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MCU

LP8552

SW

FB

V

LDO

GNDs

EN

ISET

V

DDIO

PWM

SCLK

SDA

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

L1

D1

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

0102030405060708090100

60

65

70

75

80

85

90

95

100

EFFICIENCY (%)

DUTY CYCLE (%)

VIN = 9V

VIN = 12V

Product

Folder

Sample &

Buy

Technical

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LP8552

SNVS693E–SEPTEMBER2011–REVISEDSEPTEMBER2014

LP8552High-EfficiencyLEDBacklightDriverForNotebooks

1Features3Description

TheLP8552isawhiteLEDdriverwithintegrated

1

•High-VoltageDC/DCBoostConverterwith

boostconverter.Ithassixadjustablecurrentsinks

IntegratedFETwithFourSwitchingFrequency

whichcanbecontrolledbyPWMinputorwithI

2

C-

Options:156/312/625/1250kHz

compatibleserialinterface.Theboostconverterhas

•2.7-Vto22-VInputVoltageRangetoSupport

adaptiveoutputvoltagecontrolbasedontheLED

1x…5xcellLi-IonBatteries

drivervoltages.Thisfeatureminimizesthepower

consumptionbyadjustingthevoltagetolowest

•ProgrammablePWMResolution

sufficientlevelinallconditions.

–8to13TrueBit(SteadyState)

LEDoutputshave8-bitcurrentresolutionandupto

–Additional1to3BitsUsingDitheringDuring

13-bitPWMresolutionwithadditional1-3bitdithering

BrightnessChanges

toachievesmoothandprecisebrightnesscontrol.

•I

2

C-CompatibleandPWMBrightnessControl

ProprietaryPhaseShiftPWMcontrolisusedforLED

•AutomaticPWM&CurrentDimmingforImproved

outputstoreducepeakcurrentfromtheboost

Efficiency

converter,thusmakingtheboostcapacitorssmaller.

ThePhaseShiftingschemealsoeliminatesaudible

•PWMOutputFrequencyandLEDCurrentset

noise.

throughResistors

AutomaticPWMdimmingatlowerbrightnessvalues

•OptionalSynchronizationtoDisplayV

SYNC

Signal

andcurrentdimmingathigherbrightnessvaluescan

•6LEDOutputswithLEDFault(Short/Open)

beusedtoimprovetheopticalefficiency.Internal

Detection

EEPROMisusedforstoringtheconfigurationdata.

•LowInputVoltage,Over-temperature,Overcurrent

Thismakesitpossibletohaveminimumexternal

Detection,andShutdown

componentcountandmakethesolutionverysmall.

•MinimumNumberofExternalComponents

TheLP8552hassafetyfeatureswhichmakeit

possibletodetectLEDoutputswithopenorshort

2Applications

fault.Aswelllowinputvoltageandboostovercurrent

conditionsaremonitoredandchipisturnedoffin

•NotebookandNetbookLCDDisplayLED

caseoftheseevents.Thermalde-ratingfunction

Backlight

preventsoverheatingofthedevicebyreducing

•LEDLighting

backlightbrightnesswhensettemperaturehasbeen

reached.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(MAX)

LP8552DSBGA(25)2.49mmx2.49mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematicLEDEfficiency

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspecifikationer