoSwitchFrequencyMode(250kHz,500kHz,

DeviceInformation

(1)

1MHz)

PARTNUMBERPACKAGEBODYSIZE(MAX)

•FourConfigurableOvervoltageProtection

LM36922DSBGA(12)1.755mmx1.355mm

Thresholds(17V,21V,25V,29V)

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

•FourConfigurableOvercurrentProtection

Thresholds(750mA,1000mA,1250mA,1500

space

mA)

space

•ThermalShutdownProtection

space

2Applications

space

PowerSourceforSmartPhoneandTablet

space

Backlighting

space

SimplifiedSchematic

TypicalString-to-StringMatchingvsLEDCurrent

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties