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to check possiblity to use LP2951-ADJ in our system.

Other Parts Discussed in Thread: LP2951

I'm now considering LP2951-ADJ for using 3.3V.

But, I have to connect 2.8V from another power source to the output-end of LP2951. And then LP2951 will be turned on and off.

Is it possible to use as I wrote?

please refer to the attached block diagram what I'm going to design.