Author Topic: MAX9722 will not work without 1uF on PVss  (Read 699 times)

todd.dukes

MAX9722 will not work without 1uF on PVss
« on: April 16, 2019, 09:21:41 AM »
I don't know how I missed in from the data sheet, but I had a lot of trouble getting the charge pump to work on the MAX9722. They do have at least one schematic that shows a 1uF cap from PVss to ground (pin 7 on TSSOP)

I hope this helps anyone wanting to try this chip.

It works well with this cap. It doesn't work at all without it. I am using this with the 78L05, but have some 7805 on order to use in the final project. The TSSOP is small but I got it soldered ok using the Kester 186 and some solder wick.

Here is the second one I soldered: