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ACT8840 PDF预览

ACT8840

更新时间: 2024-11-30 01:22:39
品牌 Logo 应用领域
技领 - ACTIVE-SEMI /
页数 文件大小 规格书
39页 681K
描述
Advanced PMU for Single-core Application Processors

ACT8840 数据手册

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ACT8840  
Rev 1, 07-Feb-14  
Advanced PMU for Single-core Application Processors  
FEATURES  
GENERAL DESCRIPTION  
The ACT8840 is a complete, cost effective, and  
highly-efficient ActivePMUTM power management  
solution optimized for the power, voltage  
sequencing and control requirements of general  
Single-core application processor.  
INTEGRATED POWER SUPPLIES  
Four DC/DC Step-Down (Buck) Regulators  
2 x 1.8A, 2 x 1.3A  
Five Low-Noise LDOs  
2 x 150mA, 3 x 350mA  
The ACT8840 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  
1.8A of output current and can fully satisfy the  
power and control requirements of the single-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.  
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  
I2C Serial Interface  
Interrupt Controller  
SYSTEM MANAGEMENT  
Reset Interface and Sequencing Controller  
Power on Reset  
Soft / Hard Reset  
Watchdog Supervision  
Multiple Sleep Modes  
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.  
Thermal Management Subsystem  
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.  
APPLICATIONS  
Tablet PC  
Mobile Internet Devices (MID)  
Ebooks  
Personal Navigation Devices  
The ACT8840 is available in a compact, Pb-Free  
and RoHS-compliant TQFN66-48 package.  
Innovative PowerTM  
- 1 -  
www.active-semi.com  
Active-Semi ProprietaryFor Authorized Recipients and Customers  
ActivePMUTM is a trademark of Active-Semi.  
I2CTM is a trademark of NXP.  
Copyright © 2014 Active-Semi, Inc.  

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