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LTC3209-1/LTC3209-2
600mA Main/Camera
LED Controller
FEATURES
DESCRIPTIO
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Multimode Charge Pump Provides Up to 94%
Efficiency (1x, 1.5x, 2x)
Up to 600mA Total Output Current
LTC3209-1: 8 Current Sources Available as
6 × 25mA MAIN, 1 × 400mA CAM and 1 × 15mA AUX
LTC3209-2: 8 Current Sources Available as
5 × 25mA MAIN, 2 × 200mA CAM and 1 × 15mA AUX
LED On/Off and Brightness Level Programmable
Using 2-Wire I 2 C TM Interface
Automatic Charge Pump Mode Switching or Fixed
Mode for Power Supply Generation
Low Noise Constant Frequency Operation*
Internal Soft-Start Limits Inrush Current During
Start-up and Mode Switching
Short Circuit/Thermal/Open-Shorted LED Protection
256 Brightness States for MAIN Display
16 Brightness States for CAM Display
The LTC ? 3209-1/LTC3209-2 are highly integrated
multidisplay LED controllers. These parts contain a high
efficiency, low noise charge pump to provide power to
MAIN, CAM and AUX LED displays. The LTC3209-1/
LTC3209-2 require only four 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 external
resistor. Current for each LED is controlled by a precision
internal current source. Dimming and On/Off for all dis-
plays is achieved via the I 2 C serial interface. 256 states are
available for the MAIN display. Sixteen states are available
for the CAM display and four states are available for the
AUX display.
The charge pump optimizes efficiency based on the
voltage across the LED current sources. The part powers
■ 4 Brightness States for AUX Display
■ 20-Lead (4mm × 4mm) QFN Package
APPLICATIO S
■ Video/Camera Phones with QVGA+ Displays
, LT, LTC and LTM 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
LTC3209-1 6 MAIN/1 CAM Operation
up in 1x mode and will automatically switch to boost mode
whenever any enabled MAIN or CAM LED current source
begins to enter dropout. The first dropout switches the
part into 1.5x mode and a subsequent dropout switches
the part into 2x mode. The part resets to 1x mode
whenever a data bit is updated via the I 2 C port. The parts
are available in a 4mm × 4mm 20-lead QFN package.
LTC3209-2 5 MAIN/2 CAM Operation
2.2 μ F
2.2 μ F
2.2 μ F
2.2 μ F
V BAT1,2
V BAT1,2
V BAT
2.2 μ F
C1P C1M C2P C2M
CPO
2.2 μ F
MAIN
CAM
RED
V BAT
2.2 μ F
C1P C1M C2P C2M
CPO
2.2 μ F
MAIN
CAM
RED
LTC3209-1
LTC3209-2
I 2 C
SCL
SDA
MAIN1-6
6
I 2 C
SCL
SDA
MAIN1-5
5
CAM
CAM
2
LOW HI
CAMHL
R REF
AUX
GND
3209 TA01
LOW HI
CAMHL
R REF
AUX
GND
3209 TA02
24.3k
24.3k
320912fa
1
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