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LTC3210-3_15 PDF预览

LTC3210-3_15

更新时间: 2024-09-26 01:18:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 283K
描述
MAIN/CAM LED Controllers with 32-Step Brightness Control

LTC3210-3_15 数据手册

 浏览型号LTC3210-3_15的Datasheet PDF文件第2页浏览型号LTC3210-3_15的Datasheet PDF文件第3页浏览型号LTC3210-3_15的Datasheet PDF文件第4页浏览型号LTC3210-3_15的Datasheet PDF文件第5页浏览型号LTC3210-3_15的Datasheet PDF文件第6页浏览型号LTC3210-3_15的Datasheet PDF文件第7页 
LTC3210-2/LTC3210-3  
MAIN/CAM LED Controllers  
with 32-Step Brightness Control  
in 3mm × 3mm QFN  
FeaTures  
DescripTion  
TheꢀLTC®3210-2/LTC3210-3ꢀareꢀlowꢀnoiseꢀchargeꢀpumpꢀ  
DC/DCꢀconvertersꢀdesignedꢀtoꢀdriveꢀthreeꢀorꢀfourꢀMAINꢀ  
LEDsꢀandꢀoneꢀhighꢀcurrentꢀCAMꢀLEDꢀforꢀcameraꢀlighting.ꢀ  
TheLTC3210-2/LTC3210-3requireonlyfoursmallceramicꢀ  
capacitorsandtwocurrentsetresistorstoformacompleteꢀ  
LEDꢀpowerꢀsupplyꢀandꢀcurrentꢀcontroller.  
n
Low Noise Charge Pump Provides High Efficiency  
with Automatic Mode Switching  
n
Multimode Operation: 1x, 1.5x, 2x  
n
Individual Full-Scale Current Set Resistors  
n
Up to 500mA Total Output Current  
Single Wire EN/Brightness Control for MAIN and  
CAM LEDs  
n
Built-inꢀsoft-startꢀcircuitryꢀpreventsꢀexcessiveꢀinrushꢀcur-  
rentꢀduringꢀstart-upꢀandꢀmodeꢀchanges.ꢀHighꢀswitchingꢀ  
frequencyꢀenablesꢀtheꢀuseꢀofꢀsmallꢀexternalꢀcapacitors.ꢀ  
IndependentMAINandCAMfull-scalecurrentsettingsꢀ  
areꢀprogrammedꢀbyꢀtwoꢀexternalꢀresistors.ꢀ  
n
32:1 Linear Brightness Control Range for  
MAIN Display  
n
n
n
n
n
ꢀ ThreeꢀorꢀFourꢀ25mAꢀLowꢀDropoutꢀMAINꢀLEDꢀOutputs  
ꢀ Oneꢀ400mAꢀLowꢀDropoutꢀCAMꢀLEDꢀOutput  
ꢀ LowꢀNoiseꢀConstantꢀFrequencyꢀOperation*  
ꢀ LowꢀShutdownꢀCurrent:ꢀ3µAꢀ  
ꢀ InternalꢀSoft-StartꢀLimitsꢀInrushꢀCurrentꢀDuringꢀ  
StartupꢀandꢀModeꢀSwitching  
Shutdownmodeandcurrentoutputlevelsareselectedꢀ  
viaꢀtwoꢀlogicꢀinputs.ꢀENMꢀandꢀENCꢀareꢀtoggledꢀtoꢀadjustꢀ  
theꢀLEDꢀcurrentsꢀviaꢀinternalꢀcountersꢀandꢀDACs.ꢀAꢀ5-bitꢀ  
linearꢀDACꢀ(32ꢀsteps)ꢀprovidesꢀhighꢀresolutionꢀbrightnessꢀ  
controlꢀforꢀtheꢀMAINꢀdisplay.  
n
n
n
ꢀ Open/ShortꢀLEDꢀProtection  
ꢀ NoꢀInductors  
Theꢀchargeꢀpumpꢀoptimizesꢀefficiencyꢀbasedꢀonꢀtheꢀvolt-  
ageꢀacrossꢀtheꢀLEDꢀcurrentꢀsources.ꢀTheꢀpartꢀpowersꢀupꢀ  
inꢀ1xꢀmodeꢀandꢀwillꢀautomaticallyꢀswitchꢀtoꢀboostꢀmodeꢀ  
wheneverꢀ anyꢀ enabledꢀ LEDꢀ currentꢀ sourceꢀ beginsꢀ toꢀ  
enterꢀdropout.ꢀTheꢀLTC3210-2/LTC3210-3ꢀareꢀavailableꢀ  
inꢀaꢀ3mmꢀ×ꢀ3mmꢀ16-leadꢀQFNꢀpackage.  
ꢀ 3mmꢀ×ꢀ3mmꢀ16-LeadꢀPlasticꢀQFNꢀPackage  
applicaTions  
n
ꢀ Multi-LEDꢀLightꢀSupplyꢀforꢀCellphones/DSCs/PDAs  
L,ꢀLT,LTC,ꢀLTM,ꢀLinearꢀTechnologyꢀandꢀtheꢀLinearꢀlogoꢀareꢀregisteredꢀtrademarksꢀofꢀLinearꢀ  
TechnologyꢀCorporation.ꢀAllꢀotherꢀtrademarksꢀareꢀtheꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.ꢀ  
ProtectedꢀbyꢀU.S.ꢀPatentsꢀincludingꢀ6411531.  
Typical applicaTion  
C2  
2.2µF  
C3  
2.2µF  
4-LED MAIN Display  
Efficiency vs VBAT Voltage  
100  
90  
C1P C1M  
BAT  
C2P  
C2M  
MAIN  
CAM  
80  
70  
60  
50  
40  
30  
V
BAT  
V
CPO  
C1  
2.2µF  
C4  
2.2µF  
LTC3210-2  
MLED1  
MLED2  
MLED3  
MLED4  
CLED  
ENM  
ENC  
ENM  
ENC  
20  
4 LEDs AT 9mA/LED  
(TYP V AT 9mA = 3V, NICHIA NSCW100)  
F
10  
321023 TA01  
T
= 25°C  
A
0
RM  
RC  
GND  
3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4  
30.1k  
1%  
24.3k  
1%  
V
(V)  
BAT  
321023 TA01b  
321023fb  

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