Texas Instruments LM3554 Bedienungsanleitung
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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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Folder
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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
Produktspezifikationen
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LM3554 |
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