Is this the best choice?

A project log for OpAmp Buck Regulator

A quad OpAmp Makes a Buck Regulator

aaron-lagerAaron Lager 05/21/2023 at 20:490 Comments

Well, after many investigations, it would appear that this opamp pulls a lot of current when it is oscillating.  The sim agrees with reality in this regard too.

So, while it is a great regulator, and has great transient response, it is not efficient at all.  It is probably worse than most modern LDO chips.