ACT8934A
Rev 1, 22-Oct-12
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
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2
C 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
ActivePath
TM
Charger Electrical Characteristics.......................................................................................... p. 18
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
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C Interface ..................................................................................................................................... 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
TM
Charger .................................................................................................................................. p. 38
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
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
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2
C
TM
is a trademark of NXP.
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