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MCU

LP8553

SW

FB

V

LDO

GNDs

EN

ISET

V

DDIO

PWM

SCLK

SDA

OUT1

OUT2

OUT3

OUT4

L1D1

10V ± 40V

5.5V ± 22V

FILTER

5V

FSET

15 éH

VSYNC

210 mA ± 400 mA

C

OUT

C

IN

10 éF

4.7 éF

C

VLDO

1 éF

V

DDIO

reference voltage

VSYNC signal

120 k5

100 nF

1 éF

FAULT

Can be left floating

if not used

39 pF

VIN

R

ISET

R

FSET

V

BATT

LP8553

www.ti.com

SNVS701B–SEPTEMBER2011–REVISEDJANUARY2014

LP8553High-EfficiencyLEDBacklightDriverforNotebooks

CheckforSamples:LP8553

1

FEATURES

APPLICATIONS

2

•High-VoltageDC/DCBoostConverterwith

•NotebookandNetbookLCDDisplayLED

IntegratedFETwithFourSwitchingFrequencyBacklight

Options:156/312/625/1250kHz

•LEDLighting

•2.7Vto22VInputVoltageRangetoSupport

1x…5xCellLi-IonBatteriesDESCRIPTION

TheLP8553isawhiteLEDdriverwithintegrated

•ProgrammablePWMResolution

boostconverter.Ithasfouradjustablecurrentsinks

–8to13TrueBit(SteadyState)

whichcanbecontrolledbyPWMinputorwithI

2

C-

–Additional1to3BitsUsingDithering

compatibleserialinterface.

DuringBrightnessChanges

Theboostconverterhasadaptiveoutput-voltage

•I

2

CandPWMBrightnessControl

controlbasedontheLEDdrivervoltages.This

•AutomaticPWM&CurrentDimmingfor

featureminimizesthepowerconsumptionby

ImprovedEfficiency

adjustingthevoltagetolowestsufficientlevelinall

conditions.

•PWMOutputFrequencyandLEDCurrentSet

ThroughResistors

LEDoutputshave8-bitcurrentresolutionandupto

13-bitPWMresolutionwithadditional1-3bitdithering

•OptionalSynchronizationtoDisplayV

SYNC

toachievesmoothandprecisebrightnesscontrol.

Signal

ProprietaryPhaseShiftPWMcontrolisusedforLED

•4LEDOutputswithLEDFault(Short/Open)

outputstoreducepeakcurrentfromtheboost

Detection

converter,thusmakingtheboostcapacitorssmaller.

•LowInputVoltage,Over-Temperature,Over-

ThePhaseShiftingschemealsoeliminatesaudible

noise.

CurrentDetectionandShutdown

•MinimumNumberofExternalComponents

•DSBGA25-BumpPackage,2.466x2.466x

0.6mm

TypicalApplication(1)

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2011–2014,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer