LTC3210-2_15 [Linear]
MAIN/CAM LED Controllers with 32-Step Brightness Control;
| 型号： | LTC3210-2_15 |
| 厂家： | 
Linear |
| 描述： | MAIN/CAM LED Controllers with 32-Step Brightness Control |
| 文件： | 总16页 (文件大小：283K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.ꢀ
TheꢀLTC3210-2/LTC3210-3ꢀrequireꢀonlyꢀfourꢀsmallꢀceramicꢀ
capacitorsꢀandꢀtwoꢀcurrentꢀsetꢀresistorsꢀtoꢀformꢀaꢀcompleteꢀ
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.ꢀ
IndependentꢀMAINꢀandꢀCAMꢀfull-scaleꢀcurrentꢀsettingsꢀ
areꢀprogrammedꢀbyꢀtwoꢀexternalꢀresistors.ꢀ
n
ꢀ 32:1 Linear Brightness Control Range for
MAIN Display
n
n
n
n
n
ꢀ ThreeꢀorꢀFourꢀ25mAꢀLowꢀDropoutꢀMAINꢀLEDꢀOutputs
ꢀ Oneꢀ400mAꢀLowꢀDropoutꢀCAMꢀLEDꢀOutput
ꢀ LowꢀNoiseꢀConstantꢀFrequencyꢀOperation*
ꢀ LowꢀShutdownꢀCurrent:ꢀ3µAꢀ
ꢀ InternalꢀSoft-StartꢀLimitsꢀInrushꢀCurrentꢀDuringꢀ
StartupꢀandꢀModeꢀSwitching
Shutdownꢀmodeꢀandꢀcurrentꢀoutputꢀlevelsꢀareꢀselectedꢀ
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
ꢀ
CPOꢀShort-CircuitꢀDuration.............................. Indefinite
LTC3210-2/LTC3210-3
absoluTe MaxiMuM raTings(Note 1)
V
,ꢀCPOꢀtoꢀGNDꢀ........................................–0.3Vꢀtoꢀ6V
I
ꢀ(Noteꢀ2)...................................................... 500mA
BAT
CLED
ENM,ꢀENCꢀ...................................–0.3Vꢀtoꢀ(V ꢀ+ꢀ0.3V)
BAT
I
I
ꢀ(Noteꢀ2)ꢀ....................................................... 600mA
OperatingꢀTemperatureꢀRangeꢀ(Noteꢀ3)ꢀ...–40°Cꢀtoꢀ85°C
StorageꢀTemperatureꢀRangeꢀ..................–65°Cꢀtoꢀ125°C
CPO
ꢀ.................................................................35mA
MLED1-4
pin conFiguraTion
TOP VIEW
TOP VIEW
16 15 14 13
16 15 14 13
C1P
CPO
1
2
3
4
12 GND
11 CLED
C1P
CPO
1
2
3
4
12 GND
11 CLED
17
17
ENM
ENC
RC
ENM
ENC
RC
10
9
10
9
MLED1
MLED1
5
6
7
8
5
6
7
8
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
ꢀ=ꢀ125°C,ꢀθ ꢀ=ꢀ68°C/Wꢀ
ꢀ
ꢀ
T
JMAX
ꢀ=ꢀ125°C,ꢀθ ꢀ=ꢀ68°C/Wꢀ
T
JMAX
JA
JA
EXPOSEDꢀPADꢀ(PINꢀ17)ꢀISꢀGND,ꢀMUSTꢀBEꢀSOLDEREDꢀTOꢀPCB
EXPOSEDꢀPADꢀ(PINꢀ17)ꢀISꢀGND,ꢀMUSTꢀBEꢀSOLDEREDꢀTOꢀPCB
orDer inForMaTion
LEAD FREE FINISH
LTC3210EUD-2#PBF
LTC3210EUD-3#PBF
TAPE AND REEL
PART MARKING
LCHX
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3210EUD-2#TRPBF
LTC3210EUD-3#TRPBF
–40°Cꢀtoꢀ85°C
–40°Cꢀtoꢀ85°C
16-Leadꢀ(3mmꢀ×ꢀ3mm)ꢀPlasticꢀQFN
16-Leadꢀ(3mmꢀ×ꢀ3mm)ꢀPlasticꢀQFN
LCHY
ConsultꢀLTCꢀMarketingꢀforꢀpartsꢀspecifiedꢀwithꢀwiderꢀoperatingꢀtemperatureꢀranges.ꢀ
ConsultꢀLTCꢀMarketingꢀforꢀinformationꢀonꢀnon-standardꢀleadꢀbasedꢀfinishꢀparts.
Forꢀmoreꢀinformationꢀonꢀleadꢀfreeꢀpartꢀmarking,ꢀgoꢀto:ꢀhttp://www.linear.com/leadfree/ꢀꢀ
Forꢀmoreꢀinformationꢀonꢀtapeꢀandꢀreelꢀspecifications,ꢀgoꢀto:ꢀhttp://www.linear.com/tapeandreel/
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.VBAT = 3.6V, C1 = C2 = C3 = C4 = 2.2µF, RM = 30.1k, RC = 24.3k,
ENM = high, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
V
BAT
ꢀOperatingꢀVoltage
2.9
4.5
V
I
ꢀOperatingꢀCurrent
I
I
I
ꢀ=ꢀ0,ꢀ1xꢀMode,ꢀLSBꢀSettingꢀ
ꢀ=ꢀ0,ꢀ1.5xꢀModeꢀ
0.4ꢀ
2.5ꢀ
4.5
mAꢀ
mAꢀ
mA
VBAT
CPO
CPO
CPO
ꢀ=ꢀ0,ꢀ2xꢀMode
l
V
ꢀShutdownꢀCurrent
ENMꢀ=ꢀENCꢀ=ꢀLow
3
6
µA
BAT
MLED1, MLED2, MLED3 and MLED4 (LTC3210-2 Only) Current
LEDꢀCurrentꢀRatioꢀ(I /I
l
)
I ꢀ=ꢀFullꢀScale
MLED
481
525
75
589
A/A
mV
%
MLED RM
LEDꢀDropoutꢀVoltage
LEDꢀCurrentꢀMatching
ModeꢀSwitchꢀThreshold,ꢀI
AnyꢀTwoꢀOutputs
ꢀ=ꢀFullꢀScale
MLED
0.5
321023fb
ꢁ
LTC3210-2/LTC3210-3
The l denotes the specifications which apply over the full operating
elecTrical characTerisTics
temperature range, otherwise specifications are at TA = 25°C.VBAT = 3.6V, C1 = C2 = C3 = C4 = 2.2µF, RM = 30.1k, RC = 24.3k,
ENM = high, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MLEDꢀCurrent,ꢀ5-BitꢀLinearꢀDAC
1ꢀENMꢀStrobeꢀ(FS)ꢀ
31ꢀENMꢀStrobesꢀ(FS/31)
20ꢀ
ꢀ0.640
mAꢀ
mA
CLED Current
l
LEDꢀCurrentꢀRatioꢀ(I
/I
)
I
ꢀ=ꢀFullꢀScale
6930
7700
500
8470
A/A
mV
CLED RC
CLED
LEDꢀDropoutꢀVoltageꢀ
ModeꢀSwitchꢀThreshold,ꢀI
ꢀ=ꢀFullꢀScale
CLED
CLEDꢀCurrent,ꢀ3-BitꢀLinearꢀDAC
1ꢀENCꢀStrobeꢀ(FS)ꢀ
7ꢀENCꢀStrobesꢀ(FS/7)
380ꢀ
54
mAꢀ
mA
Charge Pump (CPO)
1xꢀModeꢀOutputꢀVoltage
1.5xꢀModeꢀOutputꢀVoltage
2xꢀModeꢀOutputꢀVoltage
1xꢀModeꢀOutputꢀImpedance
1.5xꢀModeꢀOutputꢀImpedance
2xꢀModeꢀOutputꢀImpedance
CLOCKꢀFrequency
I
I
I
ꢀ=ꢀ0mA
ꢀ=ꢀ0mA
ꢀ=ꢀ0mA
V
V
V
CPO
CPO
CPO
BAT
4.55
5.05
0.55
3.15
3.95
0.8
V
Ω
V
V
ꢀ=ꢀ3.4V,ꢀV ꢀ=ꢀ4.6Vꢀ(Noteꢀ4)
Ω
BAT
CPO
ꢀ=ꢀ3.2V,ꢀV ꢀ=ꢀ5.1Vꢀ(Noteꢀ4)
Ω
BAT
CPO
ꢀ
ꢀ
MHz
ms
ModeꢀSwitchingꢀDelay
CPO Short Circuit Detection
ThresholdꢀVoltage
0.4
l
l
0.4
10
1.3
30
V
TestꢀCurrent
CPOꢀ=ꢀ0V,ꢀENMꢀ=ꢀENCꢀ=ꢀLow
mA
ENC, ENM
l
l
l
l
V
0.4
V
V
IL
V ꢀ
1.4
10
–1
IH
I
I
ENMꢀ=ꢀENCꢀ=ꢀ3.6V
ENMꢀ=ꢀENCꢀ=ꢀ0V
15
20
1
µA
µA
IH
IL
ENC, ENM Timing
l
l
t
t
t
MinimumꢀPulseꢀWidth
200
50
ns
µs
PW
SD
EN
LowꢀTimeꢀtoꢀShutdownꢀ(ENC,ꢀENMꢀ=ꢀLow)
150
250
CurrentꢀSourceꢀEnableꢀTimeꢀ
(ENC,ꢀENMꢀ=ꢀHigh)ꢀ(Noteꢀ5)
ꢀ
50
ꢀ
ꢀ
ꢀ
µs
l
150
250
RM, RC
,ꢀV
l
l
V
ꢀ
1.16
1.20
1.24
80
V
RM RC
I
,ꢀI
RM RC
µA
Note 1:ꢀStressesꢀbeyondꢀthoseꢀlistedꢀunderꢀAbsoluteꢀMaximumꢀRatingsꢀ
mayꢀcauseꢀpermanentꢀdamageꢀtoꢀtheꢀdevice.ꢀExposureꢀtoꢀanyꢀAbsoluteꢀ
MaximumꢀRatingꢀconditionꢀforꢀextendedꢀperiodsꢀmayꢀaffectꢀdeviceꢀ
reliabilityꢀandꢀlifetime.
