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PDF LTC3209-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3209-1 | |
| Descripción | 600mA Main/Camera LED Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 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
www■.DLatEaDShOeent/4OUf.fcoamnd Brightness Level Programmable
Using 2-Wire I2CTM 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
■ 4 Brightness States for AUX Display
■ 20-Lead (4mm × 4mm) QFN Package
U
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
LTC3209-1/LTC3209-2
600mA Main/Camera
LED Controller
DESCRIPTIO
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 I2C 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
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 I2C port. The parts
are available in a 4mm × 4mm 20-lead QFN package.
TYPICAL APPLICATIO
LTC3209-1 6 MAIN/1 CAM Operation
LTC3209-2 5 MAIN/2 CAM Operation
2.2µF 2.2µF
2.2µF 2.2µF
VBAT
2.2µF
C1P C1M C2P C2M 2.2µF
VBAT1,2
CPO
I2C
LOW HI
LTC3209-1
SCL
SDA
CAMHL
RREF
6
MAIN1-6
CAM
AUX
GND
24.3k
MAIN
CAM
RED
3209 TA01
VBAT
2.2µF
C1P C1M C2P C2M 2.2µF
VBAT1,2
CPO
LTC3209-2
SCL
I2C
SDA
LOW HI
CAMHL
RREF
24.3k
5
MAIN1-5
2
CAM
AUX
GND
MAIN
CAM
RED
3209 TA02
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1 page  
LTC3209-1/LTC3209-2
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2VBAT–VCPO)/ICPO
3.8
VBAT = 3V
VCPO = 4.8V
3.6 C2 = C3 = C4 = 2.2µF
3.4
3.2
3.0
www.DataSheet4U.com
2.8
2.6
–40
–15 10 35 60
TEMPERATURE (°C)
85
3209 G08
VBAT Shutdown Current
vs VBAT Voltage
5.5
DVCC = 3V
5.0
4.5
TA = 85°C
4.0
3.5
TA = 25°C
3.0
TA = –40°C
2.5
2.0
1.5
2.7
3
3.3 3.6 3.9
VBAT VOLTAGE (V)
4.2 4.5
3209 G12
2x Mode Supply Current
vs ICPO (IVBAT–2ICPO)
25
VBAT = 3.6V
20
15
10
5
0
0 100 200 300 400 500
LOAD CURRENT (mA)
3209 G15
2x Mode CPO Voltage
vs Load Current
5.2
C2 = C3 = C4 = 2.2µF
5.1
5.0
3.4V
3.5V
4.9
4.8
3.3V
4.7
3.2V
4.6
3.1V
4.5
VBAT = 3V
4.4
4.3
4.2
0
100 200 300 400
LOAD CURRENT (mA)
500
3209 G09
1x Mode No Load VBAT Current
vs VBAT Voltage
400
380
360
340
320
300
280
260
240
220
200
2.7 3.0 3.3 3.6 3.9 4.2 4.5
VBAT VOLTAGE (V)
3209 G13
LTC3209-1 CAM Pin Current
vs CAM Pin Voltage
400
VBAT = 3.6V
300
200
100
0
0 0.2 0.4 0.6 0.8 1.0
CAM PIN VOLTAGE (V)
3209 G22
DVCC Shutdown Current
vs DVCC Voltage
0.7
VBAT = 3.6V
0.6
TA = –40°C
0.5
TA = 85°C
0.4
0.3
TA = 25°C
0.2
0.1
0
2.7 3
3.3 3.6 3.9
DVCC VOLTAGE (V)
4.2 4.5
3209 G11
1.5x Mode Supply Current
vs ICPO (IVBAT–1.5ICPO)
30
VBAT = 3.6V
20
10
0
0 100 200 300 400 500
LOAD CURRENT (mA)
3209 G14
LTC3209-1 CAM Pin Current
vs Input Code
400
VBAT = 3.6V
360
320
280
240
200
160
120
80
40
0
0123456789ABCDE F
HEX CODE
3209 G23
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5 Page 
LTC3209-1/LTC3209-2
OPERATIO
Serial Port
The microcontroller compatible I2C serial port provides all
of the command and control inputs for the LTC3209-1/
LTC3209-2. Data on the SDA input is loaded on the rising
edge of SCL. D7 is loaded first and D0 last. There are three
data registers and one address register. Once all address
bits have been clocked into the address register acknowl-
edge occurs. After the data registers have been written a
load pulse is created after the stop bit. The load pulse
wwwtr.DaantsafSehreseatl4lUo.fctohme data held in the data registers to the DAC
registers. At this point the LED current will be changed to
the new settings. The serial port uses static logic registers
so there is no minimum speed at which it can be operated.
MAIN Current Sources
LTC3209-1
There are six MAIN current sources. These current sources
have an 8-bit linear DAC for current control. For RREF =
24.3k, the output current range is 0mA to 28mA in 256
steps.
The current sources are disabled when a block receives an
all zero data word. The supply current for that block is
reduced to zero. In addition unused LED outputs can be
connected to CPO to turn off the current source output and
reduce the operating current to typically 10µA.
LTC3209-2
There are five MAIN current sources. These current sources
have an 8-bit linear DAC for current control. For RREF =
24.3k, the output current range is 0mA to 28mA in 256
steps.
The current sources are disabled when a block receives an
all zero data word. The supply current for that block is
reduced to zero. In addition unused LED outputs can be
connected to CPO to turn off the current source output and
reduce the operating current to typically 10µA.
Camera Current Sources
LTC3209-1
There is one CAM current source. This current source has
a 4-bit linear DAC for current control. The output current
range is 0mA to 400mA in 16 steps (RREF = 24.3k).
The current source is disabled when the block receives an
all zero data word. The supply current for the block is
reduced to zero. In addition, the LED output can be
connected to CPO to turn off the current source output and
reduce operating current to typically 10µA. This pin cannot
be allowed to float if unused since dropout will be errone-
ously detected.
LTC3209-2
There are two CAM current sources. These current sources
have a 4-bit linear DAC for current control. The output
current range of each current source is 0mA to 200mA in
16 steps (RREF = 24.3k).
The current sources are disabled when the block receives
an all zero data word. The supply current for the block is
reduced to zero. In addition unused LED outputs can be
connected to CPO to turn off the current source output and
reduce the operating current to typically 10µA. These pins
cannot be allowed to float if unused since dropout will be
erroneously detected.
Auxiliary Current Source
There is one AUX current source. This current source has
a 2-bit Linear DAC for current control. The output current
range is 0mA to 13.75mA in 4 steps (OFF, 33%, 67%,
100%). The AUX output does not have dropout detection
and cannot be disabled when connected to CPO.
The current source is disabled when the block receives an
all zero data word and the supply current for the block is
reduced to zero. This output can also be used as an I2C
controlled digital open-drain general purpose output.
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC3209-1.PDF ] | |
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