Innovative Power

TM

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Copyright © 2012 Active-Semi, Inc.

ActivePMU

I

ACT8846

Advanced PMU for Multi-core Application Processors

FEATURES

INTEGRATED POWER SUPPLIES

− 2 x 2.8A, 2 x 1.5A

− 2 x 150mA, 3 x 350mA

− 1 x 150mA, 2 x 350mA

SYSTEM CONTROL AND INTERFACE

SYSTEM MANAGEMENT

− Power on Reset

− Soft / Hard Reset

− Watchdog Supervision

− Multiple Sleep Modes

APPLICATIONS

GENERAL DESCRIPTION

The ACT8846 is a complete, cost effective, and

highly-efficient ActivePMU

TM

power management

solution

optimized

for

the

power,

voltage

sequencing and control requirements of Rockchip

RK3066 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.

Product Brief, 22-Oct-12