Note 3:ꢀTheꢀLTC3210E-2/LTC3210E-3ꢀareꢀguaranteedꢀtoꢀmeetꢀperformanceꢀ
specificationsꢀfromꢀ0°Cꢀtoꢀ85°C.ꢀSpecificationsꢀoverꢀtheꢀ–40°Cꢀtoꢀ85°Cꢀ
operatingꢀtemperatureꢀrangeꢀareꢀassuredꢀbyꢀdesign,ꢀcharacterizationꢀandꢀ
correlationꢀwithꢀstatisticalꢀprocessꢀcontrols.ꢀ
Note 2:ꢀBasedꢀonꢀlong-termꢀcurrentꢀdensityꢀlimitations.ꢀAssumesꢀanꢀ
operatingꢀdutyꢀcycleꢀofꢀ≤10%ꢀunderꢀabsoluteꢀmaximumꢀconditionsꢀ
forꢀdurationsꢀlessꢀthanꢀ10ꢀseconds.ꢀMaximumꢀcurrentꢀforꢀcontinuousꢀ
operationꢀisꢀ300mA.
Note 4:ꢀ1.5xꢀmodeꢀoutputꢀimpedanceꢀisꢀdefinedꢀasꢀ(1.5V ꢀ–ꢀV )/I .ꢀ
BAT CPO OUT
2xꢀmodeꢀoutputꢀimpedanceꢀisꢀdefinedꢀasꢀ(2V ꢀ–ꢀV )/I
.
BAT
CPO OUT
Note 5:ꢀIfꢀtheꢀpartꢀhasꢀbeenꢀshutꢀdownꢀthenꢀtheꢀinitialꢀenableꢀtimeꢀisꢀaboutꢀ
100µsꢀlongerꢀdueꢀtoꢀtheꢀbandgapꢀenableꢀtime.
321023fb
ꢂ
LTC3210-2/LTC3210-3
Typical perForMance characTerisTics TA = 25°C unless otherwise stated.
Dropout Time from Shutdown
Dropout Time When Enabled
1.5x CPO Ripple
V
CPO
C
= 3.6V
= 200mA
= 2.2µF
BAT
I
5.1V
2X
5.1V
2X
CPO
1V/DIV
CPO
1V/DIV
CPO
1.5X
1.5X
1X
1X
V
CPO
EN
2V/DIV
ENC
2V/DIV
50mV/DIV
AC-COUPLED
MODE
RESET
MODE
RESET
ENM = HIGH
250µs/DIV
321023 G01
321023 G02
321023 G03
500µs/DIV
500ns/DIV
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5VBAT – VCPO)/ICPO
1x Mode Switch Resistance
vs Temperature
2x CPO Ripple
0.70
0.65
3.8
3.6
I
= 200mA
V
V
= 3V
= 4.2V
CPO
V
= 3.6V
= 200mA
= 2.2µF
BAT
CPO
BAT
I
CPO
CPO
C
C2 = C3 = C4 = 2.2µF
3.4
3.2
3.0
2.8
2.6
2.4
V
0.60
0.55
CPO
20mV/DIV
V
= 3.3V
BAT
AC-COUPLED
V
= 3.6V
BAT
0.50
0.45
0.40
V
= 3.9V
10
BAT
321023 G04
500ns/DIV
–40
–15
35
60
85
–15
10
35
85
–40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
321023 G05
321023 G06
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2VBAT – VCPO)/ICPO
2x Mode CPO Voltage
vs Load Current
1.5x Mode CPO Voltage
vs Load Current
4.8
4.6
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.6
C2 = C3 = C4 = 2.2µF
C2 = C3 = C4 = 2.2µF
V
V
= 3V
BAT
CPO
= 4.8V
4.4
V
= 3.3V
C2 = C3 = C4 = 2.2µF
BAT
V
BAT
= 3.6V
V
= 3.4V
BAT
4.2
4.0
3.8
3.6
3.4
3.2
V
= 3.5V
4.4
4.2
BAT
V
= 3.5V
BAT
V
= 3.6V
BAT
V
= 3.4V
BAT
V
BAT
= 3.3V
4.0
3.8
3.6
V
V
= 3.2V
BAT
V
= 3.2V
BAT
= 3.1V
V
V
= 3.1V
BAT
BAT
= 3V
200
V
BAT
= 3V
400
BAT
0
100
300
400
500
0
100
200
300
500
–15
10
35
85
–40
60
LOAD CURRENT (mA)
LOAD CURRENT (mA)
TEMPERATURE (°C)
321023 G07
321023 G09
321023 G08
321023fb
ꢃ
LTC3210-2/LTC3210-3
Typical perForMance characTerisTics TA = 25°C unless otherwise stated.
CLED Pin Dropout Voltage
vs CLED Pin Current
MLED Pin Dropout Voltage
vs MLED Pin Current
Oscillator Frequency
vs VBAT Voltage
500
400
300
200
100
0
120
100
80
60
40
20
0
850
840
830
820
810
800
790
780
770
V
= 3.6V
BAT
V
= 3.6V
BAT
T
= 25°C
A
T
= 85°C
A
T
= –40°C
A
760
0
2
4
6
8
10 12 14 16 18 20
50 100 150 200 250 300 350 400
2.7
3.0
3.3
3.6
VOLTAGE (V)
4.5
3.9
4.2
CLED PIN CURRENT (mA)
MLED PIN CURRENT (mA)
V
BAT
321023 G10
321023 G11
321023 G12
V
BAT Shutdown Current
1x Mode No Load VBAT Current
vs VBAT Voltage
1.5x Mode Supply Current
vs ICPO (IVBAT – 1.5ICPO
vs VBAT Voltage
)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
20
15
10
5
800
780
760
740
720
700
680
660
640
620
600
V
= 3.6V
BAT
RM = 33.2k
RC = 24.3k
T
= 25°C
A
T
= –40°C
A
T
= 85°C
3.3
A
0
3.9
VOLTAGE (V)
4.5
2.7
3.0
3.6
4.2
0
100
200
300
400
500
2.7
3.0
3.6
3.9
4.2
4.5
3.3
V
V
VOLTAGE (V)
LOAD CURRENT (mA)
BAT
BAT
321023 G13
321023 G14
321023 G15
2x Mode Supply Current
CLED Pin Current
vs CLED Pin Voltage
vs ICPO (IVBAT – 2ICPO
)
20
400
360
320
280
240
200
160
120
80
V
= 3.6V
V
= 3.6V
BAT
BAT
15
10
5
40
0
0
0
100
200
300
400
500
0
0.2
0.4
0.6
0.8
1
LOAD CURRENT (mA)
CLED PIN VOLTAGE (V)
321023 G16
321023 G17
321023fb
ꢄ
LTC3210-2/LTC3210-3
Typical perForMance characTerisTics TA = 25°C unless otherwise stated.
MLED Pin Current
vs MLED Pin Voltage
CLED Current
vs ENC Strobe Pulses
22
20
18
16
14
12
10
8
400
350
300
250
200
150
100
50
V
= 3.6V
V
= 3.6V
BAT
BAT
RC = 24.3k
6
4
2
0
0.00
0
0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
0.02
0
6
5
4
3
2
1
7
MLED PIN VOLTAGE (V)
NUMBER OF ENC STROBE PULSES
321023 G18
321023 G19
MLED Current
vs ENM Strobe Pulses
Efficiency vs VBAT Voltage
21
18
90
80
70
60
50
40
30
20
10
0
V
= 3.6V
BAT
RM = 30.1k
15
12
9
6
3
300mA LED CURRENT
(TYP V AT 300mA = 3.1V, AOT-2015HPW
F
0
28 24 20 16 12
NUMBER OF ENM STROBE PULSES
0
8
4
1
2.9 3.05 3.2 3.35 3.5 3.65
4.4
3.8 3.95 4.1 4.25
V
(V)
BAT
321023 G21
321023 G20
321023fb
ꢅ
LTC3210-2/LTC3210-3
pin FuncTions
C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13):ꢀChargeꢀPumpꢀ MLED4 (Pin 7, LTC3210-2 Only):ꢀOutput.ꢀMLED4ꢀisꢀtheꢀ
FlyingꢀCapacitorꢀPins.ꢀAꢀ2.2µFꢀX7RꢀorꢀX5Rꢀceramicꢀca-
pacitorꢀshouldꢀbeꢀconnectedꢀfromꢀC1PꢀtoꢀC1MꢀandꢀC2Pꢀ
toꢀC2M.
fourthꢀmainꢀcurrentꢀsourceꢀoutputꢀavailableꢀonlyꢀonꢀtheꢀ
LTC3210-2ꢀproduct.ꢀTheꢀLEDꢀisꢀconnectedꢀbetweenꢀCPOꢀ
(anode)ꢀandꢀMLED4ꢀ(cathode).ꢀTheꢀcurrentꢀtoꢀMLED4ꢀ
isꢀsetꢀviaꢀtheꢀENMꢀinputꢀandꢀtheꢀprogrammingꢀresistorꢀ
connectedꢀbetweenꢀRMꢀandꢀGND.ꢀMLED4ꢀtracksꢀtheꢀLEDꢀ
currentsꢀofꢀMLED1-3.
