ACT8848QM201-T データシートの表示（PDF） - Active-Semi, Inc
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ACT8848QM201-T Datasheet PDF : 37 Pages
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ACT8848
Rev 2, 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. 26
Interfacing with the Telechips TCC88xx Processors .......................................................................p. 26
Control Signals .................................................................................................................................p. 27
Push-Button Control.........................................................................................................................p. 28
Control Sequences...........................................................................................................................p. 28
Watch-Dog Supervision ...................................................................................................................p. 28
Software-Initiated Power Cycle ........................................................................................................p. 28
Functional Description .................................................................................................................................p. 30
I2C Interface .....................................................................................................................................p. 30
Housekeeping Functions..................................................................................................................p. 30
Thermal Protection ...........................................................................................................................p. 30
Step-Down DC/DC Regulators ....................................................................................................................p. 31
General Description..........................................................................................................................p. 31
100% Duty Cycle Operation.............................................................................................................p. 31
Operating Mode................................................................................................................................p. 31
Synchronous Rectification................................................................................................................p. 31
Soft-Start ..........................................................................................................................................p. 31
Compensation ..................................................................................................................................p. 31
Configuration Options.......................................................................................................................p. 31
OK[ ] and Output Fault Interrupt.......................................................................................................p. 32
PCB Layout Considerations .............................................................................................................p. 32
Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 33
General Description..........................................................................................................................p. 33
Output Current Limit .........................................................................................................................p. 33
Compensation ..................................................................................................................................p. 33
Configuration Options.......................................................................................................................p. 33
OK[ ] and Output Fault Interrupt.......................................................................................................p. 33
PCB Layout Considerations .............................................................................................................p. 33
Always-On LDO (REG13)............................................................................................................................p. 34
General Description..........................................................................................................................p. 34
Reverse-Current Protection .............................................................................................................p. 34
Typical Application ...........................................................................................................................p. 34
PWM LED Drivers........................................................................................................................................p. 35
PWM Frequency Selection...............................................................................................................p. 35
PWM Duty Cycle Selection ..............................................................................................................p. 35
TQFN66-48 Package Outline and Dimensions ...........................................................................................p. 36
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