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, currentmode,
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 energyper-
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.