CPO (Pin 2):ꢀOutputꢀofꢀtheꢀChargeꢀPumpꢀUsedꢀtoꢀPowerꢀ
AllꢀLEDs.ꢀThisꢀpinꢀisꢀenabledꢀorꢀdisabledꢀusingꢀtheꢀENMꢀ
andꢀENCꢀinputs.ꢀAꢀ2.2µFꢀX5RꢀorꢀX7Rꢀceramicꢀcapacitorꢀ
shouldꢀbeꢀconnectedꢀtoꢀground.
NC (Pin 7, LTC3210-3 Only):ꢀThisꢀpinꢀisꢀnotꢀconnectedꢀ
andꢀcanꢀbeꢀleftꢀfloatingꢀorꢀconnectedꢀtoꢀground.
ENM, ENC (Pins 3, 10): Inputs.ꢀTheꢀENMꢀandꢀENCꢀpinsꢀ
areꢀusedꢀtoꢀprogramꢀtheꢀLEDꢀoutputꢀcurrents.ꢀTheꢀENCꢀ
pinꢀisꢀstrobedꢀupꢀtoꢀ7ꢀtimesꢀtoꢀdecrementꢀtheꢀinternalꢀ3-bitꢀ
DAC’sꢀfromꢀfull-scaleꢀtoꢀ1LSB.ꢀTheꢀENMꢀpinꢀisꢀstrobedꢀ31ꢀ
timesꢀtoꢀdecrementꢀtheꢀ5-bitꢀDACꢀfromꢀfull-scaleꢀtoꢀ1LSB.
Theꢀcountersꢀwillꢀstopꢀatꢀ1LSBꢀifꢀtheꢀstrobingꢀcontinues.ꢀ
Theꢀpinꢀmustꢀbeꢀheldꢀhighꢀafterꢀtheꢀfinalꢀdesiredꢀpositiveꢀ
strobeꢀedgeꢀandꢀtheꢀdataꢀisꢀtransferredꢀafterꢀaꢀ150µsꢀ(typ)ꢀ
delay.ꢀHoldingꢀtheꢀENMꢀorꢀENCꢀpinꢀlowꢀwillꢀclearꢀtheꢀcoun-
terꢀforꢀtheꢀselectedꢀdisplayꢀandꢀresetꢀtheꢀLEDꢀcurrentꢀtoꢀ
0.ꢀIfꢀbothꢀinputsꢀareꢀheldꢀlowꢀforꢀlongerꢀthanꢀ150µsꢀ(typ)ꢀ
theꢀpartꢀwillꢀgoꢀintoꢀshutdown.ꢀTheꢀchargeꢀpumpꢀmodeꢀ
isꢀresetꢀtoꢀ1xꢀwheneverꢀENCꢀgoesꢀlowꢀorꢀwhenꢀtheꢀpartꢀ
isꢀshutꢀdown.
RM, RC (Pins 8,9):ꢀLEDꢀCurrentꢀProgrammingꢀResistorꢀ
Pins.ꢀTheꢀRMꢀandꢀRCꢀpinsꢀwillꢀservoꢀtoꢀ1.22V.ꢀResistorsꢀ
connectedꢀbetweenꢀeachꢀofꢀtheseꢀpinsꢀandꢀGNDꢀareꢀusedꢀ
toꢀsetꢀtheꢀhighꢀandꢀlowꢀLEDꢀcurrentꢀlevels.ꢀConnectingꢀaꢀ
resistorꢀ15kꢀorꢀlessꢀwillꢀcauseꢀtheꢀLTC3210-2/LTC3210-3ꢀ
toꢀenterꢀovercurrentꢀshutdown.
CLED (Pin 11):ꢀOutput.ꢀCLEDꢀisꢀtheꢀCAMꢀcurrentꢀsourceꢀ
output.ꢀTheꢀLEDꢀisꢀconnectedꢀbetweenꢀCPOꢀ(anode)ꢀandꢀ
CLEDꢀ(cathode).ꢀTheꢀcurrentꢀtoꢀtheꢀLEDꢀoutputꢀisꢀsetꢀviaꢀ
theꢀENCꢀinput,ꢀandꢀtheꢀprogrammingꢀresistorꢀconnectedꢀ
betweenꢀRCꢀandꢀGND.ꢀ
GND (Pin 12):ꢀGround.ꢀThisꢀpinꢀshouldꢀbeꢀconnectedꢀtoꢀ
aꢀlowꢀimpedanceꢀgroundꢀplane.
MLED1, MLED2, MLED3 (Pins 4, 5, 6):ꢀOutputs.ꢀMLED1ꢀ
toꢀMLED3ꢀareꢀtheꢀMAINꢀcurrentꢀsourceꢀoutputs.ꢀTheꢀLEDsꢀ
areꢀconnectedꢀbetweenꢀCPOꢀ(anodes)ꢀandꢀMLED1-3ꢀ(cath-
odes).ꢀTheꢀcurrentꢀtoꢀeachꢀLEDꢀoutputꢀisꢀsetꢀviaꢀtheꢀENMꢀ
input,ꢀandꢀtheꢀprogrammingꢀresistorꢀconnectedꢀbetweenꢀ
RMꢀandꢀGND.
V
(Pin15):ꢀSupplyꢀvoltage.ꢀThisꢀpinꢀshouldꢀbeꢀbypassedꢀ
BAT
withꢀaꢀ2.2µF,ꢀorꢀgreaterꢀlowꢀESRꢀceramicꢀcapacitor.
Exposed Pad (Pin 17):ꢀThisꢀpadꢀshouldꢀbeꢀconnectedꢀ
directlyꢀ toꢀ aꢀ lowꢀ impedanceꢀ groundꢀ planeꢀ forꢀ optimalꢀ
thermalꢀandꢀelectricalꢀperformance.
321023fb
ꢆ
LTC3210-2/LTC3210-3
block DiagraM
C1P
1
C1M
14
C2P
16
C2M
13
800kHz
OSCILLATOR
12 GND
15
V
2
CPO
BAT
CHARGE PUMP
–
+
ENABLE CP
+
–
1.215V
4
5
6
7
MLED1
MLED2
MLED3
TIMER
ENABLE MAIN
500Ω
8
3
RM
5-BIT
DOWN
COUNTER
5-BIT
LINEAR
DAC
MLED
CURRENT
SOURCES
4
ENM
50ns FILTER
250k
MLED4
(LTC3210-2 ONLY)
+
–
1.215V
TIMER
TIMER
SHUTDOWN
ENABLE CAM
3-BIT
500Ω
RC
9
3-BIT
DOWN
COUNTER
CLED
CURRENT
SOURCE
10
11 CLED
50ns FILTER
LINEAR
DAC
ENC
250k
321023 BD
321023fb
ꢇ
LTC3210-2/LTC3210-3
operaTion
Power Management
counterꢀ whichꢀ controlsꢀ aꢀ 5-bitꢀ linearꢀ DAC.ꢀ Whenꢀ theꢀ
desiredꢀcurrentꢀisꢀachievedꢀENMꢀisꢀstoppedꢀhigh.ꢀTheꢀ
outputꢀcurrentꢀthenꢀchangesꢀtoꢀtheꢀprogrammedꢀvalueꢀ
afterꢀ150µsꢀ(typ).ꢀTheꢀcounterꢀwillꢀstopꢀwhenꢀtheꢀLSBꢀ
isꢀreached.ꢀTheꢀoutputꢀcurrentꢀisꢀsetꢀtoꢀ0ꢀwhenꢀENMꢀisꢀ
toggledꢀlowꢀafterꢀtheꢀoutputꢀhasꢀbeenꢀenabled.ꢀIfꢀstrobingꢀ
isꢀstartedꢀwithinꢀ150µsꢀ(typ),ꢀafterꢀENMꢀhasꢀbeenꢀsetꢀlow,ꢀ
theꢀcounterꢀwillꢀcontinueꢀtoꢀcountꢀdown.ꢀAfterꢀ150µsꢀ(typ)ꢀ
theꢀcounterꢀisꢀreset.
