Texas Instruments LM3631 Handleiding

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C

OUT

VOUT

L

SW

V

IN

C

IN

LM3631

VIN

C

IN

C

BST

C

FLY

C

NEG

C

VPOS

C

OREF

SDA

SCL

nRST

BST_SW

BST_OUT

SW

LED1

LED2

C2

CP_VNEG

LDO_OREF

LDO_VPOS

C1

PGND

AGND

V

NEG

(-5.4V)

V

POS

(+5.4V)

V

OREF

(+4.0V to +6.0V)

Up to 8 LEDs / string

PWM

FLAG

OTP_SEL

LDO_CONT

GND_SWGND_BST_SW

L

BST

+

-

LCD_EN

V

CONT

(+1.8V)

C

CONT

D1

Load (mA)

Total Efficiency (%)

05101520253035404550

50

55

60

65

70

75

80

85

90

95

D007

VIN 2.7V

VIN 3.7V

VIN 5.0V

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LM3631

SNVS834–AUGUST2014

LM3631CompleteLCDBacklightandBiasPower

1Features2Applications

MobileDeviceLCDBacklightingandBias

1

•DrivesuptoTwoStringswithMaximumofEight

LEDsinSeries

3Description

–IntegratedBacklightBoostwith29-VMaximum

TheLM3631isacompleteLCDbacklightandbias

OutputVoltage

powersolutionformobiledevices.Thisone-chip

–TwoLow-SideConstant-CurrentLEDDrivers

solutionhasanintegratedhigh-efficiencybacklight

with25-mAMaximumOutputCurrent

LEDdriverandpositive/negativebiassuppliesfor

•BacklightEfficiencyUpto90%

LCDdriversaddressingthepowerrequirementsof

high-definitionLCDs.Integratedsolutionallowssmall

•11-BitLinearorExponentialDimmingwithupto

solutionsizewhilestillmaintaininghighperformance.

17-BitOutputResolution

Capableofdrivingupto16LEDs,theLM3631is

•ExternalPWMInputforCABCBacklight

idealforsmall-tomedium-sizedisplays.Two

Operation

additionalprogrammableLDOregulatoroutputscan

•LCDBiasEfficiency>85%

beusedtopowerdisplaycontroller,LCDgamma

•ProgrammablePositiveLCDbias,4-Vto6-V,

reference,oranyadditionalperipherals.

100-mAMaximumOutputCurrent

Ahighlevelofintegrationandprogrammabilityallows

•ProgrammableNegativeLCDbias,–4-Vto–6-V,

theLM3631toaddressavarietyofapplications

80-mAMaximumOutputCurrent

withouttheneedforhardwarechanges.Voltage

levels,backlightconfiguration,andpowersequences

•TwoPositiveProgrammableLDOReference

areallconfigurablethroughI

2

Cinterface.

Outputs

–4-Vto6-V,50-mAMaximumOutputCurrent

DeviceInformation

(1)

–1.8-Vto3.3-V,80-mAMaximumOutput

PARTNUMBERPACKAGEBODYSIZE(MAX)

Current

LM3631DSBGA(24)2.585mmx1.885mm

•2.7-Vto5-VInputVoltageRange

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematicBacklightEfficiency,2P6S

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties