Texas Instruments LM3554 Handleiding

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HWEN

SCL

SDA

STROBE

TX1/TORCH/

GPIO1

INOUT

GND

LED1

LED2

LEDI/NTC

SW

4.5-V or 5-V DC Power Rail

Flash

LEDs

Indicator

LED

ENVM/TX2

/GPIO

VBIAS

D1D2

LM3554

0.1 µF

R

BIAS

4.7 µF

4.7 µF

2.2 µH

2 NŸ

Thermistor

2.5 V ± 5.5 V

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM3554

SNVS549C–JUNE2009–REVISEDFEBRUARY2016

LM3554SynchronousBoostConverterWith1.2-ADualHigh-SideLEDDriversandI

2

C-

CompatibleInterface

1

1Features

1

•InputVoltage:2.5Vto5.5V

•Programmable4.5-Vor5-VConstantOutput

Voltage

•DualHigh-SideCurrentSources

•GroundedCathodeAllowingforBetterHeat

SinkingandLEDRouting

•>90%Efficiency

•Ultra-SmallSolutionSize:<23mm

2

•FourOperatingModes:Torch,Flash,LED

Indicator,andVoltageOutput

•AccurateandProgrammableLEDCurrentfrom

37.5mAto1.2A

•HardwareFlashandTorchEnable

•LEDThermalSensingandCurrentScaleback

•SoftwareSelectableInputVoltageMonitor

•ProgrammableFlashTimeout

•DualSynchronizationInputsforRFPower-

AmplifierPulseEvents

•OpenandShortLEDDetection

•ActiveHighHardwareEnableforProtection

AgainstSystemFaults

•400-kHzI

2

C-CompatibleInterface

2Applications

•CameraPhoneLEDFlashController

•ClassDAudioAmplifierPower

•LEDCurrentSourceBiasing

3Description

TheLM3554isa2-MHzfixed-frequency,current-

modesynchronousboostconverter.Thedeviceis

designedtooperateasadual600-mA(1.2Atotal)

constant-currentdriverforhigh-currentwhiteLEDs,or

asaregulated4.5-Vor5-Vvoltagesource.

Themainfeaturesinclude:anI

2

C-compatible

interfaceforcontrollingtheLEDcurrentorthedesired

outputvoltage,ahardwareflashenableinputfor

directtriggeringoftheflashpulse,anddualTXinputs

whichforcetheflashpulseintoalow-currenttorch

modeallowingforsynchronizationtoRFpower

amplifiereventsorotherhigh-currentconditions.

Additionally,anactivehighhardwareenable(HWEN)

inputprovidesahardwareshutdownduringsystem

softwarefailures.

Fiveprotectionfeaturesareavailablewithinthe

LM3554includingasoftwareselectableinputvoltage

monitor,aninternalcomparatorforinterfacingwithan

externaltemperaturesensor,fourselectablecurrent

limitstoensurethebatterycurrentiskeptbelowa

predeterminedpeaklevel,anovervoltageprotection

featuretolimittheoutputvoltageduringLEDopen

circuits,andanoutputshortcircuitprotectionwhich

limitstheoutputcurrentduringshortstoGND.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(MAX)

LM3554DSBGA(16)

1.685mm×1.685

mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplicationCircuit

Product specificaties