ACT8931A

Rev 3, 29-Nov-12

Copyright © 2012 Active-Semi, Inc.

Innovative Power

TM

ActivePMU

I

- 2 -

www.active-semi.com

TABLE OF CONTENTS

General Information .....................................................................................................................................p. 01

Functional Block Diagram............................................................................................................................p. 03

Ordering Information....................................................................................................................................p. 04

Pin Configuration .........................................................................................................................................p. 04

Pin Descriptions...........................................................................................................................................p. 05

Absolute Maximum Ratings .........................................................................................................................p. 07

Global Register Map ....................................................................................................................................p. 09

Register and Bit Descriptions ......................................................................................................................p. 10

System Control Electrical Characteristics....................................................................................................p. 15

Step-Down DC/DC Electrical Characteristics ..............................................................................................p. 16

Low-Noise LDO Electrical Characteristics...................................................................................................p. 17

ActivePath

Typical Performance Characteristics...........................................................................................................p. 20

System control information ..........................................................................................................................p. 26

Control Signals.................................................................................................................................p. 27

Push-Button Control.........................................................................................................................p. 27

Control Sequences...........................................................................................................................p. 28

Functional Description .................................................................................................................................p. 29

Voltage Monitor and Interrupt...........................................................................................................p. 29

Thermal Shutdown ...........................................................................................................................p. 30

Step-Down DC/DC Regulators ....................................................................................................................p. 31

General Description..........................................................................................................................p. 31

100% Duty Cycle Operation.............................................................................................................p. 31

Synchronous Rectification................................................................................................................p. 31

Soft-Start ..........................................................................................................................................p. 31

Compensation ..................................................................................................................................p. 31

Configuration Options.......................................................................................................................p. 31

OK[ ] and Output Fault Interrupt.......................................................................................................p. 32

PCB Layout Considerations .............................................................................................................p. 32

Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 33

General Description..........................................................................................................................p. 33

Output Current Limit .........................................................................................................................p. 33

Compensation ..................................................................................................................................p. 33

Configuration Options.......................................................................................................................p. 33

OK[ ] and Output Fault Interrupt.......................................................................................................p. 33

PCB Layout Considerations .............................................................................................................p. 33

ActivePath

General Description..........................................................................................................................p. 35

ActivePath

Architecture....................................................................................................................p. 35

System Configuration Optimization..................................................................................................p. 35

Input Protection ................................................................................................................................p. 35

Battery Management ........................................................................................................................p. 35

Charge Current Programming..........................................................................................................p. 36

Charger Input Interrupts ...................................................................................................................p. 36

Charge-Control State Machine.........................................................................................................p. 38

State Machine Interrupts ..................................................................................................................p. 38

Thermal Regulation ..........................................................................................................................p. 39

Charge Safety Timers ......................................................................................................................p. 39

Charger Timer Interrupts..................................................................................................................p. 39

Charge Status Indicator....................................................................................................................p. 39

Reverse-Current Protection .............................................................................................................p. 39

Battery Temperature Monitoring ......................................................................................................p. 39

Battery Temperature Interrupts ........................................................................................................p. 40

TQFN55-40 Package Outline and Dimensions ...........................................................................................p. 41

Revision History...........................................................................................................................................p. 42