ACT8846

Rev 4, 25-May-16

- 2 -

www.active-semi.com

Copyright © 2016 Active-Semi, Inc.

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

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 Rockchip RK31x8 Processors ..........................................................................p. 28

Control Signals.................................................................................................................................p. 29

Push-Button Control.........................................................................................................................p. 30

Control Sequences...........................................................................................................................p. 30

Watch-Dog Supervision ...................................................................................................................p. 31

Software-Initiated Power Cycle ........................................................................................................p. 31

Functional Description .................................................................................................................................p. 33

Housekeeping Functions..................................................................................................................p. 33

Thermal Protection...........................................................................................................................p. 33

Step-Down DC/DC Regulators ....................................................................................................................p. 34

General Description..........................................................................................................................p. 34

100% Duty Cycle Operation.............................................................................................................p. 34

Operating Mode................................................................................................................................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

Always-On LDO (REG13)............................................................................................................................p. 37

General Description..........................................................................................................................p. 37

Reverse-Current Protection .............................................................................................................p. 37

Typical Application ...........................................................................................................................p. 37

PWM LED Drivers........................................................................................................................................p. 38

PWM Frequence Selection ..............................................................................................................p. 38

PWM Duty Cycle Selection ..............................................................................................................p. 38

TQFN66-48 Package Outline and Dimensions ...........................................................................................p. 39

Revision History...........................................................................................................................................p. 40