ACT8840
Rev 1, 07-Feb-14
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. 17
Step-Down DC/DC Electrical Characteristics..............................................................................................p. 18
Low-Noise LDO Electrical Characteristics...................................................................................................p. 19
Low-Input Voltage LDO Electrical Characteristics.......................................................................................p. 20
Low-Power (Always-On) LDO Electrical Characteristics.............................................................................p. 21
PWM LED Driver Electrical Characteristics.................................................................................................p. 21
Typical Performance Characteristics……………………………………………………………………………..p. 22
System Control Information .........................................................................................................................p. 28
Interfacing with the Telechips TCC88xx Processors .......................................................................p. 28
Control Signals.................................................................................................................................p. 29
Push-Button Control.........................................................................................................................p. 30
Control Sequences...........................................................................................................................p. 30
Watch-Dog Supervision ...................................................................................................................p. 30
Software-Initiated Power Cycle........................................................................................................p. 30
Functional Description .................................................................................................................................p. 32
I2C Interface .....................................................................................................................................p. 32
Housekeeping Functions..................................................................................................................p. 32
Thermal Protection...........................................................................................................................p. 32
Step-Down DC/DC Regulators ....................................................................................................................p. 33
General Description..........................................................................................................................p. 33
100% Duty Cycle Operation.............................................................................................................p. 33
Operating Mode................................................................................................................................p. 33
Synchronous Rectification................................................................................................................p. 33
Soft-Start ..........................................................................................................................................p. 33
Compensation ..................................................................................................................................p. 33
Configuration Options.......................................................................................................................p. 33
OK[ ] and Output Fault Interrupt.......................................................................................................p. 34
PCB Layout Considerations.............................................................................................................p. 34
Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 35
General Description..........................................................................................................................p. 35
Output Current Limit.........................................................................................................................p. 35
Compensation ..................................................................................................................................p. 35
Configuration Options.......................................................................................................................p. 35
OK[ ] and Output Fault Interrupt.......................................................................................................p. 35
PCB Layout Considerations.............................................................................................................p. 35
Always-On LDO (REG13)............................................................................................................................p. 36
General Description..........................................................................................................................p. 36
Reverse-Current Protection .............................................................................................................p. 36
Typical Application ...........................................................................................................................p. 36
PWM LED Drivers........................................................................................................................................p. 37
PWM Frequence Selection ..............................................................................................................p. 37
PWM Duty Cycle Selection ..............................................................................................................p. 37
TQFN66-48 Package Outline and Dimensions ...........................................................................................p. 38
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