Dear Analog Devices
Is there a theoretical upper limit to the efficiency of a dc-dc buck converter ?
For example, Vin=5V to 1.8V at 1-to-2 A operating at 4MHz
Thanks any advice appreciated,
The efficiency will be limited by the losses in the inductor and the buck regulator. The inductor loss will depend on the inductor type, and DCR values of the chosen inductor. The buck regulator losses will depend on the switching, transition and FET conduction losses, these also depend on the specifications of the Buck regulator that you'd use. At these load currents and high switching frequency, you'd expect the losses to increase. Although, a good design can still give you around 90% efficiency.
We don't have a 4MHz Buck regulator, but if that requirement can be stretched, you may check the ADIsimPower page to enter your design requirements and see possible parts you could use. You can also click on the "download tool" icon to run your design and see what the calculated efficiency look like based on actual components.
Power Design Tool: Power Management: ADIsimPower by Analog Devices
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