ACT8846(2013) 查看數據表（PDF） - Active-Semi, Inc

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ACT8846
(Rev.:2013)

Advanced PMU for Multi-core Application Processors

Active-Semi, Inc 

ACT8846

Rev 1, 15-May-13

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-

Active-Semi Proprietary―For Authorized Recipients and Customers

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of NXP.

www.active-semi.com

Copyright © 2013 Active-Semi, Inc.

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