SC441D

0

Pin Descriptions

Pin #

Pin Name

Pin Function



IO2

Provides constant current source to LED string 2.

2

IO

Provides constant current source to LED string .

3

IOGND

Constant current source ground.

4

AGND

Analog ground

5

SS

Soft-start pin

6

COMP

The output of the internal trans-conductance error amplifier.

7

EN

Enable the device including regulator and LED drivers.

8

IOSET

Current source IO value set pin. By selecting the resistor connected from this pin to GND,

the corresponding maximum current on all 4 strings are set.

9

PWM

PWM dimming control pin for LED strings.

0

VOUT

Internal pull down current source in over voltage fault. Connect this pin directly to Boost output.



FFLAG

Power failure signal output with open collector. Held low under normal operation.

2

VIN

Power input voltage pin. Bypassed with capacitors close to the pin.

3

SCP_EN

O LED short-circuit protection pin – leaving this pin open enables the function, tying it to ground

disables it. If any IO pin connects to VIN, SCP_EN needs to be left open to activate the protection.

4

OVPIN

Over-Voltage Protection sense signal input.

5,8

PGND

Power ground

6,7

SW

Collector of the internal power switch.

9

IO4

Provides constant current source to LED string 4. Connect to VIN for 3 strings operation.

20

IO3

Provides constant current source to LED string 3.

EDP

Solder to the ground plane of the PCB.

EN

STATUS

0

backlight disable



backlight enable

Note: When EN = 0; the boost is turned OFF and disabled.

Note: Any unused IO pin should be pulled up to VIN.