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ACT8846QM490-T Datasheet(PDF) 2 Page - Active-Semi, Inc |
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ACT8846QM490-T Datasheet(HTML) 2 Page - Active-Semi, Inc |
2 / 40 page ACT8846 Rev 4, 25-May-16 Innovative PowerTM - 2 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of NXP. 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 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 I2C Interface .....................................................................................................................................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 |
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