BMR321 series

Main Features

The BMR321 is a non-isolated, unregulated Intermediate Bus Converter (IBC) housed in a package measuring just 41.47 x 17.67 x 6.9mm (1.63 x 0.7 x 0.26 in) designed for the OCP OAM v2.0 standard, and delivers 750W of continuous output power and a peak power of 1500W over an input voltage range of 40-60V.

The unregulated device utilizes an 8:1 fixed ratio, meaning the output voltage ranges from 5-7.5V, ideal for those applications that require a lower intermediate bus voltage that can be helpful to optimize overall system efficiency when used in conjunction with downstream POLs, VRMs or Integrated Power Stages such as the BMR510 and others.

With efficiency peaking at 98.05%, up to two units can be paralleled with the inclusion of a SYNC pin to provide a total load of 1500W continuous. The parts are mechanically and thermally designed for top-side cooling to a heatsink with airflow, or for liquid cooling via a thermal block, with the open deck baseplate on the topside of the converter allowing for easy connection via a thermal interface material such as a gap pad.

The BMR321 protection features include output current limit and over-voltage, along with over-temperature and input under-voltage. A PMBus® interface is included for monitoring, configuration and control, and the part is supported by the Flex Power Designer Tool.

As with all Flex Power Modules’ DC/DC converters, it complies with IEC/EN/UL 62368-1 safety standards.