ACT8847
Rev 5, 15-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. 11
System Control Electrical Characteristics....................................................................................................p. 16
Step-Down DC/DC Electrical Characteristics..............................................................................................p. 17
Low-Noise LDO Electrical Characteristics...................................................................................................p. 18
Low-Input Voltage LDO Electrical Characteristics.......................................................................................p. 19
Low-Power (Always-On) LDO Electrical Characteristics.............................................................................p. 20
PWM LED Driver Electrical Characteristics.................................................................................................p. 20
Typical Performance Characteristics……………………………………………………………………………..p. 21
System Control Information .........................................................................................................................p. 27
Interfacing with the Samsung S5PC210/S5PV310 Processors.......................................................p. 27
Control Signals.................................................................................................................................p. 28
Push-Button Control.........................................................................................................................p. 29
Control Sequences...........................................................................................................................p. 29
Watch-Dog Supervision ...................................................................................................................p. 30
Software-Initiated Power Cycle........................................................................................................p. 30
Functional Description .................................................................................................................................p. 31
I2C Interface .....................................................................................................................................p. 31
Housekeeping Functions..................................................................................................................p. 31
Thermal Protection...........................................................................................................................p. 31
Step-Down DC/DC Regulators ....................................................................................................................p. 32
General Description..........................................................................................................................p. 32
100% Duty Cycle Operation.............................................................................................................p. 32
Operating Mode................................................................................................................................p. 32
Synchronous Rectification................................................................................................................p. 32
Soft-Start ..........................................................................................................................................p. 32
Compensation ..................................................................................................................................p. 32
Configuration Options.......................................................................................................................p. 32
OK[ ] and Output Fault Interrupt.......................................................................................................p. 33
PCB Layout Considerations.............................................................................................................p. 33
Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 34
General Description..........................................................................................................................p. 34
Output Current Limit.........................................................................................................................p. 34
Compensation ..................................................................................................................................p. 34
Configuration Options.......................................................................................................................p. 34
OK[ ] and Output Fault Interrupt.......................................................................................................p. 34
PCB Layout Considerations.............................................................................................................p. 34
Always-On LDO (REG13)............................................................................................................................p. 35
General Description..........................................................................................................................p. 35
Reverse-Current Protection .............................................................................................................p. 35
Typical Application ...........................................................................................................................p. 35
PWM LED Drivers........................................................................................................................................p. 36
PWM Frequence Selection ..............................................................................................................p. 36
PWM Duty Cycle Selection ..............................................................................................................p. 36
TQFN66-48 Package Outline and Dimensions ...........................................................................................p. 37
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