Infineon XDP8HD40S-1 hot-swap controller for 800 V AI power
Infineon has introduced the XDP8HD40S-1, a high-voltage hot-swap controller designed to protect and monitor power delivery in next-generation AI data centres operating at 800 VDC and ±400 VDC. The device supports safe connection and disconnection of power modules, converters, GPUs and server subsystems, addressing the growing need for reliable power management as AI infrastructure moves towards higher rack power levels.
The controller extends Infineon’s power semiconductor portfolio into high-voltage power-path protection and monitoring, complementing its silicon, silicon carbide (SiC) and gallium nitride (GaN) technologies for AI data centre applications.
“Future AI data centres require power delivery systems that combine high efficiency, maximum reliability, and comprehensive protection capabilities,” said Magdalene Boebel, Senior Vice President and Business Line Head of Power System ICs at Infineon. She added that the XDP8HD40S-1 provides designers with hot-swap, monitoring and protection functions for ±400 V and 800 V power architectures.
The XDP8HD40S-1 targets high-voltage power delivery applications, including 800 V or ±400 V intermediate bus converters, GPU power systems, high-voltage rack and server infrastructure, battery backup systems and peak shaving. It also supports single- and dual-side hot-swap implementations across 400 V to 800 V systems.
Designed to work with Infineon power semiconductors, including OptiMOS MOSFETs and CoolSiC JFETs, the controller enables designers to develop protection stages for high-voltage power systems. It is intended to complement Infineon’s existing 800 VDC AI data centre reference designs.
At higher operating voltages, controlling inrush current and responding to transient events are critical to protecting power infrastructure. The device integrates digital safe operating area (SOA) control, programmable and preconfigured active protection, and a variable-pulse SOA control mode known as Boost Mode to optimise startup behaviour while keeping the power switch within its safe operating limits.
An integrated gate driver supports external SiC cascode configurations combining MOSFETs and JFETs. Surge immunity protection and configurable fast shutdown, with a 1.5 A pull-down current, provide additional safeguards under abnormal operating conditions.
For integration into rack- and server-level power systems, the XDP8HD40S-1 supports a VDDB operating range of 4.5 V to 24 V and a VDDA range of 4.5 V to 13.2 V.
A PMBus 1.5 interface supports system management and remote diagnostics, while an integrated black-box recording function captures critical event information to assist fault analysis and system debugging. Further protection features include programmable input and output overvoltage and undervoltage protection, external temperature sensor support and overtemperature protection.
The controller also incorporates 12-bit analogue-to-digital converters for current and voltage measurement. Infineon specifies measurement accuracy of approximately 1% for voltage, 1% for current and 3% for power. Analogue power monitoring has a stated accuracy of 1.5%, while integrated energy metering enables continuous monitoring of system power consumption.
These capabilities can help system designers improve power management, investigate faults and monitor operating conditions in high-density AI computing infrastructure.
The controller complements Infineon’s work on 800 V-to-48 V and direct-conversion power architectures as AI data centre operators seek to scale rack power while maintaining efficiency, reliability and system visibility.
