ACT8846 查看數據表（PDF） - Active-Semi, Inc
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ACT8846 Datasheet PDF : 40 Pages
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ACT8846
Rev 4, 25-May-16
Advanced PMU for Multi-core Application Processors
FEATURES
INTEGRATED POWER SUPPLIES
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
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
Thermal Management Subsystem
APPLICATIONS
Tablet PC
Mobile Internet Devices (MID)
E-books
Personal Navigation Devices
Smart Phones
GENERAL DESCRIPTION
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
RK31x8 application processor family.
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-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 ACT8846 is available in a compact, Pb-Free
and RoHS-compliant TQFN66-48 package.
Innovative PowerTM
-1-
ActivePMUTM is a trademark of Active-Semi.
I2CTM is a trademark of NXP.
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
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