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The IR3521 is a highly integrated control IC designed specifically for AMD processors, featuring two converter outputs to supply both the VDD core and VDDNB auxiliary planes. With an impressive overall system setpoint accuracy of 0.5%, it ensures precise power delivery. The IR3521 incorporates the advanced xPHASE3TM phase IC, which not only provides comprehensive system control but also interfaces seamlessly with any number of phase ICs, each managing individual phases. This setup allows for efficient monitoring of the single-phase power supply, delivering a complete AMD SVID power solution. This article delves into the key features of the IR3521, its block diagram, and detailed application circuit diagrams, particularly focusing on the dual-output AMD SVID converter.
The IR3521 Control IC, coupled with the xPHASE3TM Phase IC, offers a robust and versatile solution for implementing a full AMD SVID power system. It caters to the needs of modern CPUs by providing dedicated outputs for both the VDD core and VDDNB auxiliary planes. The IR3521 takes charge of overall system control and communicates with multiple phase ICs, each responsible for driving and monitoring individual phases. The xPHASE3TM architecture leads to a power supply system that is more compact, cost-effective, and user-friendly, all while achieving superior efficiency compared to traditional methods.
Key Features of the IR3521:
- Two converter outputs tailored for AMD processor VDD core and VDDNB auxiliary planes.
- Support for high-speed (HS) I2C serial communication.
- PSI_L serial commands can be transmitted to a programmable number of phase ICs.
- Overall system setpoint accuracy of 0.5%.
- High-speed error amplifiers with a wide bandwidth of 20MHz and a fast slew rate of 10V/us.
- Remote sense amplifiers offering differential sensing, requiring less than 50uA of bias current.
- Programmable dynamic VID slew rates.
- Programmable VID offset (exclusive to VDD output).
- Programmable output impedance (exclusive to VDD output).
- Programmable dynamic OC for IDD_Spike.
- Programmable per-phase switching frequency ranging from 250kHz to 1.5MHz.
- hiccup overcurrent protection with delay during normal operation.
- Central overvoltage detection and communication to phase ICs via the IIN (ISHARE) pin.
- Overvoltage protection disabled during dynamic VID down to avoid false triggering.
- Overvoltage signal sent to the system during power-up and normal operation.
- Detection and protection against open remote sense lines.
- Linear regulator control for gate drive and IC bias, with programmable output voltage and UVLO.
The IR3521 is housed in a small, thermally enhanced 32L MLPQ (5mm x 5mm) package. [Figure 1 shows the block diagram of the IR3521.]
[Image description: A block diagram illustrating the internal structure and connections of the IR3521, highlighting the various components such as the control IC, phase ICs, and their interactions.]
For a clearer understanding, here’s a simplified application circuit diagram showcasing how the dual-output AMD SVID converter works. [Refer to the accompanying image below.]
[Image description: An application circuit diagram demonstrating the connection of the IR3521 with peripheral components, showcasing the dual-output functionality and how it interacts with the rest of the system.]
In conclusion, the IR3521 represents a significant advancement in power management solutions for AMD processors. Its innovative design and comprehensive feature set make it a preferred choice for engineers looking to optimize performance and efficiency in their systems.
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