Next generation non-isolated digital quarter brick DC/DC (1200 W peak power)

News • January 26, 2022

The BMR350 is a non-isolated DC/DC converter in a quarter brick format and is rated at 860 W continuous and 1200 W peak power. BMR350 is ideal as an intermediate bus converter for powering processors and ASICs with peak power demands. The product features an input of 40-60 V (80 V/100 ms) and a fully regulated output of 12 V at 100 A maximum, adjustable from 8 V to 13.2 V. An innovative transformer-coupled, non-isolated topology reduces component count and current stress and yields an efficiency level peaking at > 97.8% at half load 48 V input voltage. Derating for the BMR350 is characterized by the innovative Flex Power Modules 3D thermal data graphs which specify available output power for given real-world pin and baseplate temperatures up to 100°C, with the user’s airflow rate. This enables maximum power to be extracted without stress to the converter.

Picture: Maximum output power in relation to pin and baseplate temperature

For higher power levels, active current sharing between paralleled modules is an option. The BMR350 meets EMI standard EN 55032/FCC part 15J ‘Class B’ with a recommended external filter.

Full protection is included against output over-voltage, over-current and module over-temperature and a PMBus® interface provides remote control and monitoring, supported by the ‘Flex Power Designer’ software tool. A particular feature is the inclusion of an ‘event data recorder’ which can be interrogated for analysis of stress conditions before converter shut-down.

The BMR350 is in the standard quarter-brick format of 58.4 x 36.8 mm footprint with a height of just 12 mm, which includes the integrated baseplate with its threaded fixing holes. Terminations are via through-hole pins, suitable for pin-in-paste reflow, wave or manual soldering and positions are compatible with similar products on the market.

Anders Sellin, Product Manager Flex Power Modules comments “We have adopted a novel approach with the BMR350 with its transformer-coupled, non-isolated topology. This keeps costs and component stresses low without compromising efficiency”.

The product will be available in OEM quantities in the end of quarter 1/2022 and more variants will follow during 2022.