What Infineon gains from its acquisition of C2i Semiconductors

Infineon Technologies has completed its acquisition of C2i Semiconductors, adding digital multiphase control and smart power-stage technology to a portfolio already spanning high-voltage conversion, power semiconductors and point-of-load regulation.

C2i, based in Bengaluru, develops software-defined multiphase controllers, smart power stages and system-level power architectures for AI servers and high-performance computing. Its engineering team will become part of Infineon’s Power Systems division.

Financial terms were not disclosed when the transaction was announced or completed.

Moving control into Infineon’s power portfolio

Infineon already supplies power semiconductors across much of the data-centre energy path. Its products include silicon, silicon carbide and gallium nitride devices used in power supplies, converters and voltage regulators.

C2i adds more of the control layer. A multiphase controller coordinates several switching phases to deliver a high current at a low output voltage. Adjusting the number and timing of active phases allows a regulator to respond to rapid load changes while managing efficiency and heat.

That behaviour matters as processors and accelerators move between power states quickly. Supplying those loads requires more than efficient transistors: the control system must respond to changes without allowing the rail voltage to move outside its permitted range.

C2i’s software-defined approach is intended to make this regulation more adaptable. Infineon has also highlighted the company’s work on substrate-integrated voltage regulators, which place power conversion closer to the processor package.

Grid-to-core positioning

Infineon describes its strategy as covering the power path from grid to core. At the grid-facing end, this includes high-voltage switching and conversion. Closer to the processor, the voltages become lower while the currents rise substantially.

The acquisition does not by itself establish a complete vertical power-delivery product line. It does, however, combine controllers and system knowledge with Infineon’s existing power-device portfolio.

This could allow the company to offer more closely integrated reference architectures rather than supplying individual switches or modules. It may also provide earlier visibility of how controller behaviour, packaging, thermal performance and semiconductor characteristics interact.

An engineering centre in India

C2i’s team will also expand Infineon’s engineering presence in India. The company said the acquisition will create a centre of excellence for digital power technology in Bengaluru.

The transaction was announced in August and completed on 5 October 2026. Infineon has not disclosed a timetable for incorporating C2i technology into commercially available product families.