ACT8934A

Rev 1, 22-Oct-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. 27

Interfacing with the Samsung S3C2416/S3C2450...........................................................................p. 27

Control Signals.................................................................................................................................p. 28

Push-Button Control.........................................................................................................................p. 29

Control Sequences...........................................................................................................................p. 29

Functional Description .................................................................................................................................p. 32

Voltage Monitor and Interrupt...........................................................................................................p. 32

Thermal Shutdown ...........................................................................................................................p. 33

Step-Down DC/DC Regulators ....................................................................................................................p. 34

General Description..........................................................................................................................p. 34

100% Duty Cycle Operation.............................................................................................................p. 34

Synchronous Rectification................................................................................................................p. 34

Soft-Start ..........................................................................................................................................p. 34

Compensation ..................................................................................................................................p. 34

Configuration Options.......................................................................................................................p. 34

OK[ ] and Output Fault Interrupt.......................................................................................................p. 35

PCB Layout Considerations .............................................................................................................p. 35

Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 36

General Description..........................................................................................................................p. 36

Output Current Limit .........................................................................................................................p. 36

Compensation ..................................................................................................................................p. 36

Configuration Options.......................................................................................................................p. 36

OK[ ] and Output Fault Interrupt.......................................................................................................p. 36

PCB Layout Considerations .............................................................................................................p. 36

ActivePath

General Description..........................................................................................................................p. 38

ActivePath

Architecture....................................................................................................................p. 38

System Configuration Optimization..................................................................................................p. 38

Input Protection ................................................................................................................................p. 38

Battery Management ........................................................................................................................p. 38

Charge Current Programming..........................................................................................................p. 39

Charger Input Interrupts ...................................................................................................................p. 39

Charge-Control State Machine.........................................................................................................p. 41

State Machine Interrupts ..................................................................................................................p. 41

Thermal Regulation ..........................................................................................................................p. 42

Charge Safety Timers ......................................................................................................................p. 42

Charger Timer Interrupts..................................................................................................................p. 42

Charge Status Indicator....................................................................................................................p. 42

Reverse-Current Protection .............................................................................................................p. 42

Battery Temperature Monitoring ......................................................................................................p. 42

Battery Temperature Interrupts ........................................................................................................p. 43

TQFN55-40 Package Outline and Dimensions ...........................................................................................p. 44

Revision History...........................................................................................................................................p. 45