Framingham, Mass. - Artesyn Technology's new VRM10 series of point-of-load (POL) DC/DC converters, for meeting the core requirements of latest-generation processors and fast switching logic, offer up to 85 amps at 1.4 volts and a raw transient response of up to 930 amps/microsecond. The open-frame, single-board series includes the VRM10-80-12-P, with a maximum continuous current rating of 80 amps, and a load-line impedance of 1.24 milliohms (maintaining load regulation to 1.24 mV/A) for Pentium 4 processors. The VRM10-85-12-U can deliver up to 85 amps continuously and is optimized for use with for high-end server type processors such as the Xeon. Operating from a 12-volt input, these modules are programmable in 12.5 mV steps to deliver from 0.8375 to 1.6 VDC.
The (nonisolated) VRM10 converters use a four-phase buck conversion topology operating at an equivalent switching frequency of 2.2 MHz for high efficiency operation (up to 86 percent). Measuring 3.19 by 0.77 inches to offer a flexible plug-in alternative to embedded voltage regulators on densely populated motherboards, the modules plug vertically into a standard motherboard connector and have an installed height of just 1.24 inches, suitable for 1U-high equipment. These regulators feature droop compensation to automatically increase their DC output impedance (i.e., decrease their output voltage) as load current increases. Droop compensation significantly reduces the voltage overshoot normally caused by large step-changes in current, contributing to significantly faster transient response.
The POLs are rated for operation over 0 to +60°C with derating (full power to +45°C with 400/600 lfm cooling). Both converters feature remote-sense and remote on/off capabilities, have no minimum load requirement, and are fully protected against fault conditions. They are priced at $35.25 each for the VRM10-80-12-P, and $36.35 for the VRM10-85-12-U, both in 1k quantites. Standard lead-time for both models is stock to 8-12 weeks.