The BMR458 third-generation 3E quarter-brick bus converter has been upgraded to integrate burst-mode operation, which enables the module to handle 1,079 W of peak power for up to a maximum of one second. This burst-mode or peak-power capability eliminates the need for a second converter module to be placed in parallel. High-performance microprocessors and ASICs will require this burst of high-current demand that is typically well in excess of normal system operation. The quarter brick suits high-power applications that are powered by multi-cell batteries or rectifiers commonly used in the Information and Communication Technology (ICT) industry and employ intermediate bus conversion (IBC) or dynamic bus voltage (DBV) architectures.
Other features of the BMR458 include: 650-W power delivery, accurate current sharing, and active- or droop-current sharing. Other key features including dynamic load compensation, snapshot parameter capture, and a PMBus V1.3 interface. Key electrical characteristics include efficiency up to 96.6% at half load and 96.3% at full load; maximum current output of 54.2 A; tightly regulated 12-V output (±2 mV, typical) across the 40- to 60-V input voltage range; output current monitoring of ±1 A to enable accurate system-monitoring capability; and a fast transient recovery time of 1 ms. Further specifications include: an MTBF of 8.2 million hours; and I/O functional isolation of 2,250 Vdc, which meets the latest IEC/EN/UL60905 safety standard. The converter is available in the industry-standard quarter-brick format with dimensions of 2.28 x 1.45 x 0.5 in. It is also available with an optional baseplate, enabling connection to a heatsink or cold plate for extreme environments.
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