Theꢀ LTC3210-2/LTC3210-3ꢀ usesꢀ aꢀ switchedꢀ capacitorꢀ
chargeꢀpumpꢀtoꢀboostꢀCPOꢀtoꢀasꢀmuchꢀasꢀ2ꢀtimesꢀtheꢀ
inputꢀvoltageꢀupꢀtoꢀ5.1V.ꢀTheꢀpartꢀstartsꢀupꢀinꢀ1xꢀmode.ꢀInꢀ
thisꢀmode,ꢀV ꢀisꢀconnectedꢀdirectlyꢀtoꢀCPO.ꢀThisꢀmodeꢀ
BAT
providesꢀmaximumꢀefficiencyꢀandꢀminimumꢀnoise.ꢀTheꢀ
LTC3210-2/LTC3210-3ꢀwillꢀremainꢀinꢀ1xꢀmodeꢀuntilꢀanꢀLEDꢀ
currentꢀsourceꢀdropsꢀout.ꢀDropoutꢀoccursꢀwhenꢀaꢀcurrentꢀ
sourceꢀ voltageꢀ becomesꢀ tooꢀ lowꢀ forꢀ theꢀ programmedꢀ
currentꢀtoꢀbeꢀsupplied.ꢀWhenꢀdropoutꢀisꢀdetected,ꢀtheꢀ TheꢀCLEDꢀcurrentꢀisꢀdeliveredꢀbyꢀaꢀprogrammableꢀcurrentꢀ
LTC3210-2/LTC3210-3ꢀwillꢀswitchꢀintoꢀ1.5xꢀmode.ꢀTheꢀ source.ꢀEightꢀlinearꢀcurrentꢀsettingsꢀ(0mAꢀtoꢀ380mA,ꢀRCꢀ
CPOꢀvoltageꢀwillꢀthenꢀstartꢀtoꢀincreaseꢀandꢀwillꢀattemptꢀ =ꢀ24.3k)ꢀareꢀavailableꢀbyꢀstrobingꢀtheꢀENCꢀpin.ꢀEachꢀposi-
toꢀreachꢀ1.5xꢀV ꢀupꢀtoꢀ4.6V.ꢀAnyꢀsubsequentꢀdropoutꢀ tiveꢀstrobeꢀedgeꢀdecrementsꢀaꢀ3-bitꢀdownꢀcounterꢀwhichꢀ
BAT
willꢀcauseꢀtheꢀpartꢀtoꢀenterꢀtheꢀ2xꢀmode.ꢀTheꢀCPOꢀvoltageꢀ controlsꢀaꢀ3-bitꢀlinearꢀDAC.ꢀWhenꢀtheꢀdesiredꢀcurrentꢀisꢀ
willꢀattemptꢀtoꢀreachꢀ2xꢀV ꢀupꢀtoꢀ5.1V.ꢀTheꢀpartꢀwillꢀbeꢀ reached,ꢀENCꢀisꢀstoppedꢀhigh.ꢀTheꢀoutputꢀcurrentꢀthenꢀ
BAT
resetꢀtoꢀ1xꢀmodeꢀwheneverꢀtheꢀpartꢀisꢀshutꢀdownꢀorꢀwhenꢀ changesꢀtoꢀtheꢀprogrammedꢀvalueꢀafterꢀ150µsꢀ(typ).ꢀTheꢀ
ENCꢀgoesꢀlow.
counterꢀwillꢀstopꢀwhenꢀtheꢀLSBꢀisꢀreached.ꢀTheꢀoutputꢀ
currentꢀisꢀsetꢀtoꢀ0ꢀwhenꢀENCꢀisꢀtoggledꢀlowꢀafterꢀtheꢀoutputꢀ
hasꢀbeenꢀenabled.ꢀIfꢀstrobingꢀisꢀstartedꢀwithinꢀ150µsꢀ(typ)ꢀ
afterꢀENCꢀhasꢀbeenꢀsetꢀlow,ꢀtheꢀcounterꢀwillꢀcontinueꢀtoꢀ
countꢀdown.ꢀAfterꢀ150µsꢀ(typ)ꢀtheꢀcounterꢀisꢀreset.
Aꢀtwoꢀphaseꢀnonoverlappingꢀclockꢀactivatesꢀtheꢀchargeꢀ
pumpꢀswitches.ꢀInꢀtheꢀ2xꢀmodeꢀtheꢀflyingꢀcapacitorsꢀareꢀ
chargedꢀonꢀalternateꢀclockꢀphasesꢀfromꢀV ꢀtoꢀminimizeꢀ
inputꢀcurrentꢀrippleꢀandꢀCPOꢀvoltageꢀripple.ꢀInꢀ1.5xꢀmodeꢀtheꢀ
flyingꢀcapacitorsꢀareꢀchargedꢀinꢀseriesꢀduringꢀtheꢀfirstꢀclockꢀ Theꢀfull-scaleꢀoutputꢀcurrentꢀisꢀcalculatedꢀasꢀfollows:
phaseꢀandꢀstackedꢀinꢀparallelꢀonꢀV ꢀduringꢀtheꢀsecondꢀ
phase.ꢀThisꢀsequenceꢀofꢀchargingꢀandꢀdischargingꢀtheꢀflyingꢀ
capacitorsꢀcontinuesꢀatꢀaꢀconstantꢀfrequencyꢀofꢀ800kHz.
BAT
BAT
ꢀ MLEDꢀfull-scaleꢀoutputꢀcurrentꢀꢀ
ꢀ =ꢀ(1.215V/(RMꢀ+ꢀ500))ꢀ•ꢀ525
ꢀ CLEDꢀfull-scaleꢀoutputꢀcurrentꢀꢀ
ꢀ =ꢀ(1.215V/(RCꢀ+ꢀ500))ꢀ•ꢀ7700
LED Current Control
TheꢀMLEDꢀcurrentsꢀareꢀdeliveredꢀbyꢀtheꢀfourꢀprogram-
mableꢀcurrentꢀsources.ꢀ32ꢀlinearꢀcurrentꢀsettingsꢀ(0mAꢀ
toꢀ20mA,ꢀRMꢀ=ꢀ30.1k)ꢀareꢀavailableꢀbyꢀstrobingꢀtheꢀENMꢀ
pin.ꢀEachꢀpositiveꢀstrobeꢀedgeꢀdecrementsꢀaꢀ5-bitꢀdownꢀ
WhenꢀbothꢀENMꢀandꢀENCꢀareꢀheldꢀlowꢀforꢀmoreꢀthanꢀ
150µsꢀ(typ)ꢀtheꢀpartꢀwillꢀgoꢀintoꢀshutdown.ꢀSeeꢀFigureꢀ1ꢀ
forꢀtimingꢀinformation.
ENCꢀresetsꢀtheꢀmodeꢀtoꢀ1xꢀonꢀaꢀfallingꢀedge.
t
≥
t
t
SD 150µs (TYP)
PW 200ns
EN 150µs (TYP)
ENM
OR ENC
PROGRAMMED
CURRENT
LED
CURRENT
ENM = ENC = LOW
SHUTDOWN
321023 F01
Figure 1. Current Programming Timing Diagram
321023fb
ꢈ
LTC3210-2/LTC3210-3
draw
a
veryꢀlow
current
from
the
BAT
V
ꢀ
LTC3210-2/LTC3210-3
operaTion
Soft-Start
mode.ꢀConsiderꢀtheꢀexampleꢀofꢀdrivingꢀwhiteꢀLEDsꢀfromꢀ
aꢀ3.1Vꢀsupply.ꢀIfꢀtheꢀLEDꢀforwardꢀvoltageꢀisꢀ3.8Vꢀandꢀtheꢀ
currentꢀsourcesꢀrequireꢀ100mV,ꢀtheꢀadvantageꢀvoltageꢀforꢀ
1.5xꢀmodeꢀisꢀ3.1Vꢀ•ꢀ1.5ꢀ–ꢀ3.8Vꢀ–ꢀ0.1Vꢀorꢀ750mV.ꢀNoticeꢀ
thatꢀifꢀtheꢀinputꢀvoltageꢀisꢀraisedꢀtoꢀ3.2V,ꢀtheꢀadvantageꢀ
voltageꢀjumpsꢀtoꢀ900mV—aꢀ20%ꢀimprovementꢀinꢀavail-
ableꢀstrength.
Initially,ꢀwhenꢀtheꢀpartꢀisꢀinꢀshutdown,ꢀaꢀweakꢀswitchꢀcon-
nectsꢀV ꢀtoꢀCPO.ꢀThisꢀallowsꢀV ꢀtoꢀslowlyꢀchargeꢀtheꢀ
BAT
BAT
CPOꢀoutputꢀcapacitorꢀtoꢀpreventꢀlargeꢀchargingꢀcurrents.
TheꢀLTC3210-2/LTC3210-3ꢀalsoꢀemployꢀaꢀsoft-startꢀfeatureꢀ
onꢀitsꢀchargeꢀpumpꢀtoꢀpreventꢀexcessiveꢀinrushꢀcurrentꢀ
andꢀsupplyꢀdroopꢀwhenꢀswitchingꢀintoꢀtheꢀstep-upꢀmodes.ꢀ
TheꢀcurrentꢀavailableꢀtoꢀtheꢀCPOꢀpinꢀisꢀincreasedꢀlinearlyꢀ
overꢀaꢀtypicalꢀperiodꢀofꢀ150µs.ꢀSoft-startꢀoccursꢀatꢀtheꢀ
startꢀofꢀbothꢀ1.5xꢀandꢀ2xꢀmodeꢀchanges.
Fromꢀ Figureꢀ 2,ꢀ forꢀ 1.5xꢀ modeꢀ theꢀ availableꢀ currentꢀ isꢀ
givenꢀby:
(1.5VBAT – VCPO
ROL
)
IOUT
=
ꢀ
Charge Pump Strength and Regulation
Forꢀ2xꢀmode,ꢀtheꢀavailableꢀcurrentꢀisꢀgivenꢀby:ꢀ
RegulationꢀisꢀachievedꢀbyꢀsensingꢀtheꢀvoltageꢀatꢀtheꢀCPOꢀ
pinꢀ andꢀ modulatingꢀ theꢀ chargeꢀ pumpꢀ strengthꢀ basedꢀ
onꢀtheꢀerrorꢀsignal.ꢀTheꢀCPOꢀregulationꢀvoltagesꢀareꢀsetꢀ
internally,ꢀandꢀareꢀdependentꢀonꢀtheꢀchargeꢀpumpꢀmodesꢀ
asꢀshownꢀinꢀTableꢀ1.
