SC5010

13

Pin Descriptions (continued)

Pin #

Pin Name

Pin Function

20

IO3

Regulated current sink LED channel 3 — connect this pin to the cathode of the bottom LED in string 3.

Connect pin to ground to disable this LED string.

21

IO2

Regulated current sink LED channel 2 — connect this pin to the cathode of the bottom LED in string 2.

Connect pin to ground to disable this LED string.

22

IO1

Regulated current sink LED channel 1 — connect this pin to the cathode of the bottom LED in string 1.

Connect pin to ground to disable this LED string.

23

OVP

Over-voltage feedback pin — over-voltage activated when pin exceeds 1.2V. Use a resistor divider tied to the

output and GND to set the OVP level.

24

CS

Step-up (boost) switch current sense pin — Connect a resistor from this pin to ground for current sense - utilized

in peak current mode control loop and over-current sense circuitry.

25

PGND

Power ground — tie this pin to the power ground plane close to input and output decoupling capacitors.

26

DRVN

Gate drive for the external step-up (boost) n-channel MOSFET.

27

DRVP

Gate drive for the external p-channel MOSFET disconnect switch.

28

VIN

Connect to the input power supply — accepts 4.5V - 27V input. Usually add 4.7μF or larger ceramic bypass capaci-

tor from this pin to ground.

PAD

-

Thermal pad for heat-sinking purposes — it is also AGND and should be connected to ground plane for proper

circuit operation.