LTC3206EUF datasheet(6/16 Pages) LINER

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LTC3206

3206f

BLOCK DIAGRA

–

IMS

VIN

960kHz

OSCILLATOR

1x AND 1.5x CHARGE PUMP

–

IRGB 12

SGND 13

DVCC 7

ENRGB/S 10

SCL

SDA

19 MAIN4

20 MAIN3

24 AUX2

23 AUX1

2 SUB2

1 SUB1

21 MAIN2

18 BLUE

3206 BD

17 GREEN

16 RED

22 MAIN1

CONTROL

LOGIC

PWM

COMMAND LATCH

I2C SERIAL PORT

–

C1+

C1–

C2+

C2–

PGND

CPO

ENABLECP

STOP

OPERATIO

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 VIN

with a low impedance switch. If the voltage supplied at VIN

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

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 VIN supply.

LTC3206EUF Datasheet(PDF) 6 Page - Linear Technology

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