(2VBAT – VCPO
ROL
)
IOUT
=
ꢀ
Noticeꢀthatꢀtheꢀadvantageꢀvoltageꢀinꢀthisꢀcaseꢀisꢀ3.1Vꢀ•ꢀ2ꢀ
–ꢀ3.8Vꢀ–ꢀ0.1Vꢀ=ꢀ2.3V.ꢀR ꢀisꢀhigherꢀinꢀ2xꢀmodeꢀbutꢀaꢀsig-
OL
Table 1. Charge Pump Output Regulation Voltages
nificantꢀoverallꢀincreaseꢀinꢀavailableꢀcurrentꢀisꢀachieved.
CHARGE PUMP MODE
REGULATED V
4.55V
CPO
TypicalꢀvaluesꢀofꢀR ꢀasꢀaꢀfunctionꢀofꢀtemperatureꢀareꢀ
1.5x
2x
OL
shownꢀinꢀFigureꢀ3ꢀandꢀFigureꢀ4.
5.05V
Shutdown Current
WhenꢀtheꢀLTC3210-2/LTC3210-3ꢀoperateꢀinꢀeitherꢀ1.5xꢀ
modeꢀorꢀ2xꢀmode,ꢀtheꢀchargeꢀpumpꢀcanꢀbeꢀmodeledꢀasꢀ
aꢀThevenin-equivalentꢀcircuitꢀtoꢀdetermineꢀtheꢀamountꢀofꢀ
currentꢀavailableꢀfromꢀtheꢀeffectiveꢀinputꢀvoltageꢀandꢀef-
Inꢀshutdownꢀmodeꢀallꢀtheꢀcircuitryꢀisꢀturnedꢀoffꢀandꢀtheꢀ
BAT
supply.ꢀFurthermore,ꢀCPOꢀisꢀweaklyꢀconnectedꢀtoꢀV .ꢀTheꢀ
fectiveꢀopen-loopꢀoutputꢀresistance,ꢀR ꢀ(Figureꢀ2).
OL
LTC3210-2/LTC3210-3ꢀenterꢀshutdownꢀmodeꢀwhenꢀbothꢀtheꢀ
ENMꢀandꢀENCꢀpinsꢀareꢀbroughtꢀlowꢀatꢀ150µsꢀ(typ).ꢀENMꢀ
R ꢀisꢀdependentꢀonꢀaꢀnumberꢀofꢀfactorsꢀincludingꢀtheꢀ
OL
switchingꢀterm,ꢀ1/(2f ꢀ•ꢀC ),ꢀinternalꢀswitchꢀresis-
OSC
FLY
3.8
V
V
= 3V
tancesꢀandꢀtheꢀnonoverlapꢀperiodꢀofꢀtheꢀswitchingꢀcircuit.ꢀ
BAT
CPO
= 4.2V
3.6
However,ꢀforꢀaꢀgivenꢀR ,ꢀtheꢀamountꢀofꢀcurrentꢀavailableꢀ
OL
C2 = C3 = C4 = 2.2µF
willꢀbeꢀdirectlyꢀproportionalꢀtoꢀtheꢀadvantageꢀvoltageꢀofꢀ
3.4
3.2
3.0
2.8
2.6
2.4
1.5V ꢀ–ꢀCPOꢀforꢀ1.5xꢀmodeꢀandꢀ2V ꢀ–ꢀCPOꢀforꢀ2xꢀ
BAT
BAT
R
OL
+
+
CPO
1.5V
OR 2V
BAT
BAT
–
–
–15
10
35
85
–40
60
TEMPERATURE (°C)
321023 F03
321023 F02
Figure 3. Typical 1.5x ROL vs Temperature
Figure 2. Charge Pump Thevenin Equivalent Open-Loop Circuit
321023fb
ꢀ0
LTC3210-2/LTC3210-3
operaTion
4.6
thermalꢀshutꢀdownꢀwillꢀoccur.ꢀThisꢀwillꢀdisableꢀallꢀofꢀtheꢀ
currentꢀsourcesꢀandꢀchargeꢀpumpꢀuntilꢀtheꢀdieꢀhasꢀcooledꢀ
byꢀaboutꢀ15°C.ꢀThisꢀthermalꢀcyclingꢀwillꢀcontinueꢀuntilꢀtheꢀ
faultꢀhasꢀbeenꢀcorrected.
V
V
= 3V
BAT
CPO
= 4.8V
4.4
C2 = C3 = C4 = 2.2µF
4.2
4.0
3.8
3.6
3.4
3.2
Mode Switching
TheꢀLTC3210-2/LTC3210-3ꢀwillꢀautomaticallyꢀswitchꢀfromꢀ
1xꢀ modeꢀ toꢀ 1.5xꢀ modeꢀ andꢀ subsequentlyꢀ toꢀ 2xꢀ modeꢀ
wheneverꢀaꢀdropoutꢀconditionꢀisꢀdetectedꢀatꢀanꢀLEDꢀpin.ꢀ
Dropoutꢀoccursꢀwhenꢀaꢀcurrentꢀsourceꢀvoltageꢀbecomesꢀ
tooꢀlowꢀforꢀtheꢀprogrammedꢀcurrentꢀtoꢀbeꢀsupplied.ꢀTheꢀ
timeꢀfromꢀdrop-outꢀdetectionꢀtoꢀmodeꢀswitchingꢀisꢀtypi-
callyꢀ0.4ms.ꢀ
–15
10
35
85
–40
60
TEMPERATURE (°C)
321023 F04
Figure 4. Typical 2x ROL vs Temperature
Theꢀpartꢀisꢀresetꢀbackꢀtoꢀ1xꢀmodeꢀwhenꢀtheꢀpartꢀisꢀshutꢀ
downꢀ(ENMꢀ=ꢀENCꢀ=ꢀLow)ꢀorꢀonꢀtheꢀfallingꢀedgeꢀofꢀENC.ꢀ
Anꢀinternalꢀcomparatorꢀwillꢀnotꢀallowꢀtheꢀmainꢀswitchesꢀtoꢀ
andꢀENCꢀhaveꢀ250kꢀinternalꢀpullꢀdownꢀresistorsꢀtoꢀdefineꢀ
theꢀshutdownꢀstateꢀwhenꢀtheꢀdriversꢀareꢀinꢀaꢀhighꢀimped-ꢀ
anceꢀstate.
connectꢀV ꢀandꢀCPOꢀinꢀ1xꢀmodeꢀuntilꢀtheꢀvoltageꢀatꢀtheꢀ
BAT
CPOꢀpinꢀhasꢀdecayedꢀtoꢀlessꢀthanꢀorꢀequalꢀtoꢀtheꢀvoltageꢀ
Thermal Protection
atꢀtheꢀV ꢀpin.
BAT
TheꢀLTC3210-2/LTC3210-3ꢀhaveꢀbuilt-inꢀovertemperatureꢀ
protection.ꢀAtꢀinternalꢀdieꢀtemperaturesꢀofꢀaroundꢀ150°Cꢀ
applicaTions inForMaTion
V
, CPO Capacitor Selection
BAT
whereꢀf ꢀisꢀtheꢀLTC3210-2/LTC3210-3ꢀoscillatorꢀfre-
OSC
quencyꢀorꢀtypicallyꢀ800kHzꢀandꢀC ꢀisꢀtheꢀoutputꢀstorageꢀ
CPO
Theꢀ styleꢀ andꢀ valueꢀ ofꢀ theꢀ capacitorsꢀ usedꢀ withꢀ theꢀ
LTC3210-2/LTC3210-3ꢀdetermineꢀseveralꢀimportantꢀpa-
capacitor.
rametersꢀsuchꢀasꢀregulatorꢀcontrolꢀloopꢀstability,ꢀoutputꢀ Theꢀoutputꢀrippleꢀinꢀ2xꢀmodeꢀisꢀveryꢀsmallꢀdueꢀtoꢀtheꢀfactꢀ
ripple,ꢀ chargeꢀ pumpꢀ strengthꢀ andꢀ minimumꢀ start-upꢀ thatꢀloadꢀcurrentꢀisꢀsuppliedꢀonꢀbothꢀcyclesꢀofꢀtheꢀclock.
time.
Bothꢀstyleꢀandꢀvalueꢀofꢀtheꢀoutputꢀcapacitorꢀcanꢀsignificantlyꢀ
Toꢀreduceꢀnoiseꢀandꢀripple,ꢀitꢀisꢀrecommendedꢀthatꢀlowꢀ affectꢀtheꢀstabilityꢀofꢀtheꢀLTC3210-2/LTC3210-3.ꢀAsꢀshownꢀ
equivalentꢀseriesꢀresistanceꢀ(ESR)ꢀceramicꢀcapacitorsꢀareꢀ inꢀtheꢀBlockꢀDiagram,ꢀtheꢀLTC3210-2/LTC3210-3ꢀuseꢀaꢀ
usedꢀforꢀbothꢀCV ꢀandꢀC .ꢀTantalumꢀandꢀaluminumꢀ controlꢀloopꢀtoꢀadjustꢀtheꢀstrengthꢀofꢀtheꢀchargeꢀpumpꢀtoꢀ
BAT
CPO
capacitorsꢀareꢀnotꢀrecommendedꢀdueꢀtoꢀhighꢀESR.
matchꢀtheꢀrequiredꢀoutputꢀcurrent.ꢀTheꢀerrorꢀsignalꢀofꢀtheꢀ
loopꢀisꢀstoredꢀdirectlyꢀonꢀtheꢀoutputꢀcapacitor.ꢀTheꢀoutputꢀ
capacitorꢀalsoꢀservesꢀasꢀtheꢀdominantꢀpoleꢀforꢀtheꢀcontrolꢀ
loop.ꢀToꢀpreventꢀringingꢀorꢀinstability,ꢀitꢀisꢀimportantꢀforꢀtheꢀ
outputꢀcapacitorꢀtoꢀmaintainꢀatꢀleastꢀ1.3µFꢀofꢀcapacitanceꢀ
overꢀallꢀconditions.
