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LTC3208
High Current Software
Con?gurable Multidisplay
LED Controller
FEATURES
DESCRIPTIO
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1x/1.5x/2x Charge Pump Provides Up to 95%
Ef?ciency
Up to 1A Total Output Current
17 Current Sources Available as MAIN, SUB, RGB,
CAM and AUX LED Drivers
LED ON/OFF, Brightness Level and Display
Con?guration Programmable Using 2-Wire I 2 C?
Interface
Low Noise Constant Frequency Operation with Flying
Capacitor Edge Rate Control
Automatic Charge Pump Mode Switching
Internal Soft-Start Limits Inrush Current During
Startup and Mode Switching
Open/Shorted LED Protection
Short-Circuit/Thermal Protection
256 Brightness States for MAIN and SUB Displays
4096 Color Combinations for the RGB Display
5mm × 5mm 32-Lead QFN Plastic Package
The LTC ? 3208 is a highly integrated multidisplay LED
controller. The part contains a 1A high ef?ciency, low noise
charge pump to provide power to the MAIN, SUB, RGB, CAM
and AUX LED displays. The LTC3208 requires only small
ceramic capacitors and one current set resistor to form a
complete LED power supply and current controller.
The maximum display currents are set by a single ex-
ternal resistor. Current for each LED is controlled by a
precision internal current source. Dimming and On/Off
for all displays is achieved via the I 2 C serial interface.
256 brightness levels are available for the MAIN and SUB
displays. 16 levels are available for the RGB and CAM
displays. Four AUX current sources can be independently
assigned via the I 2 C port to the CAM, SUB, MAIN or AUX
DAC controlled displays.
The LTC3208 charge pump optimizes ef?ciency based
on the voltage across the LED current sources. The part
powers up in 1x mode and will automatically switch to
Video/Camera Phones with QVGA + Displays
APPLICATIO  S
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, 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.
TYPICAL APPLICATIO
boost mode whenever any enabled LED current source
begins to enter dropout. The ?rst dropout switches the
part into 1.5x mode and a subsequent dropout switches
the LTC3208 into 2x mode. The part is available in a small
5mm × 5mm 32-lead QFN package.
C2
2.2 F
C3
2.2 F
100
90
4-LED MAIN Display
Ef?ciency vs Input Voltage
V BAT
C1
4.7 F
C1P C1M C2P C2M
CPO
V BAT1,2,3
C4
4.7 F
MAIN
SUB
CAMERA
RGB
AUX
80
70
60
50
I 2 C
ENABLE DISABLE
LOW HI
R REF GND
LTC3208
MAIN1-4
SCL/SDA SUB1-2
CAM1-4
ENRGBS RGB
CAMHL AUX1-4
4
2
4
3
4
3208 TA01a
40
30
20 4 LEDs AT 15mA/LED
10 (TYP V F AT 15mA = 3.2V)
T A = 25 ° C
0
3.0 3.2 3.4 3.6 3.8
V BAT (V)
4.0
4.2
4.4
24.3k
3208 TA01b
1%
3208fa
1
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