ACTIVE-SEMI ACT8846 Advanced pmu for multi-core application processor Datasheet

ACT8846
Product Brief, 22-Oct-12
Advanced PMU for Multi-core Application Processors
FEATURES
GENERAL DESCRIPTION
INTEGRATED POWER SUPPLIES
The ACT8846 is a complete, cost effective, and
highly-efficient ActivePMUTM power management
solution optimized for the power, voltage
sequencing and control requirements of Rockchip
RK3066 application processor family.
• Four DC/DC Step-Down (Buck) Regulators
− 2 x 2.8A, 2 x 1.5A
• Five Low-Noise LDOs
− 2 x 150mA, 3 x 350mA
The ACT8846 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
2.8A of output current and can fully satisfy the
power and control requirements of the multi-core
application processor. Dynamic Voltage Scaling
(DVS) is supported either by dedicated control pins,
or through I2C interface to optimize the energy-pertask 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.
• Three Low-Input Voltage LDOs
− 1 x 150mA, 2 x 350mA
• One Low IQ Keep-Alive LDO
• Backup Battery Charger
SYSTEM CONTROL AND INTERFACE
• Four 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
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.
• Thermal Management Subsystem
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.
APPLICATIONS
•
•
•
•
•
Tablet PC
Mobile Internet Devices (MID)
E-books
Personal Navigation Devices
Smart Phones
The ACT8846 is available in a compact, Pb-Free
and RoHS-compliant TQFN66-48 package.
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of NXP.
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT8846
Product Brief, 22-Oct-12
PRODUCT OPTIONS
Block
Function
Output Voltage
Capability
REG1
Step-Down DC/DC
0.6V to 3.9V
1500mA
REG2
Step-Down DC/DC
0.6V to 3.9V
2800mA
REG3
Step-Down DC/DC
0.6V to 3.9V
2800mA
REG4
Step-Down DC/DC
0.6V to 3.9V
1500mA
REG5
Low-Noise LDO
0.6V to 3.9V
150mA
REG6
Low-Noise LDO
0.6V to 3.9V
150mA
REG7
Low-Noise LDO
0.6V to 3.9V
350mA
REG8
Low-Noise LDO
0.6V to 3.9V
350mA
REG9
Low-Noise LDO
0.6V to 3.9V
350mA
REG10
Low Input-Voltage LDO
0.6V to 3.9V
150mA
REG11
Low Input-Voltage LDO
0.6V to 3.9V
350mA
REG12
Low Input-Voltage LDO
0.6V to 3.9V
350mA
REG13
Always-ON LDO
0.6V to 3.9V
50mA
FUNCTIONAL BLOCK DIAGRAM
Innovative PowerTM
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of NXP.
-2-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
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