TheꢀvalueꢀofꢀC ꢀdirectlyꢀcontrolsꢀtheꢀamountꢀofꢀoutputꢀ
CPO
rippleꢀforꢀaꢀgivenꢀloadꢀcurrent.ꢀIncreasingꢀtheꢀsizeꢀofꢀC
ꢀ
CPO
willꢀreduceꢀoutputꢀrippleꢀatꢀtheꢀexpenseꢀofꢀhigherꢀstart-upꢀ
current.ꢀTheꢀpeak-to-peakꢀoutputꢀrippleꢀofꢀtheꢀ1.5xꢀmodeꢀ
isꢀapproximatelyꢀgivenꢀbyꢀtheꢀexpression:
Inꢀaddition,ꢀexcessiveꢀoutputꢀcapacitorꢀESRꢀ>100mΩꢀwillꢀ
tendꢀtoꢀdegradeꢀtheꢀloopꢀstability.ꢀMultilayerꢀceramicꢀchipꢀ
capacitorsꢀtypicallyꢀhaveꢀexceptionalꢀESRꢀperformanceꢀandꢀ
IOUT
(3f0SC •CCPO
VRIPPLE(P−P)
=
(3)
)
ꢀ
ꢀ
321023fb
ꢀꢀ
LTC3210-2/LTC3210-3
applicaTions inForMaTion
whenꢀcombinedꢀwithꢀaꢀtightꢀboardꢀlayoutꢀwillꢀresultꢀinꢀveryꢀ
loseꢀconsiderableꢀcapacitanceꢀoverꢀthatꢀrange.ꢀCapacitorsꢀ
mayꢀalsoꢀhaveꢀaꢀveryꢀpoorꢀvoltageꢀcoefficientꢀcausingꢀthemꢀ
toꢀloseꢀ60%ꢀorꢀmoreꢀofꢀtheirꢀcapacitanceꢀwhenꢀtheꢀratedꢀ
voltageꢀisꢀapplied.ꢀTherefore,ꢀwhenꢀcomparingꢀdifferentꢀ
capacitors,ꢀitꢀisꢀoftenꢀmoreꢀappropriateꢀtoꢀcompareꢀtheꢀ
amountꢀofꢀachievableꢀcapacitanceꢀforꢀaꢀgivenꢀcaseꢀsizeꢀ
ratherꢀthanꢀcomparingꢀtheꢀspecifiedꢀcapacitanceꢀvalue.ꢀForꢀ
example,ꢀoverꢀratedꢀvoltageꢀandꢀtemperatureꢀconditions,ꢀ
aꢀ1µF,ꢀ10V,ꢀY5Vꢀceramicꢀcapacitorꢀinꢀaꢀ0603ꢀcaseꢀmayꢀnotꢀ
provideꢀanyꢀmoreꢀcapacitanceꢀthanꢀaꢀ0.22µF,ꢀ10V,ꢀX7Rꢀ
availableꢀinꢀtheꢀsameꢀcase.ꢀTheꢀcapacitorꢀmanufacturer’sꢀ
dataꢀsheetꢀshouldꢀbeꢀconsultedꢀtoꢀdetermineꢀwhatꢀvalueꢀ
ofꢀcapacitorꢀisꢀneededꢀtoꢀensureꢀminimumꢀcapacitancesꢀ
atꢀallꢀtemperaturesꢀandꢀvoltages.
goodꢀstability.ꢀAsꢀtheꢀvalueꢀofꢀC ꢀcontrolsꢀtheꢀamountꢀ
CPO
ofꢀoutputꢀripple,ꢀtheꢀvalueꢀofꢀCV ꢀcontrolsꢀtheꢀamountꢀ
BAT
ofꢀrippleꢀpresentꢀatꢀtheꢀinputꢀpin(V ).ꢀTheꢀLTC3210-2/
BAT
LTC3210-3’sꢀinputꢀcurrentꢀwillꢀbeꢀrelativelyꢀconstantꢀwhileꢀ
theꢀchargeꢀpumpꢀisꢀeitherꢀinꢀtheꢀinputꢀchargingꢀphaseꢀorꢀ
theꢀoutputꢀchargingꢀphaseꢀbutꢀwillꢀdropꢀtoꢀzeroꢀduringꢀ
theꢀclockꢀnonoverlapꢀtimes.ꢀSinceꢀtheꢀnonoverlapꢀtimeꢀ
isꢀsmallꢀ(~35ns),ꢀtheseꢀmissingꢀ“notches”ꢀwillꢀresultꢀinꢀ
onlyꢀaꢀsmallꢀperturbationꢀonꢀtheꢀinputꢀpowerꢀsupplyꢀline.ꢀ
NoteꢀthatꢀaꢀhigherꢀESRꢀcapacitorꢀsuchꢀasꢀtantalumꢀwillꢀ
haveꢀhigherꢀinputꢀnoiseꢀdueꢀtoꢀtheꢀhigherꢀESR.ꢀTherefore,ꢀ
ceramicꢀcapacitorsꢀareꢀrecommendedꢀforꢀlowꢀESR.ꢀInputꢀ
noiseꢀcanꢀbeꢀfurtherꢀreducedꢀbyꢀpoweringꢀtheꢀLTC3210-2/
LTC3210-3ꢀthroughꢀaꢀveryꢀsmallꢀseriesꢀinductorꢀasꢀshownꢀ
inꢀFigureꢀ5.ꢀAꢀ10nHꢀinductorꢀwillꢀrejectꢀtheꢀfastꢀcurrentꢀ
notches,ꢀ therebyꢀ presentingꢀ aꢀ nearlyꢀ constantꢀ currentꢀ
loadꢀtoꢀtheꢀinputꢀpowerꢀsupply.ꢀForꢀeconomy,ꢀtheꢀ10nHꢀ
inductorꢀcanꢀbeꢀfabricatedꢀonꢀtheꢀPCꢀboardꢀwithꢀaboutꢀ
1cmꢀ(0.4")ꢀofꢀPCꢀboardꢀtrace.
Tableꢀ2ꢀshowsꢀaꢀlistꢀofꢀceramicꢀcapacitorꢀmanufacturersꢀ
andꢀhowꢀtoꢀcontactꢀthem:
Table 2. Recommended Capacitor Vendors
AVX
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
Kemet
Murata
TaiyoꢀYuden
Vishay
V
BAT
LTC3210-2
LTC3210-3
GND
321023 F05
Layout Considerations and Noise
Figure 5. 10nH Inductor Used for Input Noise
Reduction (Approximately 1cm of Board Trace)
Dueꢀtoꢀtheꢀhighꢀswitchingꢀfrequencyꢀandꢀtheꢀtransientꢀ
currentsꢀproducedꢀbyꢀtheꢀLTC3210-2/LTC3210-3,ꢀcarefulꢀ
boardꢀlayoutꢀisꢀnecessary.ꢀAꢀtrueꢀgroundꢀplaneꢀandꢀshortꢀ
connectionsꢀtoꢀallꢀcapacitorsꢀwillꢀimproveꢀperformanceꢀ
andꢀensureꢀproperꢀregulationꢀunderꢀallꢀconditions.ꢀ
Flying Capacitor Selection
Warning: Polarized capacitors such as tantalum or
aluminum should never be used for the flying capaci-
tors since their voltage can reverse upon start-up of
the LTC3210-2/LTC3210-3. Ceramic capacitors should
always be used for the flying capacitors.
TheꢀflyingꢀcapacitorꢀpinsꢀC1P,ꢀC2P,ꢀC1MꢀandꢀC2Mꢀwillꢀhaveꢀ
highꢀedgeꢀrateꢀwaveforms.ꢀTheꢀlargeꢀdv/dtꢀonꢀtheseꢀpinsꢀ
canꢀcoupleꢀenergyꢀcapacitivelyꢀtoꢀadjacentꢀPCBꢀruns.ꢀMag-
neticꢀfieldsꢀcanꢀalsoꢀbeꢀgeneratedꢀifꢀtheꢀflyingꢀcapacitorsꢀ
areꢀnotꢀcloseꢀtoꢀtheꢀLTC3210-2/LTC3210-3ꢀ(i.e.,ꢀtheꢀloopꢀ
areaꢀisꢀlarge).ꢀToꢀdecoupleꢀcapacitiveꢀenergyꢀtransfer,ꢀaꢀ
Faradayꢀshieldꢀmayꢀbeꢀused.ꢀThisꢀisꢀaꢀgroundedꢀPCBꢀtraceꢀ
betweenꢀtheꢀsensitiveꢀnodeꢀandꢀtheꢀLTC3210-2/LTC3210-3ꢀ
pins.ꢀForꢀaꢀhighꢀqualityꢀACꢀground,ꢀitꢀshouldꢀbeꢀreturnedꢀ
toꢀaꢀsolidꢀgroundꢀplaneꢀthatꢀextendsꢀallꢀtheꢀwayꢀtoꢀtheꢀ
LTC3210-2/LTC3210-3.
