Quarter-brick delivers unmatched power density for AI data centres

Designed to power distribution boards for the latest high-performance GPUs, the BMR352 is ideal for data centres supporting AI and machine learning applications. Representing the 9th generation in digital quarter bricks, the BMR352 achieves five times the power output of the first-generation model, delivering a significant leap in power density and performance.

The BMR352 provides a continuous power output of 2kW and can deliver up to 3kW peak power for a limited time making it particularly suitable for power-hungry applications. With an input voltage range of 40–60V and a regulated output voltage of 12.2V, the module achieves an impressive peak efficiency of 97.9% at just over half-load. Its compact size of 58.4 x 36.8 x 14.5mm (2.30” x 1.45” x 0.57”) allows for easy integration into space-constrained environments, while the digital interface provides flexibility in configuration.

This converter is designed for through-hole mounting using wave solder or pin-in-paste production, and features a novel design of baseplate, which enhances thermal performance while minimising height.

Although active current sharing (ACS) capability for more effective parallel connection between two or more converters will be available soon with the BMR352, a new variant of the BMR351 range of non-isolated DC/DC converters has been launched which features ACS.

The BMR3512201/031 variant enables equal load sharing between multiple converters in parallel for higher load power demands, minimising the dynamic response required from each unit and enabling more precise current sharing than droop load sharing methods. This system approach reduces output disruption and enhances the overall stability of the power supply to prevent issues that could lead to downtime or component damage. Droop Load Sharing (DLS) variants will also be offered for the BMR351.

Similar to the BMR352, baseplates are available on both sides to enhance thermal performance. Additionally, configurations can be easily updated according to custom requests, whether for refreshing inventory or even in the field during potential firmware or CDA upgrades. Similarly, the BMR3512201/031 has a 40–60V input range and delivers a non-isolated but fully regulated output of 12.2V nominal. Both modules meet the latest IEC/EN/UL 62368-1 safety standards.

The products are compatible with Flex Power Designer, a software tool providing configuration, performance simulation, and monitoring features via a PMBus interface. The software is downloadable for free at the flex power design website.

Flex Power Modules will be showcasing these solutions in Hall C3, Stand 439, at electronica 2024 held in Munich from 12–15 November 2024.