Texas Instruments LM36922H Handleiding

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V

OUT

(Up to 38V)

IN

SWOVP

LED1

LED2

GND

V

BATT

HWEN

LM36922H

PWM

SDA

SCL

V

IO

ASEL

Product

Folder

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Buy

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM36922H

SNVSAF2A–FEBRUARY2016–REVISEDFEBRUARY2016

LM36922HHighlyEfficientDual-StringWhiteLEDDriver

1

1Features

1

•1%MatchedCurrentSinksAcrossProcess,

Voltage,Temperature

•3%Current-SinkAccuracyAcrossProcess,

Voltage,Temperature

•11-BitDimmingResolution

•Upto90%SolutionEfficiency

•DrivesfromOnetoTwoParallelLEDStringsatup

to38Vat25mAperString

•PWMDimmingInput

•I

2

CProgrammable

•Selectable500-kHzand1-MHzSwitching

FrequencyWithOptional–12%shift

•AutoSwitchFrequencyMode(250kHz,500kHz,

1MHz)

•FourConfigurableOvervoltageProtection

Thresholds(17V,24V,31V,38V)

•FourConfigurableOvercurrentProtection

Thresholds(750mA,1000mA,1250mA,

1500mA)

•ThermalShutdownProtection

•ExternallySelectableI

2

CAddressOptionsvia

ASELInput

2Applications

•PowerSourceforSmartPhoneandTablet

Backlighting

•LCDPanelsWithupto24LEDs

3Description

TheLM36922Hisanultra-compact,highlyefficient,

two-stringwhite-LEDdriverdesignedforLCDdisplay

backlighting.Thedevicecanpowerupto12series

LEDsatupto25mAperstring.Anadaptivecurrent

regulationmethodallowsfordifferentLEDvoltagesin

eachstringwhilemaintainingcurrentregulation.

TheLEDcurrentisadjustedviaanI

2

Cinterfaceor

throughalogiclevelPWMinput.ThePWMdutycycle

isinternallysensedandmappedtoan11-bitcurrent

thusallowingforawiderangeofPWMfrequencies

withnoise-freeoperationfrom50µAto25mA.

Otherfeaturesincludeanauto-frequencymode,

whichcanautomaticallychangethefrequencybased

onloadcurrentinordertooptimizeefficiency.

Thedeviceoperatesoverthe2.5-Vto5.5-Vinput

voltagerangeanda–40°Cto+85°Ctemperature

range.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(MAX)

LM36922HDSBGA(12)1.756mm×1.355mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

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SimplifiedSchematic

TypicalString-to-StringMatchingvsLEDCurrent

Product specificaties