Theꢀflyingꢀcapacitorsꢀcontrolꢀtheꢀstrengthꢀofꢀtheꢀchargeꢀ
pump.ꢀInꢀorderꢀtoꢀachieveꢀtheꢀratedꢀoutputꢀcurrentꢀitꢀisꢀ
necessaryꢀtoꢀhaveꢀatꢀleastꢀ1.6µFꢀofꢀcapacitanceꢀforꢀeachꢀ
ofꢀtheꢀflyingꢀcapacitors.ꢀCapacitorsꢀofꢀdifferentꢀmaterialsꢀ
loseꢀtheirꢀcapacitanceꢀwithꢀhigherꢀtemperatureꢀandꢀvoltageꢀ
atꢀdifferentꢀrates.ꢀForꢀexample,ꢀaꢀceramicꢀcapacitorꢀmadeꢀ
ofꢀX7Rꢀmaterialꢀwillꢀretainꢀmostꢀofꢀitsꢀcapacitanceꢀfromꢀ
–40°Cꢀtoꢀ85°CꢀwhereasꢀaꢀZ5UꢀorꢀY5Vꢀstyleꢀcapacitorꢀwillꢀ
321023fb
ꢀꢁ
LTC3210-2/LTC3210-3
applicaTions inForMaTion
Theꢀfollowingꢀguidelinesꢀshouldꢀbeꢀfollowedꢀwhenꢀdesign-
ingꢀaꢀPCBꢀlayoutꢀforꢀtheꢀLTC3210-2/LTC3210-3:
sinceꢀtheꢀinputꢀcurrentꢀwillꢀbeꢀveryꢀcloseꢀtoꢀtheꢀsumꢀofꢀ
theꢀLEDꢀcurrents.
Atꢀmoderateꢀtoꢀhighꢀoutputꢀpower,ꢀtheꢀquiescentꢀcurrentꢀ
ofꢀtheꢀLTC3210-2/LTC3210-3ꢀisꢀnegligibleꢀandꢀtheꢀexpres-
sionꢀaboveꢀisꢀvalid.ꢀ
•ꢀ TheꢀExposedꢀPadꢀshouldꢀbeꢀsolderedꢀtoꢀaꢀlargeꢀcop-
perꢀplaneꢀthatꢀisꢀconnectedꢀtoꢀaꢀsolid,ꢀlowꢀimpedanceꢀ
groundꢀplaneꢀusingꢀplatedꢀthrough-holeꢀviasꢀforꢀproperꢀ
heatꢀsinkingꢀandꢀnoiseꢀprotection.
OnceꢀdropoutꢀisꢀdetectedꢀatꢀanyꢀLEDꢀpin,ꢀtheꢀLTC3210-2/
LTC3210-3ꢀenableꢀtheꢀchargeꢀpumpꢀinꢀ1.5xꢀmode.
•ꢀ Inputꢀandꢀoutputꢀcapacitorsꢀmustꢀbeꢀplacedꢀcloseꢀtoꢀ
theꢀpart.
Inꢀ1.5xꢀboostꢀmode,ꢀtheꢀefficiencyꢀisꢀsimilarꢀtoꢀthatꢀofꢀaꢀ
linearꢀregulatorꢀwithꢀanꢀeffectiveꢀinputꢀvoltageꢀofꢀ1.5ꢀtimesꢀ
theꢀactualꢀinputꢀvoltage.ꢀThisꢀisꢀbecauseꢀtheꢀinputꢀcurrentꢀ
forꢀaꢀ1.5xꢀchargeꢀpumpꢀisꢀapproximatelyꢀ1.5ꢀtimesꢀtheꢀ
loadꢀcurrent.ꢀInꢀanꢀidealꢀ1.5xꢀchargeꢀpump,ꢀtheꢀpowerꢀ
efficiencyꢀwouldꢀbeꢀgivenꢀby:
•ꢀ Theꢀflyingꢀcapacitorsꢀmustꢀbeꢀplacedꢀcloseꢀtoꢀtheꢀpart.ꢀ
Theꢀtracesꢀfromꢀtheꢀpinsꢀtoꢀtheꢀcapacitorꢀpadꢀshouldꢀ
beꢀasꢀwideꢀasꢀpossible.
•ꢀ V ,ꢀCPOꢀtracesꢀmustꢀbeꢀwideꢀtoꢀminimizeꢀinductanceꢀ
BAT
andꢀhandleꢀhighꢀcurrents.
PLED
PIN
(VLED •ILED
(VBAT •(1.5)•ILED
)
VLED
(1.5•VBAT )
•ꢀ LEDꢀpadsꢀmustꢀbeꢀlargeꢀandꢀconnectedꢀtoꢀotherꢀlayersꢀ
ofꢀmetalꢀtoꢀensureꢀproperꢀheatꢀsinking.
η
IDEAL
=
=
=
)
ꢀ
•ꢀ RMꢀandꢀRCꢀpinsꢀareꢀsensitiveꢀtoꢀnoiseꢀandꢀcapacitance.ꢀ
Theꢀresistorsꢀshouldꢀbeꢀplacedꢀnearꢀtheꢀpartꢀwithꢀmini-
mumꢀlineꢀwidth.
Similarly,ꢀinꢀ2xꢀboostꢀmode,ꢀtheꢀefficiencyꢀisꢀsimilarꢀtoꢀ
thatꢀofꢀaꢀlinearꢀregulatorꢀwithꢀanꢀeffectiveꢀinputꢀvoltageꢀ
ofꢀ2ꢀtimesꢀtheꢀactualꢀinputꢀvoltage.ꢀInꢀanꢀidealꢀ2xꢀchargeꢀ
pump,ꢀtheꢀpowerꢀefficiencyꢀwouldꢀbeꢀgivenꢀby:
Power Efficiency
PLED
(VLED •ILED
)
VLED
(2•VBAT )
η
IDEAL
=
=
=
Toꢀ calculateꢀ theꢀ powerꢀ efficiencyꢀ (η)ꢀ ofꢀ aꢀ whiteꢀ LEDꢀ
driverꢀchip,ꢀtheꢀLEDꢀpowerꢀshouldꢀbeꢀcomparedꢀtoꢀtheꢀ
inputꢀpower.ꢀTheꢀdifferenceꢀbetweenꢀtheseꢀtwoꢀnumbersꢀ
representsꢀlostꢀpowerꢀwhetherꢀitꢀisꢀinꢀtheꢀchargeꢀpumpꢀ
orꢀtheꢀcurrentꢀsources.ꢀStatedꢀmathematically,ꢀtheꢀpowerꢀ
efficiencyꢀisꢀgivenꢀby:
PIN (VBAT •(2)•ILED
)
ꢀ
Thermal Management
Forꢀ higherꢀ inputꢀ voltagesꢀ andꢀ maximumꢀ outputꢀ cur-
rent,ꢀthereꢀcanꢀbeꢀsubstantialꢀpowerꢀdissipationꢀinꢀtheꢀ
LTC3210-2/LTC3210-3.ꢀ Ifꢀ theꢀ junctionꢀ temperatureꢀ
increasesꢀaboveꢀapproximatelyꢀ150°Cꢀtheꢀthermalꢀshutꢀ
downꢀ circuitryꢀ willꢀ automaticallyꢀ deactivateꢀ theꢀ outputꢀ
currentꢀsourcesꢀandꢀchargeꢀpump.ꢀToꢀreduceꢀmaximumꢀ
junctionꢀtemperature,ꢀaꢀgoodꢀthermalꢀconnectionꢀtoꢀtheꢀ
PCꢀboardꢀisꢀrecommended.ꢀConnectingꢀtheꢀExposedꢀPadꢀ
toꢀaꢀgroundꢀplaneꢀandꢀmaintainingꢀaꢀsolidꢀgroundꢀplaneꢀ
underꢀtheꢀdeviceꢀwillꢀreduceꢀtheꢀthermalꢀresistanceꢀofꢀtheꢀ
packageꢀandꢀPCꢀboardꢀconsiderably.
