ACT8931AQJ633-T

ACT8931A Rev 3, 29-Nov-12 Advanced PMU for Rockchip RK2928/RK2926 Processors Rockchip RK2928/RK2926 processors. It is ideal for a FEATURES wide range of high performance portable handheld applications such as tablet or pad devices. This device Three Step-Down DC/DC Converters TM integrates the ActivePath complete battery charging Four Low-Dropout Linear Regulators and management system with seven power supply TM Integrated ActivePath Charger channels. 2 TM I C Serial Interface This device features three step-down DC/DC converters and four low-noise, low-dropout linear Advanced Enable/Disable Sequencing Controller regulators, along with a complete battery charging Minimal External Components TM solution featuring the advanced ActivePath Tiny 55mm TQFN55-40 Package system-power selection function. 0.75mm Package Height The three DC/DC converters utilize a high- Pb-Free and RoHS Compliant efficiency, fixed-frequency (2MHz), current-mode PWM control architecture that requires a minimum number of external components. Two DC/DCs are capable of supplying up to 1100mA of output current, while the third supports up to 1200mA. All four low-dropout linear regulators are high- performance, low-noise regulators that supply up to GENERAL DESCRIPTION 320mA of output current. The ACT8931A is a complete, cost effective, highly- The ACT8931A is available in a compact, Pb-Free TM efficient ActivePMU power management solution, and RoHS-compliant TQFN55-40 package. optimized for the unique power, voltage- sequencing, and control requirements of the TYPICAL APPLICATION DIAGRAM TM Innovative Power - 1 - www.active-semi.com TM TM ActivePMU and ActivePath are trademarks of Active-Semi. 2 TM I C is a trademark of NXP. Copyright 2012 Active-Semi, Inc. ACT8931A Rev 3, 29-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 2 I C Interface Electrical Characteristics ........................................................................................................ p. 08 Global Register Map .................................................................................................................................... p. 09 Register and Bit Descriptions ...................................................................................................................... p. 10 System Control Electrical Characteristics .................................................................................................... p. 15 Step-Down DC/DC Electrical Characteristics .............................................................................................. p. 16 Low-Noise LDO Electrical Characteristics ................................................................................................... p. 17 TM ActivePath Charger Electrical Characteristics .......................................................................................... p. 18 Typical Performance Characteristics ........................................................................................................... p. 20 System control information .......................................................................................................................... p. 26 Control Signals ................................................................................................................................. p. 27 Push-Button Control ......................................................................................................................... p. 27 Control Sequences ........................................................................................................................... p. 28 Functional Description ................................................................................................................................. p. 29 2 I C Interface ..................................................................................................................................... p. 29 Voltage Monitor and Interrupt ........................................................................................................... p. 29 Thermal Shutdown ........................................................................................................................... p. 30 Step-Down DC/DC Regulators .................................................................................................................... p. 31 General Description .......................................................................................................................... p. 31 100% Duty Cycle Operation ............................................................................................................. 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 TM ActivePath Charger .................................................................................................................................. p. 35 General Description .......................................................................................................................... p. 35 ActivePath Architecture .................................................................................................................... p. 35 System Configuration Optimization .................................................................................................. p. 35 Input Protection ................................................................................................................................ p. 35 Battery Management ........................................................................................................................ p. 35 Charge Current Programming .......................................................................................................... p. 36 Charger Input Interrupts ................................................................................................................... p. 36 Charge-Control State Machine ......................................................................................................... p. 38 State Machine Interrupts .................................................................................................................. p. 38 Thermal Regulation .......................................................................................................................... p. 39 Charge Safety Timers ...................................................................................................................... p. 39 Charger Timer Interrupts .................................................................................................................. p. 39 Charge Status Indicator.................................................................................................................... p. 39 Reverse-Current Protection ............................................................................................................. p. 39 Battery Temperature Monitoring ...................................................................................................... p. 39 Battery Temperature Interrupts ........................................................................................................ p. 40 TQFN55-40 Package Outline and Dimensions ........................................................................................... p. 41 Revision History ........................................................................................................................................... p. 42 TM Innovative Power - 2 - www.active-semi.com TM TM ActivePMU and ActivePath are trademarks of Active-Semi. 2 TM I C is a trademark of NXP. Copyright 2012 Active-Semi, Inc.