ACT8931A
Rev 3, 29-Nov-12
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
I2C Interface Electrical Characteristics ........................................................................................................p. 08
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
ActivePathTM Charger Electrical Characteristics..........................................................................................p. 18
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
I2C Interface .....................................................................................................................................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
ActivePathTM Charger ..................................................................................................................................p. 35
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
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