ACT8937A
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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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 S5PV210 ..........................................................................................p. 27
Control Signals ................................................................................................................................. p. 28
Push-Button Control ......................................................................................................................... p. 29
Control Sequences ........................................................................................................................... p. 29
Functional Description ................................................................................................................................. p. 33
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C Interface ..................................................................................................................................... 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
TM
Charger .................................................................................................................................. p. 39
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
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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