Texas Instruments LM36272 Handleiding

Bekijk gratis de handleiding van Texas Instruments LM36272 (71 pagina’s), behorend tot de categorie Niet gecategoriseerd. Deze gids werd als nuttig beoordeeld door 2 mensen en kreeg gemiddeld 4.8 sterren uit 4 reviews. Heb je een vraag over Texas Instruments LM36272 of wil je andere gebruikers van dit product iets vragen? Stel een vraag

IN

HWEN

LM36272

SCL

SDA

C+

C-

VNEG

VPOS

LED1

LED2

BL_OUT

LCM_OUT

BL_SW

LCM_SW

PWM

LCM_EN1

LCM_EN2

AGND

LCM_GND

BL_GND

CP_GND

C

FLY

L

BL

V

BATT

Up to 8 LEDs / String

C

BL_OUT

C

LCM

C

VPOS

C

VNEG

L

LCM

DSCH

BL_SW

Copyright © 2017, Texas Instruments Incorporated

Load (mA)

Efficiency (%)

051015202530354045505560

50

55

60

65

70

75

80

85

90

95

D051

V

IN

= 2.7 V

V

IN

= 3.7 V

V

IN

= 5 V

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM36272

SNVSAJ7D–FEBRUARY2016–REVISEDMARCH2018

LM36272Two-ChannelLCDBacklightDriverWithIntegratedBiasPower

1

1Features

1

•DrivesuptoTwoParallelWhiteLEDStrings

(29-VMaximumV

OUT

)

•11-BitExponentialandLinearDimmingControl

•PWMandI

2

CBrightnessControl

•BacklightOperationWith4.7-µHto15-µHInductor

•BacklightandLCDBiasEfficiencyupto92%

•ProgrammableLCDBiasVoltages(±4Vto±6.5V

With50-mVresolution)WithUpto80-mAper

Output

•0.2%MatchedLEDCurrentFrom60µAto30mA

•1%AccurateLEDCurrentFrom60µAto30mA

•2.7-Vto5-VInputVoltageRange

2Applications

•LCDPanelsWithupto16LEDs

•SmartPhones

•TabletsandGamingTablets

•HomeAutomationPanels

space

space

SimplifiedSchematic

3Description

TheLM36272isanintegratedtwo-channelWLED

driverandLCDbiassupply.Theultra-compactsize,

highefficiency,highlevelofintegration,and

programmabilityallowtheLM36272toaddressa

varietyofapplicationswithouttheneedforhardware

changeswhileminimizingtheoverallsolutionarea.

Thebacklightboostprovidesthepowertobiastwo

parallelLEDstringswithupto29-Vtotaloutput

voltage.The11-bitLEDcurrentisprogrammablevia

theI

2

Cbusand/orcontrolledviaalogiclevelPWM

inputfrom60µAto30mA.EachLEDstringcanbe

independentlyenabledordisabledtoprovidezone

dimmingcapabilities.Thebacklightboostcanbe

operatedefficientlywithaninductancerangefrom

4.7µHto15µH,allowingforefficiencyandsolution

sizeoptimization.

TheLCDbiasboostprovidesthepowertobotha

positiveLDOandaninvertingchargepump.Both

positiveandnegativebiassupplieshave

programmableoutputvoltagesof±4Vto±6.5Vwith

50-mVstepsandupto±80mAofcurrentcapability.

Anauto-sequencingfeatureprovidesaprogrammed

delayfrompositivetonegativebiasactivation,with

additionalprogrammablevoltageslewratecontrol.

Twowake-upmodesallowbothbiasoutputstobe

controlledwithasingleexternalsignalandstayactive

whileconsumingverylowquiescentcurrent.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(MAX)

LM36272DSBGA(24)2.44mm×1.67mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

BacklightEfficiency,2P8S

Product specificaties