FAC2786FE

2015.01. 26

2/13

Revision No : 0

Pin Description

Pin Number

Pin Name

Description

1

BS

High-Side Gate Drive Boost Input. BS supplies the voltage to drive the high-side

N-channel MOSFET. At least 10nF capacitor should be connected from SW to BS to

supply the high side switch.

2

VIN

Power Input. VIN supplies the power (4.5V to 30V) to the control circuitry, gate drivers

and step-down converter switches. Connecting a ceramic bypass capacitor and a

suitably large capacitor between VIN and GND eliminates switching noise and voltage

ripple on the input to the IC.

3

SW

Power Switching Output. SW is the Drain of the N-Channel power MOSFET to supply

power to the output LC filter.

4

GND

Ground.

5

FB

Output feedback Input. The FAC2786 senses the feedback voltage via FB and regulates

the voltage at 0.92V. Connecting FB with a resistor-divider from the converter’s output

sets the output voltage from 0.92V to 28V.

6

COMP

Output of the error amplifier. 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. Pull up with 100k

resistor for automatic startup.

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 0.1

µF capacitor sets the soft-start period to

15ms. To disable the soft-start feature, leave SS unconnected.

Ordering Information

FAC2786

Circuit Type

FE

Package: SOP-8E