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PDF LTC3210 Data sheet ( Hoja de datos )
| Número de pieza | LTC3210 | |
| Descripción | MAIN/CAM LED Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3210 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
■ Low Noise Charge Pump Provides High Efficiency
with Automatic Mode Switching
■ Multimode Operation: 1x, 1.5x, 2x
■ Individual Full-Scale Current Set Resistors
■ Up to 500mA Total Output Current
■ Single Wire EN/Brightness Control for MAIN and
CAM LEDs (8 Brightness Steps)
■ 64:1 Brightness Control Range for MAIN Display
■ Four 25mA Low Dropout MAIN LED Outputs
■ One 400mA Low Dropout CAM LED Output
■ Low Noise Constant Frequency Operation*
■ Low Shutdown Current: 3µA
■ Internal Soft-Start Limits Inrush Current During
Startup and Mode Switching
■ Open/Short LED Protection
■ No Inductors
■ 3mm × 3mm 16-Lead Plastic QFN Package
U
APPLICATIO S
■ Multi-LED Light Supply for Cellphones/DSCs/PDAs
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 6411531.
LTC3210www.DataSheet4U.com
MAIN/CAM LED Controller
in 3mm × 3mm QFN
DESCRIPTIO
The LTC®3210 is a low noise charge pump DC/DC converter
designed to drive four MAIN LEDs and one high current
CAM LED for camera lighting. The LTC3210 requires only
four small ceramic capacitors and two current set resis-
tors to form a complete LED power supply and current
controller.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up and mode changes. High switching
frequency enables the use of small external capacitors.
Independent MAIN and CAM full-scale current settings
are programmed by two external resistors. Shutdown
mode and current output levels are selected via two logic
inputs.
The full-scale current through the LEDs is programmed
via external resistors. ENM and ENC are toggled to adjust
the LED currents via internal counters and DACs. The
part is shut down when both ENM and ENC are low for
150µs (typ).
The charge pump optimizes efficiency based on the volt-
age across the LED current sources. The part powers up
in 1x mode and will automatically switch to boost mode
whenever any enabled LED current source begins to en-
ter dropout. The LTC3210 is available in a 3mm × 3mm
16-lead QFN package.
TYPICAL APPLICATIO
C2
2.2µF
C3
2.2µF
VBAT
C1
2.2µF
ENM
ENC
C1P C1M C2P
VBAT
LTC3210
C2M
CPO
ENM
ENC
RM
MLED1
MLED2
MLED3
MLED4
CLED
RC GND
30.1k
1%
24.3k
1%
C4
2.2µF
4-LED MAIN Display
Efficiency vs VBAT Voltage
100
90
MAIN
80
CAM
70
60
50
40
30
3210 TA01
20 4 LEDs AT 9mA/LED
10 (TYP VF AT 9mA = 3V, NICHIA NSCW100)
TA = 25°C
0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
4.4
VBAT (V)
3210 TA01b
3210f
1
1 page  
LTC3210www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise stated.
CLED Pin Dropout Voltage
vs CLED Pin Current
500
VBAT = 3.6V
400
300
200
100
0
50 100 150 200 250 300 350 400
CLED PIN CURRENT (mA)
3210 G10
VBAT Shutdown Current
vs VBAT Voltage
5.0
4.5 TA = 25°C
4.0
3.5 TA = –40°C
3.0
2.5
TA = 85°C
2.0
1.5
2.7 3.0
3.3 3.6 3.9
VBAT VOLTAGE (V)
4.2 4.5
3210 G13
MLED Pin Dropout Voltage
vs MLED Pin Current
100
90 VBAT = 3.6V
80
70
60
50
40
30
20
10
0
0 2 4 6 8 10 12 14 16 18 20
MLED PIN CURRENT (mA)
3210 G11
1x Mode No Load VBAT Current
vs VBAT Voltage
800
RM = 33.2k
780 RC = 24.3k
760
740
720
700
680
660
640
620
600
2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT VOLTAGE (V)
3210 G14
Oscillator Frequency
vs VBAT Voltage
850
840 TA = 25°C
830
820
810 TA = 85°C
800
TA = –40°C
790
780
770
760
2.7 3.0 3.3 3.6 3.9
VBAT VOLTAGE (V)
4.2 4.5
3210 G12
1.5x Mode Supply Current vs ICPO
(IVBAT – 1.5ICPO)
20
VBAT = 3.6V
15
10
5
0
0 100 200 300 400 500
LOAD CURRENT (mA)
3210 G15
2x Mode Supply Current vs ICPO
(IVBAT – 2ICPO)
20
VBAT = 3.6V
15
10
5
0
0 100 200 300 400 500
LOAD CURRENT (mA)
3210 G16
CLED Pin Current
vs CLED Pin Voltage
400 VBAT = 3.6V
360
320
280
240
200
160
120
80
40
0
0 0.2 0.4 0.6 0.8 1
CLED PIN VOLTAGE (V)
3210 G17
3210f
5
5 Page 
U
OPERATIO
Thermal Protection
The LTC3210 has built-in overtemperature protection.
At internal die temperatures of around 150°C thermal
shutdown will occur. This will disable all of the current
sources and charge pump until the die has cooled by
about 15°C. This thermal cycling will continue until the
fault has been corrected.
Mode Switching
The LTC3210 will automatically switch from 1x mode
to 1.5x mode and subsequently to 2x mode whenever
LTC3210www.DataSheet4U.com
a dropout condition is detected at an LED pin. Dropout
occurs when a current source voltage becomes too low
for the programmed current to be supplied. The time
from drop-out detection to mode switching is typically
0.4ms.
The part is reset back to 1x mode when the part is shut
down (ENM = ENC = Low) or on the falling edge of ENC.
An internal comparator will not allow the main switches to
connect VBAT and CPO in 1x mode until the voltage at the
CPO pin has decayed to less than or equal to the voltage
at the VBAT pin.
3.8
VBAT = 3V
3.6
VCPO = 4.2V
C2 = C3 = C4 = 2.2µF
3.4
3.2
3.0
2.8
2.6
2.4
–40
–15 10 35 60
TEMPERATURE (˚C)
85
3210 F03
Figure 3. Typical 1.5x ROL vs Temperature
4.6
VBAT = 3V
4.4
VCPO = 4.8V
C2 = C3 = C4 = 2.2µF
4.2
4.0
3.8
3.6
3.4
3.2
–40
–15 10 35 60
TEMPERATURE (˚C)
85
3210 F04
Figure 4. Typical 2x ROL vs Temperature
3210f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC3210.PDF ] | |
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