ACT8897Q4I11C-T

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ACT8897Q4I11C-T Application field and Working Principle

ACT8897Q4I11C-T is an Integrated Power Solution by Advanced Card Systems Ltd., targeting ARM processor-based Mobile and Consumer applications. It provides up to nine outputs (3 buck, 3 LDO, and 3 switchable buck/LDO) for processor and I/O power in a limited PCB space area. Controlled by the ARM processor, the total output current of the device can be configured up to 2 A.

The ACT8897Q4I11C-T is a highly integrated and smart power solution. It employs an intelligent circuit topology, which is implemented with a Buck regulator and power switch capability. It includes multiple independent buck/L-DO/switchable buck/LDO regulators and linear regulators, allowing the power designer to optimize power performance and reduce the system BOM cost. The features such as dynamic voltage scaling, dynamic output voltage monitoring, dynamic current limit, and software control line enable the design of power ICs with configurable and optimized single-cell Li-ion solution.

The major targeted application of ACT8897Q4I11C-T are Digital Home Appliances, automotive, wearable devices and other applications involved with ARM processors and small size. It adopts a current-mode pulse-width modulation (PWM) architecture, along with the comprehensive feature set, provides a wide and flexible operating range for the increase of energy efficiency.

Working Principle

The ACT8897Q4I11C-T utilize a Buck regulator and power switch capability to provide up to nine regulated fixed or adjustable outputs. It includes two buck converters, three low dropout linears (LDOs) and three switchable buck/LDO. The buck converters of this device are realized with current-mode PWM controller, providing fast and accurate response to any load dynamic changes. The buck converters have excellent transient response along with short circuit protection and have low output voltage ripple. The switchable buck/LDO provides an output that can be switched between buck and LDO mode, with buck and LDO modes configurable from software.

The ACT8897Q4I11C-T features a dynamic voltage scaling function, which adjusts the output voltage and power profiles of the buck converters or the switchable buck/LDO converters in order to meet the changing application requirement of the system. The dynamic voltage scaling technology enables the buck converters to efficiently operate at higher output voltage and to reduce the ripple and noise. It also allows the switchable buck/LDO converters to switch between buck and LDO mode with proper switching level.

The ACT8897Q4I11C-T also features a dynamic output voltage monitoring (DVM) function, which continuously monitors the output voltage of the buck and switchable buck/LDO to ensure stability, accuracy and performance in real-time application. It also has adjustable over-temperature protection (OTP) and under-voltage lockout (UVLO) functions for all output channels.

In addition, the device has a dynamic current limit (DCL) function to protect the buck converter from overcurrent during the transient load conditions. This feature also provides excellent load current accuracy and controllability. The ACT8897Q4I11C-T also incorporates a power on/off controller, which acts as an interface between the processor’s system control line and the buck/switchable buck/LDO converters, allowing the system to be controlled by software.

Conclusion

ACT8897Q4I11C-T is a smart Integrated Power Solution by Advanced Card Systems Ltd., targeting ARM processor-based Mobile and Consumer applications. It utilizes an ingenious PWM architecture and comprehensive feature set, including dynamic voltage scaling, dynamic output voltage monitoring, dynamic current limit and software control line, to optimize power performance and reduce resources in a limited space. It is designed to provide up to nine outputs for processor and I/O power, and the total output current can be configured up to 2 A.

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