Digital POL regulator for ICT and industrial applications

11th December 2013
Nat Bowers

Ericsson has today introduced a third-generation digital point-of-load regulator with Dynamic Loop Compensation. The new Ericsson 3E series BMR463-25A offers a 25% increase in output current over the previous generation BMR463-20A, but is supplied in a fully compatible footprint. It also includes a full set of PMBus commands for fully monitoring and dynamically controlling the energy delivered to strategic components to a very low and highly economical level.

Patrick Le Fèvre, Marketing and Communication Director, Ericsson Power Modules, commented: “The second generation of Ericsson 3E POL regulators were introduced in February 2011 and rapidly became the reference digital point-of-load devices and gained impressive market adoption. The third generation results from very close cooperation with systems architects that require additional flexibility and simplicity, while also retaining the ability to control parameters to match specific applications. Following the recently released 12x12 12A BMR461, the BMR463-25A now offers Dynamic Loop Compensation to volume markets that are demanding this type of product.”

The BMR463-25A embeds the latest DLC technology in order to run the DLC algorithm as default each time the output is enabled. The PMBus enables systems architects to select the best method for their application: the DLC algorithm can be run every second or every minute or simply disabled. The latest Ericsson Power Designer software includes the Loop Compensation Tool which designers can use to set their own loop compensation profile to match specific application requirements. Comprising the the latest MOSFET technology to ensure the highest possible efficiency, the BMR463-25A provides up to 95.2% efficiency at 3.3V output and up to 89.4% at 1.0V when the output load is at 50%.

Featuring dimensions of 25.65 mm x 13.8 mm x 8.2mm, the BMR463-25A is ideally suited for low-profile board applications that require all components to be below 10mm making room for heat transfer materials in the case of cold-wall cooling. There are three variations available: the through-hole BMR4630008, the surface-mount BMR4631008, and the single-in-line BMR4632008. Suiting applications where headroom is required for power derating, the BMR463-25A addresses a large range of applications in the ICT sector, as well as the industrial segment, which is rapidly migrating from traditional analog point-of-load to digital control technologies.

Offering an adjustable output voltage from 0.6V to 3.3V with the factory default set at 1.2V, the BMR463-25A complies with most intermediate bus voltages (5V to 12V) used in the industry with an input voltage range of 4.5V to 14.0V. Simple PMBus commands or a 1% tolerance pin-strap resistor adjusts the output voltage to offer 28 different levels.

The BMR463-25A can be paralleled with up to seven devices to provide a total current of 175A. The parallel modules can then be synchronized with the use of phase-spreading (which can be simply simulated and programmed via the tools embedded in the Ericsson Power Designer software tool) to reduce noise and peak current. The BMR463-25A also features current sharing, voltage tracking and margining, non-linear response for reducing of decoupling capacitors, input under-voltage shutdown, over-temperature protection, output short-circuit and over-voltage protection, remote control and power-good, and a full PMBus set of commands for monitoring and control.

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