PLED
PIN
η =
ꢀ
TheꢀefficiencyꢀofꢀtheꢀLTC3210-2/LTC3210-3ꢀdependsꢀuponꢀ
theꢀmodeꢀinꢀwhichꢀitꢀisꢀoperating.ꢀRecallꢀthatꢀtheꢀLTC3210-2/
LTC3210-3ꢀoperatesꢀasꢀaꢀpassꢀswitch,ꢀconnectingꢀV ꢀtoꢀ
BAT
CPO,ꢀuntilꢀdropoutꢀisꢀdetectedꢀatꢀtheꢀLEDꢀpin.ꢀThisꢀfeatureꢀ
providesꢀtheꢀoptimumꢀefficiencyꢀavailableꢀforꢀaꢀgivenꢀinputꢀ
voltageꢀandꢀLEDꢀforwardꢀvoltage.ꢀWhenꢀitꢀisꢀoperatingꢀasꢀ
aꢀswitch,ꢀtheꢀefficiencyꢀisꢀapproximatedꢀby:
PLED
PIN
(VLED •ILED
(VBAT •IBAT
)
)
VLED
VBAT
η =
=
=
ꢀ
321023fb
ꢀꢂ
LTC3210-2/LTC3210-3
package DescripTion
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(ReferenceꢀLTCꢀDWGꢀ#ꢀ05-08-1691)
0.70 p0.05
3.50 p 0.05
2.10 p 0.05
1.45 p 0.05
(4 SIDES)
PACKAGE OUTLINE
0.25 p0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
BOTTOM VIEW—EXPOSED PAD
PIN 1 NOTCH R = 0.20 TYP
OR 0.25 s 45o CHAMFER
R = 0.115
TYP
0.75 p 0.05
3.00 p 0.10
(4 SIDES)
15 16
PIN 1
TOP MARK
(NOTE 6)
0.40 p 0.10
1
2
1.45 p 0.10
(4-SIDES)
(UD16) QFN 0904
0.200 REF
0.25 p 0.05
0.00 – 0.05
0.50 BSC
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
321023fb
ꢀꢃ
LTC3210-2/LTC3210-3
revision hisTory (Revision history begins at Rev B)
REV
DATE
DESCRIPTION
PAGE NUMBER
B
6/10
UpdateꢀtoꢀNoteꢀ3
3
321023fb
InformationꢀfurnishedꢀbyꢀLinearꢀTechnologyꢀCorporationꢀisꢀbelievedꢀtoꢀbeꢀaccurateꢀandꢀreliable.ꢀ
However,ꢀnoꢀresponsibilityꢀisꢀassumedꢀforꢀitsꢀuse.ꢀLinearꢀTechnologyꢀCorporationꢀmakesꢀnoꢀrepresenta-
tionꢀthatꢀtheꢀinterconnectionꢀofꢀitsꢀcircuitsꢀasꢀdescribedꢀhereinꢀwillꢀnotꢀinfringeꢀonꢀexistingꢀpatentꢀrights.
ꢀꢄ
LTC3210-2/LTC3210-3
Typical applicaTion
3-LED MAIN, One LED Camera
C2
2.2µF
C3
2.2µF
C1P C1M
C2P
C2M
CPO
MAIN
CAM
V
V
BAT
BAT
C4
2.2µF
C1
2.2µF
LTC3210-3
MLED1
MLED2
MLED3
CLED
ENM
ENC
ENM
ENC
321023 TA02
RM
30.1k
RC
GND
24.3k
1%
1%
relaTeD parTs
PART NUMBER
DESCRIPTION
COMMENTS
LT1618
ConstantꢀCurrent,ꢀ1.4MHz,ꢀ1.5AꢀBoostꢀConverter VIN:ꢀ1.6Vꢀtoꢀ18V,ꢀVOUT(MAX)ꢀ=ꢀ36V,ꢀIQꢀ=ꢀ1.8mA,ꢀISDꢀ<1µA,ꢀMSꢀPackage
LTC3205
250mA,ꢀ1MHz,ꢀMulti-DisplayꢀLEDꢀController
400mA,ꢀ800kHz,ꢀMulti-DisplayꢀLEDꢀController
VIN:ꢀ2.8Vꢀtoꢀ4.5V,ꢀVOUT(MAX)ꢀ=ꢀ5.5V,ꢀIQꢀ=ꢀ50µA,ꢀISDꢀ<1µA,ꢀQFNꢀPackage
VIN:ꢀ2.8Vꢀtoꢀ4.5V,ꢀVOUT(MAX)ꢀ=ꢀ5.5V,ꢀIQꢀ=ꢀ50µA,ꢀISDꢀ<1µA,ꢀQFNꢀPackage
LTC3206
LTC3208
HighꢀCurrentꢀSoftwareꢀConfigurableꢀMulti-Displayꢀ VIN:ꢀ2.9Vꢀtoꢀ4.5V,ꢀVOUT(MAX)ꢀ=ꢀ5.5V,ꢀIQꢀ=ꢀ250µA,ꢀISDꢀ<3µA,ꢀ17ꢀCurrentꢀSourcesꢀ
LEDꢀController
(MAIN,ꢀSUB,ꢀRGB,ꢀCAM,ꢀAUX),ꢀ5mmꢀ×ꢀ5mmꢀQFNꢀPackage
LTC3209-1/ꢀ
LTC3209-2
600mAꢀMAIN/Camera/AUXꢀLEDꢀController
VIN:ꢀ2.9Vꢀtoꢀ4.5V,ꢀIQꢀ=ꢀ400mA,ꢀUpꢀtoꢀ94%ꢀEfficiency,ꢀ4mmꢀ×ꢀ4mmꢀꢀ
QFN-20ꢀPackage
LTC3210
VIN:ꢀ2.9Vꢀtoꢀ4.5V,ꢀIQꢀ=ꢀ400µA,ꢀ3-BitꢀDACꢀBrightnessꢀControlꢀforꢀMAINꢀandꢀCAMꢀ
LEDs,ꢀ3mmꢀ×ꢀ3mmꢀQFNꢀPackage
MAIN/CAMꢀLEDꢀControllerꢀinꢀ3mmꢀ×ꢀ3mmꢀQFN
LTC3210-1
MAIN/CAMꢀLEDꢀControllerꢀwithꢀ64-Stepꢀ
BrightnessꢀControl
6-BitꢀDACꢀBrightnessꢀControlꢀforꢀMAINꢀandꢀ3-BitꢀBrightnessꢀControlꢀforꢀCAM,ꢀ
3mmꢀ×ꢀ3mmꢀQFNꢀPackage
LTC3214
LTC3215
500mAꢀCameraꢀLEDꢀChargeꢀPump
VIN:ꢀ2.9Vꢀtoꢀ4.5V,ꢀꢀSingleꢀOutput,ꢀ3mmꢀ×ꢀ3mmꢀDFNꢀPackage
700mAꢀLowꢀNoiseꢀHighꢀCurrentꢀLEDꢀꢀ
ChargeꢀPump
VIN:ꢀ2.9Vꢀtoꢀ4.4V,ꢀVOUT(MAX)ꢀ=ꢀ5.5V,ꢀIQꢀ=ꢀ300µA,ꢀISDꢀ<2.5µA,ꢀDFNꢀPackage
LTC3216
1AꢀLowꢀNoiseꢀHighꢀCurrentꢀLEDꢀChargeꢀPumpꢀ
withꢀIndependentꢀFlash/TorchꢀCurrentꢀControl
VIN:ꢀ2.9Vꢀtoꢀ4.4V,ꢀVOUT(MAX)ꢀ=ꢀ5.5V,ꢀIQꢀ=ꢀ300µA,ꢀISDꢀ<2.5µA,ꢀDFNꢀPackage
LTC3217
600mAꢀLowꢀNoiseꢀMulti-LEDꢀCameraꢀLight
VIN:ꢀ2.9Vꢀtoꢀ4.4V,ꢀI ꢀ=ꢀ400µA,ꢀFourꢀ100mAꢀOutputs,ꢀQFNꢀPackage
Q
LTC3440/LTC3441
600mA/1.2AꢀIOUT,ꢀ2MHz/1MHz,ꢀSynchronousꢀꢀ
Buck-BoostꢀDC/DCꢀConverter
VIN:ꢀ2.4Vꢀtoꢀ5.5V,ꢀVOUT(MAX)ꢀ=ꢀ5.25V,ꢀIQꢀ=ꢀ25µA/50µA,ꢀISDꢀ<1µA,ꢀꢀ
MS/DFNꢀPackages
LTC3443
600mA/1.2AꢀIOUT,ꢀ600kHz,ꢀSynchronousꢀꢀ
Buck-BoostꢀDC/DCꢀConverter
VIN:ꢀ2.4Vꢀtoꢀ5.5V,ꢀVOUT(MAX)ꢀ=ꢀ5.25V,ꢀIQꢀ=ꢀ28µA,ꢀISDꢀ<1µA,ꢀDFNꢀPackage
LTC3453
1MHz,ꢀ800mAꢀSynchronousꢀBuck-BoostꢀHighꢀ
PowerꢀLEDꢀDriver
VIN(MIN):ꢀ2.7Vꢀtoꢀ5.5V,ꢀVIN(MAX):ꢀ2.7Vꢀtoꢀ4.5V,ꢀIQꢀ=ꢀ2.5mA,ꢀISDꢀ<6µA,ꢀꢀ
QFNꢀPackage
LT3467/LT3467A
LT3479
1.1Aꢀ(ISW),ꢀ1.3/2.1MHz,ꢀHighꢀEfficiencyꢀStep-Upꢀ VIN:ꢀ2.4Vꢀtoꢀ16V,ꢀVOUT(MAX)ꢀ=ꢀ40V,ꢀIQꢀ=ꢀ1.2mA,ꢀISDꢀ<1µA,ꢀThinSOTꢀPackage
DC/DCꢀConvertersꢀwithꢀIntegratedꢀSoft-Start
3A,ꢀ42V,ꢀ3.5MHzꢀBoostꢀConverter
VIN:ꢀ2.5Vꢀtoꢀ24V,ꢀVOUT(MAX)ꢀ=ꢀ40V,ꢀIQꢀ=ꢀ2µA,ꢀISDꢀ<1µAꢀDFN,ꢀTSSOPꢀPackages
321023fb
LT 0610 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢅ
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LINEAR TECHNOLOGY CORPORATION 2006
(408)432-1900 FAX: (408) 434-0507 www.linear.com
相关型号：
LTC3210EUD-2#PBF
LTC3210-2/LTC3210-3 - MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm x 3mm QFN; Package: QFN; Pins: 16; Temperature Range: -40°C to 85°C
Linear
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