SGM6132

3A, 28.5V, 1.4MHz Step-Down Converter

3

SG Micro Corp

www.sg-micro.com

3

1

2

SOIC-8 (Exposed Pad)

GND

BS

SW

4

6

8

7

5

IN

FB

SS

COMP

EN

PIN DESCRIPTION

PIN

NAME

FUNCTION

1

BS

High-side Gate Drive Boost Input. BS supplies the driver for the high-side N-Channel MOSFET

switch. Connect a 10nF or greater capacitor from SW to BS to power the high-side switch. A 10Ω

resistor placed between SW and BS cap is strongly recommended to reduce SW spike voltage.

2

IN

Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive

IN with a 4.5V to 28.5V power source. Bypass IN to GND with a sufficiently large capacitor to

eliminate noise on the input to the IC.

3

SW

Power Switching Output. SW is the switching node that supplies power to the output. Connect

the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS

to power the high-side switch.

4

GND

Ground. (Connect the exposed pad on backside to pin 4.)

5

FB

Feedback Input. The voltage at this pin is regulated to 0.8V. Connected to the resistor divider

between output and ground to set output voltage.

6

COMP

Compensation Node. COMP is used to compensate the regulation control loop. Connect a

series RC network from COMP to GND to compensate the regulation control loop. In some

cases, an additional capacitor from COMP to GND is required.

7

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the

regulator, and drive EN low to turn it off. Output voltage is discharged when the IC is off. For

automatic startup, leave EN unconnected.

8

SS

Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND

to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 10ms. To disable the

soft-start feature, leave SS unconnected.

Exposed

Pad

GND

Power Ground Exposed Pad. Must be connected to GND plane.