Innovative Power
TM
- 1 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ActivePMU
TM
is a trademark of Active-Semi.
I
2
C
TM
is a trademark of NXP.
ACT8847
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
• Six General Purpose I/O with PWM Drivers
• I
2
C 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 ACT8847 is a complete, cost effective, and
highly-efficient ActivePMU
TM
power management
solution optimized for the power, voltage
sequencing and control requirements of Samsung
Exynos 4210 (S5PC210/S5PV310) and other
application processors. (Please See Ordering
Information Section and its Appendix.)
The ACT8847 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 ACT8847 is available in a compact, Pb-Free
and RoHS-compliant TQFN66-48 package.
Product Brief, 05-Dec-12
ACT8847
Product Brief, 05-Dec-12
Innovative Power
TM
- 2 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ActivePMU
TM
is a trademark of Active-Semi.
I
2
C
TM
is a trademark of NXP.
FUNCTIONAL BLOCK DIAGRAM
PRODUCT OPTIONS
Block Function Output Voltage Capability
REG1 Step-Down DC/DC 0.6V to 3.9V 1.5A
REG2 Step-Down DC/DC 0.6V to 3.9V 2.8A
REG3 Step-Down DC/DC 0.6V to 3.9V 2.8A
REG4 Low-Noise LDO 0.6V to 3.9V 1.5A
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 Input-Voltage 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