ACT8937A

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 S5PV210 ..........................................................................................p. 27

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

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

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

Functional Description .................................................................................................................................p. 33

Voltage Monitor and Interrupt...........................................................................................................p. 33

Thermal Shutdown ...........................................................................................................................p. 34

Step-Down DC/DC Regulators ....................................................................................................................p. 35

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

100% Duty Cycle Operation.............................................................................................................p. 35

Synchronous Rectification................................................................................................................p. 35

Soft-Start ..........................................................................................................................................p. 35

Compensation ..................................................................................................................................p. 35

Configuration Options.......................................................................................................................p. 35

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

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

Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 37

General Description..........................................................................................................................p. 37

Output Current Limit .........................................................................................................................p. 37

Compensation ..................................................................................................................................p. 37

Configuration Options.......................................................................................................................p. 37

OK[ ] and Output Fault Interrupt.......................................................................................................p. 37

PCB Layout Considerations .............................................................................................................p. 37

ActivePath

General Description..........................................................................................................................p. 39

ActivePath

Architecture....................................................................................................................p. 39

System Configuration Optimization..................................................................................................p. 39

Input Protection ................................................................................................................................p. 39

Battery Management ........................................................................................................................p. 39

Charge Current Programming..........................................................................................................p. 40

Charger Input Interrupts ...................................................................................................................p. 40

Charge-Control State Machine.........................................................................................................p. 42

State Machine Interrupts ..................................................................................................................p. 42

Thermal Regulation ..........................................................................................................................p. 43

Charge Safety Timers ......................................................................................................................p. 43

Charger Timer Interrupts..................................................................................................................p. 43

Charge Status Indicator....................................................................................................................p. 43

Reverse-Current Protection .............................................................................................................p. 43

Battery Temperature Monitoring ......................................................................................................p. 43

Battery Temperature Interrupts ........................................................................................................p. 44

TQFN55-40 Package Outline and Dimensions ...........................................................................................p. 45