ACT8891 データシートの表示（PDF） - Active-Semi, Inc

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ACT8891

Advanced PMU for Rockchip RK2918 Processor

Active-Semi, Inc 

ACT8891

Rev 1, 06-Sep-13

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. 10

System Control Electrical Characteristics....................................................................................................p. 13

Step-Down DC/DC Electrical Characteristics ..............................................................................................p. 14

Low-Noise LDO Electrical Characteristics...................................................................................................p. 15

Typical Performance Characteristics...........................................................................................................p. 16

System control information ..........................................................................................................................p. 21

Interfacing with the Rockchip RK2918 .............................................................................................p. 21

Control Signals .................................................................................................................................p. 22

Push-Button Control.........................................................................................................................p. 22

Control Sequences...........................................................................................................................p. 22

Functional Description .................................................................................................................................p. 24

I2C Interface .....................................................................................................................................p. 24

Voltage Monitor and Interrupt...........................................................................................................p. 24

Thermal Shutdown ...........................................................................................................................p. 24

Step-Down DC/DC Regulators ....................................................................................................................p. 25

General Description..........................................................................................................................p. 25

100% Duty Cycle Operation.............................................................................................................p. 25

Synchronous Rectification................................................................................................................p. 25

Soft-Start ..........................................................................................................................................p. 25

Compensation ..................................................................................................................................p. 25

Configuration Options.......................................................................................................................p. 25

OK[ ] and Output Fault Interrupt.......................................................................................................p. 26

PCB Layout Considerations .............................................................................................................p. 26

Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 27

General Description..........................................................................................................................p. 27

Output Current Limit .........................................................................................................................p. 27

Compensation ..................................................................................................................................p. 27

Configuration Options.......................................................................................................................p. 27

OK[ ] and Output Fault Interrupt.......................................................................................................p. 27

PCB Layout Considerations .............................................................................................................p. 27

TQFN44-32 Package Outline and Dimensions ...........................................................................................p. 29

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