Power Electronics

POL DC-DC Converters

Artesyn Technologies’ new VRM10 Series of nonisolated point-of-load dc-dc converters meets the demanding core power requirements of latest-generation processors and fast switching logic. The converters offer dynamic voltage programming, exceptionally fast transient response capabilities that extend to 930A/µs and continuous current outputs as high as 85 A. The series includes application-optimized models for powering Intel Xeon processors—typically used in rack-mounting enterprise products such as servers and routers—as well as Intel desktop product family processors, such as the Pentium 4.

VRM10 Series converters use an advanced 4-phase buck conversion topology with interleaving to achieve a very high equivalent switching frequency of 2.2 MHz; this yields conversion efficiencies of up to 86% when delivering 85 A at 1.4 V, combined with very fast transient response capabilities. The topology also helps minimize component count, resulting in lower build costs and an exceptionally compact form factor. Measuring 3.19 in. × 0.77 in. (81 mm × 19.5 mm), VRM10 converter modules plug vertically into a standard motherboard connector and have a low installed height of just 1.24 in. (31.5 mm). The modules’ small footprint means that they offer a particularly flexible, plug-in, alternative to embedded voltage regulators on densely populated motherboards. Furthermore, their minimal height means that they are suitable for use in 1-U high equipment, supporting the industry trend toward slimmer rack-mount systems.

Complying with Intel’s VRM10.0 and 10.1 specifications, Artesyn’s VRM10 Series converters operate from a nominal 12-Vdc input and can generate any voltage in the range 0.8375 Vdc to 1.6 Vdc. The output voltage is programmable in 12.5-mV steps, defined by standard 6-bit VID (voltage identification) codes. The converters’ dynamic programming capability enables processors to automatically scale operating frequency and supply voltage to suit the prevailing temperature, thus maximizing performance and reliability.

For more information, visit www.artesyn.com.

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