ACT8846QM490-T中文资料威讯联合数据手册PDF规格书

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.