Bidirectional DC/DC Converter Layout for Parallel Switch Current Sharing

The patent applies universality by using identical low-side transistors (ML1 to ML5) for both step-up and step-down operations. These transistors can be operated individually or in parallel depending on the mode, eliminating the need for separate transistor sets with different on-resistances. This multi-functional approach maintains current supply capacity while simplifying the layout and reducing device complexity.

The patent merges the functions of separate transistors for step-up and step-down modes into a single set of low-side transistors. By combining these functions into one transistor group that can be selectively operated, the layout complexity is reduced while maintaining the necessary current supply capacity for both operating modes.

The patent applies local quality by enabling selective operation of individual transistors (ML1 to ML5) based on the specific operating mode and current requirements. The controller can activate specific transistors locally within the group to match the current demands of step-up or step-down mode, ensuring uniform current distribution while maintaining adequate current supply capacity.

The patent implements dynamics by allowing the controller to dynamically adjust which transistors are activated based on real-time operating conditions. This dynamic control ensures that current is distributed evenly across the active transistors, preventing overheating and reliability issues associated with unequal current distribution, while still providing sufficient total current capacity.