Energy saving digital voltage regulators offer improved levels of control at up to 40-A ouput

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By eeNews Europe

The BMR464 offers easy paralleling and current sharing. Up to seven modules can be paralleled, offering a maximum output current of 280 A. The regulator’s easy-paralleling mode even makes it possible to combine its 20 A counterpart, the BMR463, thus enabling ‘mix and match’ optimized efficiency from low loads up to 60 A. The devices are suitable for a wide range of applications including radio base stations, industrial automation, process control, transportation and large data centers. Ericsson’s intuitive graphic user interface for the PMBus makes power system configuration fast and simple.

The BMR464 is a small regulator measuring 30.85 x 20.0 x 8.2 mm (1.25 x 0.0787 x 0.323 inches), so it can be used in compact systems with 15 mm board pitch. The regulator accepts input voltages from 4.5 V to 14 V and has an output voltage range of 0.6V to 3.3V with typical efficiency of 97.2% at 5 Vin, 3.3 mVout and 50% load.

A synchronization feature allows several regulators to be locked to a common switching frequency in order to eliminate beat frequencies that can be reflected back to the input. The feature reduces EMI filtering complexity and the number of external components needed. Phase spreading reduces input capacitance requirements, and hence losses, because the peak current drawn from the input supply is spread over the whole switching cycle.

A current sharing rail can be configured that enables 100% utilization of the output of each device and, during periods of light loading, it is possible to disable one or more phases to eliminate the current drain and switching losses associated with those phases. The process is handled automatically using a PMBus command. Efficiency is further enhanced with adaptive diode emulation that turns off the low-side MOSFET gate drive in the synchronous rectification circuit at low load currents. This prevents the circuit’s inductor current from going negative, eliminating the losses that would result.

The BMR464 features comprehensive circuit protection. Signaling is provided for remote control, power good, current sharing, voltage tracking, voltage margining and remote sense. Voltage setting is done via pin strapping or the PMBus.

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