SC410

10

Pin Descriptions

Pin #

Pin Name

Pin Function

1

BST

Bootstrap pin — A capacitor is connected between BST to LX to develop the floating voltage for the

high-side gate drive.

2

VIN

Power input supply voltage

3

LX

Switching (phase) node

4

PGND

Power ground

5

PGOOD

Open-drain power good indicator — High impedance indicates power is good. An external pull-up

resistor is required.

6FB

Feedback input for switching regulator — Connect to an external resistor divider from the output to pro-

gram the output voltage.

7EN

Enable input for switching regulator —Pull EN high to enable the part with ultrasonic power save mode en-

abled. Connect to AGND to disable the switching regulator. A voltage divider can be added between VIN and

AGND pins for input UVLO functionality.

8

TON

On-time set input — Set the on-time by connecting a series resistor to AGND.

9

AGND

Analog Ground.

10

LDO

Output for the internal LDO and internal connection to the bias node — Decoupling capacitors are required

to AGND and PGND regardless of the use of the LDO for external loads.

PAD

Thermal pad for heatsinking purposes. (Not connected internally) Connect to AGND plane using multiple

vias.