RT8089A

2

DS8089A-01

March 2013

www.richtek.com

Copyright

2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

©

Pin No.

Pin Name

Pin Function

1

FB

Feedback Input. This pin receives the feedback voltage from a resistive

voltage divider connected across the output.

2

VCC

Supply Voltage Input. Decouple this pin to GND with at least 1

μF ceramic cap.

3

VIN

Power Input. Decouple this pin to GND with at least 10

μF ceramic cap.

4, 5,

11 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

6, 7

SW

Switch Node. Connect this pin to the inductor.

8

NC

No Internal Connection.

9

PGOOD

Power Good Indicator. This pin is an open drain logic output. The PGOOD will

be pulled to ground when the output voltage is less than 90% of the target

output voltage.

10

EN

Enable Control Input. Pull high the EN pin to turn on the converter.

Functional Pin Description

Pin Configurations

(TOP VIEW)

WDFN-10L 3x3

9

8

7

1

2

3

4

5

10

6

11

FB

GND

VIN

GND

VCC

EN

SW

PGOOD

NC

SW