SC4212LM

5

Pin Descriptions

Pin #

Pin Name

Pin Function

1

PG

Power good output. Open drain, active high. Connect to a positive supply with a pullup resistor.

Leave this pin unconnected if not used.

2

EN

Enable input. Driving this pin high turns on the regulator. Driving this pin low shuts off the regula-

tor. If not driven from a control circuit, tie this pin directly to the VIN pin, or via a resistor up to

400kΩ.

3

VIN

Input supply pin. A large bulk capacitance should be placed close to this pin to ensure that the

input supply does not sag below the minimum V

4

SS

Soft-start pin. Connecting a ceramic capacitor from this pin to GND sets the startup time. Refer to

the EC table (page 3) for the typical t

5

BYP

Bypass pin. Low noise performance is optimized by connecting a capacitor from this pin to GND.

6

VO

Regulator output pin. Refer to the Applications Information section for output capacitor selection.

7

FB

Input of the error amplifier. This pin is used to set the output voltage (See typical Application

Circuits on page 1).

8

GND

Ground pin.

THERMAL PAD

The exposed pad enhances thermal performance and is not electrically connected inside the pack-

age. It is recommended to connect the exposed pad to the ground plane using multiple vias.

Block Diagram

Over-current and

thermal shutdown

Circuitry

Enable

Circuitry

Reverse Polarity

Protection Circuitry

Circuitry

GND

FB

VO

VIN

EN

PG

Circuitry

EN

PG

Soft-Start

Circuitry

BYP

SS