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New digital voltage regulator minimizes space and energy usage

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By eeNews Europe

The new BMR464-SIP (BMR4642002) meets the demands to save valuable board space for the core components as it enables vertical mounting – also known as single in-line packaging (SIP), which is often used for devices such as memory chips, voltage regulators and other control boards. This approach delivers a device footprint of less than 2.5 cm2 (0.39 in2), making the new device ideal for space-critical applications.

The new regulator can also easily be configured and monitored via the standard PMbus communication protocol and the company’s intuitive graphical user interface, making this the first PMBus-compliant 40 A point-of-load SIP device available on the market, and offering designers the ability to fully optimize power management in high board-density applications.

The primary end-use applications are network routers, data storage and AdvancedTCA (Advanced Telecommunications Computing Architecture) boards, but the low height of the BMR4642002 also makes it suitable for many other applications when space is at a premium. The device’s measurements of 33.00 x 7.6 x 18.1 mm make the product suitable for those high-density boards that require a small footprint and height below 20 mm, guaranteeing a safe and comfortable fit when assembled in 1-inch rack systems.

In addition to the small footprint of 2.5 cm2, a corresponding key feature of the 40 A- and 132 W-output regulator is a market-leading power density of almost 53 W/cm2. The regulator accepts input voltages from 4.5 V to 14 V and has an output voltage range of 0.6 V to 3.3 V with typical efficiency of 97.2% at 5 Vin, 3.3 Vout and 50% load.

The BMR464-SIP is based on Ericsson’s leading-edge digital-core controller combined with the latest MOSFET technology and built-in energy-optimization algorithms that not only contribute to reducing energy consumption and power dissipation, but also deliver an impressive amount of features and level of flexibility.

The design concept underlying the company’s second-generation 3E POL devices makes it possible for systems designers to reduce energy consumption to the necessary minimum for system operation. Like the other BMR464, the new BMR464-SIP regulator offers unprecedented functionality enabling full monitoring and dynamic controlling of the power delivered to processors, FPGAs, ASICs and other components, ensuring minimum energy consumption under all operating conditions.

A synchronization feature allows several regulators to be locked to a common switching frequency to eliminate beat frequencies. This reduces EMI filtering complexity and the number of external components needed. Additionally, 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 enabling 100% utilization of the output of each device and also, during periods of light loading, one or more phases can be disabled eliminating the associated current drain and switching losses. This 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.

The BMR464-SIP also 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.

The vertical-mount BMR464-SIP uses two through-hole connectors: one for low-power signals and the second for power. Each power pin (VIN, VOUT and GND) has been doubled, reducing power losses and improving thermal conduction.

Visit Ericsson Power Modules at www.ericsson.com/powermodules.


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