Surface-mount advanced bus converter saves board space

May 14, 2013 // By EDN
Ericsson has introduced a surface-mounted version of its second generation of digital Advanced Bus Converter (ABC) products, called the BMR456-SI, a high-efficiency, digitally controlled DC/DC converter compliant with full surface-mount manufacturing processes; high-precision tooled pins guarantee high co-planarity and robustness.

Highly advanced firmware integrated in the BMR456-SI contributes towards significant reduction in energy consumption; output voltage is tightly regulated (±2%) over the full operational range of 36V to 75V, and the units deliver output power up to 468W for datacom applications.

The BMR456-SI is based upon the FRIDA II platform. Both the surface-mount BMR456-SI and the through-hole BMR456-PI quarter-brick 3E* Advanced Bus Converters support system architects who are developing equipment for ICT (Information and Communication Technology) applications. These applications require fast response time, tightly regulated intermediate bus voltages and high efficiency at any point of operation to reduce power consumption.

“Ericsson is the only company in the industry to offer high-power DC/DC modules that are digitally controlled and also offer a surface-mount option,” said Patrick Le Fèvre, Marketing and Communication Director, Ericsson Power Modules. “The addition of a surface-mount version to the PMBus compliant FRIDA II BMR456 DC/DC converter family is an indication of the strong market demand for highly integrated power technology that can also make a significant contribution to reducing energy consumption.”

Board density is increasing and to simplify manufacturing processes, power module suppliers need to offer surface-mount alternatives to conventional through-hole versions. Although it is not necessarily an issue at low- and mid-power levels, it can be a significant challenge for high power modules and even more so when these modules require additional I/O. Ericsson’s advanced mechanical surface-mount technology is based on highly accurately tooled pins that are inserted and aligned during the original assembly process. The same hardware is used for through-hole and surface-mount versions of the BMR456, which increases the flexibility and speed of manufacturing and contributes to smaller lead times. The surface-mount pins are manufactured with very tight tolerances, guaranteeing co-planarity and mechanical accuracy. This process ensures high reliability and host equipment availability.

In addition to input and output power connections, additional I/O (+/– output remote sense, address pin, PMBus clock and data, power