IN Brief:
- Infineon has completed its acquisition of Bengaluru-based C2i Semiconductors following the agreement announced in August.
- C2i adds expertise in multiphase controllers, smart power stages, digital control and vertical power delivery architectures.
- The acquired team has joined Infineon’s Power Systems division and will contribute to future substrate integrated voltage regulator development.
Infineon Technologies has completed its acquisition of Bengaluru-based C2i Semiconductors, bringing the company’s digital power engineering team into its Power Systems division as it develops more tightly integrated power delivery architectures for AI processors.
The transaction was announced in August and had been expected to close during the third quarter of 2026. The original agreement centred on C2i’s software defined multiphase controllers and smart power stages; completion now places those capabilities inside Infineon alongside its silicon, silicon carbide and gallium nitride power semiconductor portfolios.
C2i develops digital control technology for the multiphase converters used to supply high current, low voltage processor rails. Several switching phases share the electrical and thermal load, while their timing is offset so that the combined output produces less ripple than a single converter carrying the same current.
Digital control adds another layer by allowing phase operation, balance and switching behaviour to change as processor demand moves. AI accelerators can shift rapidly between idle, memory intensive and compute intensive states, creating steep current transients that the regulator has to follow while keeping the processor rail within a narrow voltage tolerance.
The semiconductor devices and the control loop therefore operate as one power system. Faster switches can reduce conversion losses, but controller response, magnetics, package inductance, current path resistance and cooling all affect how quickly useful power can reach the processor when the load changes.
Infineon is combining C2i’s control expertise with a device portfolio spanning silicon, SiC and GaN. The most appropriate technology changes along the route from incoming rack power to the processor core because the blocking voltage, switching frequency and current requirements of an upstream converter differ substantially from those of the final regulator close to the compute package.
The company describes that path as extending from grid to core, with C2i adding system level expertise around its later stages. Moving the final conversion physically closer to the processor can shorten the high current path, reducing resistive and inductive losses that otherwise limit transient response.
Vertical power delivery takes that principle further by routing current through structures beneath or within the processor assembly instead of carrying the entire load laterally across a motherboard. Shorter conductors reduce path resistance and inductance, although the change places more of the electrical, mechanical and thermal design inside the package and substrate.
C2i’s work includes architectures leading towards substrate integrated voltage regulators, where conversion moves into the substrate immediately beneath the compute device. Such an arrangement can improve response to rapid load changes because the last conversion stage sits closer to the processor, but it also has to fit around signal routing, cooling and package construction within very limited space.
Adam White, president of Infineon’s Power Systems division, said: “Completing this acquisition marks an important milestone for our AI power business and our innovation activities in India. C2i Semiconductors brings exceptional expertise in software-defined power management and system-level power architectures, backed by a highly experienced engineering team. By combining these capabilities with Infineon’s semiconductor technologies, application know-how, manufacturing capabilities and global customer reach, we will accelerate innovation in power delivery solutions for AI data centers and create significant value for our customers. I am delighted to welcome the C2i team to Infineon.”
The C2i engineers now become part of Infineon’s wider R&D organisation in India, where the semiconductor company employs approximately 2,800 people. Bengaluru consequently gains a larger role in the company’s digital power development as work that previously sat within an acquisition target moves into an established Power Systems engineering structure.
Power architecture around AI systems is changing at both ends of the conversion chain. Higher voltage distribution is moving deeper into racks to reduce current and conductor losses, while final conversion stages are moving towards the processor to improve low voltage transient behaviour. Coordinating those stages requires control algorithms, power devices, packaging and thermal design to operate across a much wider electrical span.
The 5 October development does not introduce a finished C2i-based regulator. It confirms that the transaction has closed and that C2i’s multiphase control, smart power stage and vertical delivery expertise is now part of Infineon’s Power Systems organisation, where future products can be developed alongside the company’s existing semiconductor technologies.
