12-A digital voltage regulator completes flexible second-generation product family
Like other products in the 3E series, the BMR462 offers a wide range of control and monitoring functions. Designers can configure their power systems to dynamically minimize energy consumption under all load conditions. This simplifies thermal management requirements and reduces CO2 emissions. Power system configuration is simplified through Ericsson’s PMBus graphical user interface. Although primarily designed to meet the requirements of information communications technology (ICT) applications, which account for some 70% of the market for board-mounted power modules, the BMR462 is equally suitable as a power conversion device for industrial applications and automation systems.
The compact BMR462 measures 21.0 x 12.7 x 8.2 mm (0.827 x 0.5 x 0.323 inches), fitting easily into systems with 15 mm board pitch. Its input voltage range is from 4.5 V to 14 V and the output range is 0.6 V to 5 V. At half-load, 5 Vin and 3.3 Vout, typical efficiency is 97.1%.
The BMR462’s synchronization capability means that multiple regulators can be locked to a common switching frequency. This eliminates beat frequencies that can be reflected back to the input, reduces EMI filtering requirements, and minimizes the external component count. Input capacitance requirements, and hence losses, are reduced by spreading the peak current drawn from the input supply over the complete switching cycle and a current sharing rail can be configured to enable 100% utilization of the output of each device. Through a PMBus command, one or more phases can be automatically switched off under light-load conditions, eliminating the current drain and switching losses associated with those phases. Adaptive diode emulation turns off the low-side MOSFET gate drive in the synchronous rectification circuit at low load currents. This gives a further boost to efficiency by eliminating losses that would occur if the circuit’s inductor current were permitted to go negative.
The BMR462 features integral signaling for remote control, current sharing, voltage tracking, voltage margining and remote sense. Voltage setting is achieved using pin strapping or via the PMBus and the device has comprehensive circuit protection built in.
Visit Ericsson Power Modules at www.ericsson.com/powermodules.
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