Linear regulators are easy to deploy, but not particularly efficient. Classic stand-alone switching regulators make for an interesting design experience. With the MPM3612 family, MPS provides an easy-to-deploy switching regulator module in an assembly-friendly form factor.

Getting switching regulators past EMI tests raises various questions, for example, those related to emissions caused by the PCB design. Furthermore, selecting the correct passive components and placing them in the right position is instructive for HF design. Deploying an MPS power module provides a neat workaround -- the product is fully enclosed and brings all required passives. Furthermore, its EMI emissions are checked to comply with various standards.

LGA Form Factor for Easy Deployment

MPS packages the power module in a 3 x 3 millimeter LGA case with the pinout shown in the diagram above. A power-good signal and an enable input support the power-electronics designer. The module can be feathered at will via its EN input, thereby permitting hibernation of process computer-based designs via a separate power manager chip. A reference design is shown in the figure below.

Protection Features and EMI Compatibility Included

When constructed in accordance with the guidelines outlined in the datasheet, the EN55022 EMI specifications are met with a wide margin, as shown in the diagrams below.

The system usually operates at a switching frequency of around 1.25 MHz, which keeps noise well above audible bands. Thus, microcontroller designs that contain audio components can use this regulator without concern.

In terms of protective features, MPS adds thermal shutdown, overcurrent, and overvoltage protection. Combined, these functions ensure the long-term reliability of systems based on the MPS regulator module. The operating temperature range of 40°C to +125°C simplifies thermal design.

General and 3.3V Specific Versions Are Available.

MPS provides two versions of the power module. Variant MPM3612 can be tuned via two external resistors, in a fashion similar to the well-liked LM317, while the MPM3612-33 is a 3.3V fixed-output variant intended to power digital electronics. Both versions of the power module support a wide input voltage range of 3V to 22V, enabling these buck converters to be deployed in almost all scenarios.

Finally, the exceptionally high efficiency and low quiescent current (about 5 microamperes) deserve an honourable mention.

Conclusion

Replacing a linear regulator with the MPM3612 is beneficial in multiple ways: not only does the system become more efficient, but it can also be assembled more easily and with lower space and weight requirements. The reduced amount of heat generated by the power supply lessens the total cost of ownership, as thermal management is simplified.