BMR320 Intermediate Bus Converter

Flex Power Modules’ BMR320 operates over a 40 V_DC/60 V_DC input range, producing a 5 V_DC to 7.5 V_DC output, ideal for powering point of load converters at lower intermediate bus voltages to optimize system efficiency. The device is rated at 400 W/60 A at 54 V input (80 A max output), and achieves an outstanding power density of 128 W/cm³ (2,126 W/in³), measuring just 27 mm x 18 mm x 6.4 mm. With efficiency peaking at 97.7%, up to three units can be paralleled for a total load of 1,080 W. The parts are designed for top side cooling to a heatsink with airflow or for liquid cooling via a thermal block, and the relatively flat design of the top side of the converter allows for easy connection via a thermal interface material such as a gap pad.

The unregulated, non-isolated architecture used in the BMR320 reduces the output impedance of the converter when compared to regulated designs, which effectively reflects the input bus capacitance efficiently to the output, enhancing its ability to cope with large load transients with minimal droop.

The BMR320 protection features include output current limit and overvoltage, along with overtemperature and input undervoltage. A PMBus^® interface is included for monitoring and control and the part is supported by the Flex Power Designer Tool.