LTC3206EUF Linear Technology, LTC3206EUF Datasheet - Page 6

• Manufacturer Part Number: LTC3206EUF
• Description: IC LED DRVR WT/RGB BCKLGT 24-QFN
• Manufacturer: Linear Technology
• Type: Backlight, White LED, RGB (I²C Interface)r

Specifications of LTC3206EUF

• Topology: PWM, Step-Up (Boost), Switched Capacitor (Charge Pump)
• Number Of Outputs: 11
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: RGB, White LED
• Frequency: 680kHz ~ 1.36MHz
• Voltage - Supply: 2.7 V ~ 4.5 V
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 400mA
• Internal Switch(s): Yes
• Efficiency: 92%
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -

BLOCK DIAGRA
OPERATIO
LTC3206
6
Power Management
To optimize efficiency, the power management section of
the LTC3206 provides two methods of supplying power to
the CPO pin: 1x direct connect mode or 1.5x boost mode.
When any display of the LTC3206 is enabled, the power
management system connects the CPO pin directly to V
with a low impedance switch. If the voltage supplied at V
is high enough to power all of the LEDs with the pro-
grammed current, the system will remain in this “direct
connect” mode providing maximum efficiency. Internal
ENRGB/S 10
U
SGND 13
DV
I
SDA 8
SCL 9
RGB
V
I
MS
CC
IN
15
11
12
7
W
STOP
CONTROL
LOGIC
4
COMMAND LATCH
I
2
C SERIAL PORT
–
+
+
–
+
–
4
OSCILLATOR
24
960kHz
4
PWM
ENABLECP
4
IN
IN
4
C1
5
1x AND 1.5x CHARGE PUMP
+
2
circuits monitor all current sources for the onset of “drop-
out,” the point at which the current sources can no longer
supply programmed current. As the battery voltage falls,
the LED with the largest forward voltage will reach the drop-
out threshold first. When any of the LED pins reach the drop-
out threshold, the LTC3206 will switch to boost mode and
automatically soft-start the 1.5x boost charge pump. The
constant frequency charge pump is designed to minimize
the amount of noise generated at the V
2
C1
4
–
2
C2
6
+
C2
3
–
3206 BD
25
14
22 MAIN1
21 MAIN2
20 MAIN3
19 MAIN4
23 AUX1
24 AUX2
16 RED
17 GREEN
18 BLUE
1 SUB1
2 SUB2
PGND
CPO
IN
supply.
3206f