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Voltage regulator employs digital dynamic-loop-compensation

New Products |
By eeNews Europe

Ericsson has introduced a new 3E* DC-DC regulator, the BMR461, that is the first 12 x 12 x 8mm 12A digital point-of-load (POL) module to combine Dynamic Loop Compensation (DLC), low-bias current technology, advanced energy-optimisation algorithms to reduce energy consumption, and a land-grid-array (LGA) footprint for thermal, mechanical and electrical performance.

The Dynamic Loop Compensation is based on ‘state-space’ or ‘model-predictive’ control, which guarantees stability while also achieving the optimum dynamic performance without requiring any external components. The new product performs an automatic compensation routine that is based on measured parameters, which enables the construction of an internal mathematical model of the power supply including external components such as filtering and parasitic resistors.

This, Ericsson says, removes the requirement for external components such as RC networks to adjust control loop compensation parameters, and as some board designs will employ 30 or even more 12A POL regulators, the BMR461 will simplify the design and maintenance process. When considering the board-space and time that is usually required for conventional technology to test and verify loop-stability of each module, the BMR461 represents significant savings both in terms of cost and time while also improving reliability.

Based on the ‘state-space’ mathematical model rather than traditional proportional-integral-derivative (PID) regulation, the BMR461 uses closed-loop pole placement and a model based on the resonant frequency of the output filter, thereby reducing the number of output capacitors required for filtering and stability. This technology is suitable for FPGA and processor applications where low-ESR decoupling capacitors are currently being used. It is designed to accommodate the majority of applications via PMBus commands.

The BMR461 claims significant gains in efficiency, especially in sub-1V modules where it performs up 10 points higher than high-market-average units. For example, taking power from a 5V intermediate bus, the BMR4613001 designed to power 0.6V applications reaches up to 85.7% efficiency at full load, whereas conventional units that are not using low-bias-current technology will have a typical efficiency of 75%. Or when operated from the 12V intermediate bus with the output set to 5V at 80% load, the BMR461 delivers 96% efficiency.

The unit recognises 84 PMBus commands and includes a non-volatile memory allowing board-power-designers to upload their own configuration files. The BMR461 also includes easy synchronisation through automatic pin detection and without the need for reconfiguration. In systems that use multiple BMR461s, the device offers the ability to reduce EMI and the amount of input filtering through phase spreading via the PMBus INTERLEAVE command.

The BMR461 operates over a wide input voltage range – 4.5V to 14.0V – which makes the product suitable for the most common bus voltages in intermediate-bus architecture systems, such as 5, 8 and 12V, and therefore reduces the number of modules required to carried in inventories. The regulator also features: pre-bias start-up and shut-down; monotonic and soft-start power-up; input under-voltage shutdown; over-temperature protection and power-good; output short-circuit and over-voltage protection; remote control and differential sense; voltage setting via pin-strap or PMBus; and an advanced set of configurations via the Ericsson DC/DC Digital Power Designer software.

Overall dimensions of the BMR461’s LGA are 12.2 x 12.2 with a maximum height of 8.0mm. A development board – ROA17003 – is also available to assist power system designers.

Ericsson Power Modules; www.ericsson.com/powermodules


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