ISL6323 Hybrid SVI/PVI Monolithic Dual PWM Hybrid Controller Powering AMD SVI Split-Plane and VI Uniplane Processors

The ISL6323 dual PWM controller provides high efficiency and precise regulation through two synchronous buck DC/DC converters. It supports hybrid power control for AMD processors, operating via either a 6-bit parallel VID interface (PVI) or a serial VID interface (SVI). The dual output ISL6323 includes a multiphase controller for the uniplane VDD core voltage and a single-phase controller for the Northbridge (VDDNB) in SVI mode. In PVI mode, only the multiphase controller is active to support processors that utilize uniplane VDD. A precision uniplane core voltage regulation system is achieved with a 2- to 4-phase PWM voltage regulator (VR) controller. The integration of two power MOSFET drivers enhances layout flexibility and reduces the number of external components in the multiphase section. Additionally, a single-phase PWM controller with an integrated driver provides another precision voltage regulation system for the Northbridge section. This monolithic dual controller with integrated driver offers a cost-effective and space-efficient power management solution. The ISL6323 also features output voltage droop for applications that benefit from load line programming, minimizing the need for bulk output capacitors. The multiphase section incorporates advanced control loop features for optimal transient response during load application and removal. Among these features is highly accurate, fully differential, continuous DCR current sensing, which facilitates load line programming and channel current balance. Another distinctive feature is dual edge modulation, enabling a quicker initial response to high di/dt load transients.

The ISL6323 dual PWM controller is designed for high-performance power management applications, particularly in systems utilizing AMD processors. The architecture allows for flexible operation modes, adapting to the requirements of different processor configurations through either the PVI or SVI interfaces. The multiphase controller's ability to handle uniplane VDD core voltage ensures efficient power delivery to the processor, while the single-phase controller effectively manages the Northbridge voltage.

The precision voltage regulation provided by the 2- to 4-phase PWM VR controller is critical for maintaining stable operation under varying load conditions. The integration of power MOSFET drivers within the ISL6323 not only simplifies the design by reducing the number of external components needed but also enhances the overall efficiency of the system. This is particularly beneficial in compact designs where space is at a premium.

Moreover, the output voltage droop feature is essential for applications that require dynamic load response. By implementing load line programming, the ISL6323 can adjust the output voltage in response to load changes, effectively reducing the need for large output capacitors and improving transient performance.

The advanced control loop features, including continuous DCR current sensing, ensure precise load current measurement and channel balancing, which are vital for maintaining optimal performance across multiple phases. Dual edge modulation further enhances the controller's responsiveness to rapid changes in load, making it suitable for high-speed applications that demand quick transient response.

Overall, the ISL6323 dual PWM controller exemplifies a sophisticated solution for power management, combining efficiency, flexibility, and advanced features to meet the demands of modern electronic systems.The ISL6323 dual PWM controller delivers high efficiency and tight regulation from two synchronous buck DC/DC converters. The ISL6323 supports hybrid power control of AMD processors which operate from either a 6-bit parallel VID interface (PVI) or a serial VID interface (SVI).

The dual output ISL6323 features a multiphase controller to support uni plane VDD core voltage and a single phase controller to power the Northbridge (VDDNB) in SVI mode. Only the multiphase controller is active in PVI mode to support uniplane VDD only processors. A precision uniplane core voltage regulation system is provided by a 2- to 4-phase PWM voltage regulator (VR) controller. The integration of two power MOSFET drivers, adding flexibility in layout, reduce the number of external components in the multiphase section.

A single phase PWM controller with integrated driver provides a second precision voltage regulation system for the North Bridge portion of the processor. This monolithic, dual controller with integrated driver solution provides a cost and space saving power management solution.

For applications which benefit from load line programming to reduce bulk output capacitors, the ISL6323 features output voltage droop. The multiphase portion also includes advanced control loop features for optimal transient response to load application and removal.

One of these features is highly accurate, fully differential, continuous DCR current sensing for load line programming and channel current balance. Dual edge modulation is another unique feature, allowing for quicker initial response to high di/dt load transients.

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