120A dual-phase DC/DC parallels up to 480A output

November 10, 2016 // By Graham Prophet
Ericsson Power Modules' BMR467 is a two-phase 120A fully digital point-of-load (POL) DC/DC power module that, with four devices operating in parallel, can deliver a total of 480A, representing a power density of 15 A/cm³ (250 A/in³); its SIP package format measures 50.8 x 19.05 x 8.2 mm.

The converter's features include Automatic Digital Compensation and a half-load efficiency of 93.2% at 12 Vin, 1.8 Vout. Delivering 30A per module more than its pin-compatible predecessor BMR465, the BMR467 is also compliant with the new ‘teraAMP’ AMP (Architects of Modern Power) specification.


Ericsson's design is fully digital, that is, the internal control loop of the converter is digital, for which, among other benefits, Ericsson says delvers an efficiency curve that is flatter, and maximised, over more of its load range. The unit is ready for future Software-Defined Power Architecture (SDPA) systems, anticipated as a path to efficient and energy-optimized network architectures by 2020.


The BMR467 POL converter can be operated as a standalone unit delivering 120A at output voltages from 0.6V to1.8V, an output power up to 216W, as well as being part of a larger power system when processor boards require higher current. Built on a two-phase topology, the modules can become part of a multi-module and multiphase (up to eight-phase) power system that enables phase spreading, which reduces peak current and also the number of capacitors required by end systems. The module can be configured with support available via the downloadable Ericsson Power Designer software tool.


The BMR467 offers automatic digital compensation to provide stability, accurate line and load regulation, and excellent transient performance across a wide range of operating conditions, including switching frequency, input voltage, output voltage and output capacitance. Output voltage is adjustable via a pin-strap resistor or PMBus commands; and operation from a 7.5V to 14V input suits the BMR467 ideally to operation in distributed power and intermediate bus voltage architectures. Ericsson adds that the module achieves its power efficiency figures using the latest generation of power switches – still using silicon devices – the company has not needed to change to wide-band-gap semiconductors.


As with other AMP format products, a compatible second-source will be available from at least one