ACT8342

Rev0, 26-May-08

Innovative Power

TM

- 4 -

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

ActivePMU

PIN DESCRIPTIONS

PIN

NAME

DESCRIPTION

1

nIRQ

Open-Drain Push-Button Status Output. nIRQ is an open-drain output which sinks current

when nMSTR is asserted or when a fault-condition occurs. If interrupts are not masked.

2

nMSTR

Master Enable Input. Drive nMSTR to GA or to a logic low to enable the IC.

3

nRSTO

Open-Drain Reset Output. nRSTO asserts low for the reset timeout period of 300ms whenever

the IC is enabled.

4

OUT1

Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the

internal feedback network to the output voltage.

5

VP1

Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as

possible to the IC.

6

SW1

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

7

GP1

Power Ground for REG1. Connect GA, GP1 together at a single point as close to the IC as

possible.

8

OUT2

Output voltage for REG2. Capable of delivering up to 80mA of output current. Output has high

impedance when disabled.

9

INL

Power input for REG2, REG3. Bypass to GA with a high quality ceramic capacitor placed as

close as possible to the IC.

10

OUT3

Output voltage for REG3. Capable of delivering up to 150mA of output current. Output has

high impedance when disabled.

11

ON2

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

to GA or a logic low to disable REG2.

12

ON1

Enable control input for REG1. Drive ON1 to the VP1 or a logic high for normal operation, drive

to GA or a logic low to disable REG1.

13

REFBP

Reference Noise Bypass. Connect a 0.01µF ceramic capacitor from REFBP to GA. This pin is

discharged to GA in shutdown.

14, 16

GA

Analog Ground. Connect GA directly to a quiet ground node. Connect GA, GP1 together at a

single point as close to the IC as possible.

15

ON3

Enable control input for REG3. Drive ON3 to the INL or a logic high for normal operation, drive

to GA or a logic low to disable REG3.