ACT8325

Rev0, 13-May-08

Active-Semi

Innovative Power

TM

- 4 -

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

ActivePMU

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

VP1

Power Input for REG1. Bypass to GP12 with a high quality ceramic capacitor placed as close as

possible to the IC.

2

SW1

Switching Node Output for REG1. Connect this pin to the switching end of the inductor.

3

GP12

Power Ground for REG1, REG2. Connect GA and GP12 together at single point as close to the

IC as possible.

4

SW2

Switching Node Output for REG2. Connect this pin to the switching end of the inductor.

5

VP2

Power Input for REG2. Bypass to GP12 with a high quality ceramic capacitor placed as close as

possible to the IC.

6

FB2

Feedback Node for REG2. For fixed output voltage options, connect this pin directly to the out-

put. For the adjustable output voltage options the voltage at this pin is regulated to 0.625V, con-

nect this pin to the center of the output feedback resistor divider for voltage setting.

7

GA

Analog Ground. Connect GA directly to a quiet ground node. Connect GA and GP12 together at

a single point as close to the IC as possible.

8

ON1

Enable Control Input for REG1. Drive ON1 to VP1 or to a logic high for normal operation, drive to

GA or to a logic low to disable REG1.

9

ON2

Enable Control Input for REG2. Drive ON2 to VP1or to a logic high for normal operation, drive to

GA or to a logic low to disable REG2.

10

FB1

Feedback Node for REG1. For fixed output voltage options, connect this pin directly to the out-

put. For the adjustable output voltage options the voltage at this pin is regulated to 0.625V, con-

nect this pin to the center of the output feedback resistor divider for voltage setting.

EP

EP

Exposed Pad. Must be soldered to ground on PCB.