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ACT8840 Datasheet Preview

ACT8840 Datasheet

Advanced PMU

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ACT8840
Rev 2, 29-Jan-15
Advanced PMU for Single-core Application Processors
FEATURES
INTEGRATED POWER SUPPLIES
 Four DC/DC Step-Down (Buck) Regulators
 2 x 1.8A, 2 x 1.3A
 Five Low-Noise LDOs
 2 x 150mA, 3 x 350mA
 Three Low-Input Voltage LDOs
 1 x 150mA, 2 x 350mA
 One Low IQ Keep-Alive LDO
 Backup Battery Charger
SYSTEM CONTROL AND INTERFACE
 Six General Purpose I/O with PWM Drivers
 I2C Serial Interface
 Interrupt Controller
SYSTEM MANAGEMENT
 Reset Interface and Sequencing Controller
Power on Reset
Soft / Hard Reset
Watchdog Supervision
Multiple Sleep Modes
 Thermal Management Subsystem
APPLICATIONS
 Tablet PC
 Mobile Internet Devices (MID)
 Ebooks
 Personal Navigation Devices
GENERAL DESCRIPTION
The ACT8840 is a complete, cost effective, and
highly-efficient ActivePMUTM power management
solution optimized for the power, voltage
sequencing and control requirements of general
Single-core application processor.
The ACT8840 features four fixed-frequency,
current-mode, synchronous PWM step-down
converters that achieve peak efficiencies of up to
97%. These regulators operate with a fixed
frequency of 2.25MHz, minimizing noise in sensitive
applications and allowing the use of small external
components. These buck regulators supply up to
1.8A of output current and can fully satisfy the
power and control requirements of the single-core
application processor. Dynamic Voltage Scaling
(DVS) is supported either by dedicated control pins,
or through I2C interface to optimize the energy-per-
task performance for the processor. This device
also include eight low-noise LDOs (up to 350mA
per LDO), one always-ON LDO and an integrated
backup battery charger to provide a complete
power system for the processor.
The power sequence and reset controller provides
power-on reset, SW-initiated reset, and power cycle
reset for the processor. It also features the
watchdog supervisory function. Multiple sleep
modes with autonomous sleep and wake-up
sequence control are supported.
The thermal management and protection
subsystem allows the host processor to manage the
power dissipation of the PMU and the overall
system dynamically. The PMU provides a thermal
warning to the host processor when the
temperature reaches a certain threshold such that
the system can turn off some of the non-essential
functions, reduce the clock frequency and etc to
manage the system temperature.
The ACT8840 is available in a compact, Pb-Free
and RoHS-compliant TQFN66-48 package.
Innovative PowerTM
-1-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of NXP.
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.




Active-Semi

ACT8840 Datasheet Preview

ACT8840 Datasheet

Advanced PMU

No Preview Available !

TABLE OF CONTENTS
ACT8840
Rev 2, 29-Jan-15
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 Telechips TCC88xx Processors .......................................................................p. 28
Control Signals .................................................................................................................................p. 29
Push-Button Control.........................................................................................................................p. 30
Control Sequences...........................................................................................................................p. 30
Watch-Dog Supervision ...................................................................................................................p. 30
Software-Initiated Power Cycle ........................................................................................................p. 30
Functional Description .................................................................................................................................p. 32
I2C Interface .....................................................................................................................................p. 32
Housekeeping Functions..................................................................................................................p. 32
Thermal Protection ...........................................................................................................................p. 32
Step-Down DC/DC Regulators ....................................................................................................................p. 33
General Description..........................................................................................................................p. 33
100% Duty Cycle Operation.............................................................................................................p. 33
Operating Mode................................................................................................................................p. 33
Synchronous Rectification................................................................................................................p. 33
Soft-Start ..........................................................................................................................................p. 33
Compensation ..................................................................................................................................p. 33
Configuration Options.......................................................................................................................p. 33
OK[ ] and Output Fault Interrupt.......................................................................................................p. 34
PCB Layout Considerations .............................................................................................................p. 34
Low-Noise, Low-Dropout Linear Regulators................................................................................................p. 35
General Description..........................................................................................................................p. 35
Output Current Limit .........................................................................................................................p. 35
Compensation ..................................................................................................................................p. 35
Configuration Options.......................................................................................................................p. 35
OK[ ] and Output Fault Interrupt.......................................................................................................p. 35
PCB Layout Considerations .............................................................................................................p. 35
Always-On LDO (REG13)............................................................................................................................p. 36
General Description..........................................................................................................................p. 36
Reverse-Current Protection .............................................................................................................p. 36
Typical Application ...........................................................................................................................p. 36
PWM LED Drivers........................................................................................................................................p. 37
PWM Frequence Selection ..............................................................................................................p. 37
PWM Duty Cycle Selection ..............................................................................................................p. 37
TQFN66-48 Package Outline and Dimensions ...........................................................................................p. 38
Innovative PowerTM
-2-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of NXP.
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.


Part Number ACT8840
Description Advanced PMU
Maker Active-Semi
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