why linear drivers (inefficient and limited current) are so popular?

As mentioned, some of us (Mike C and myself, at least) are actively working with this chip.

Mike C’s thread

And a few of my recent designs (not promised to be perfect, still in testing… please don’t order unless you feel like gambling): 3A single sided, 17mm and 5A single sided for Emisar D1S

Interesting chip, but not a direct replacement for the 7135. More powerful and flexible, for sure. But it also has a slightly higher voltage drop. And if anyone knows of any chips similar to the 7135 / CN5710 / CN5711… feel free to share (or PM)!