I have a circuit with one unused op-amp in a dual RC4558P. It is single supply from a 9V battery. I noticed the unused op-amp had all three pins left floating.
In order to minimise current consumption, I connected it up as described here -
http://e2e.ti.com/blogs_/archives/b/thesignal/archive/2012/11/27/the-unused-op-amp-what-to-do
i.e. as a follower with 4.5V on the non-inverting input.
The current consumption actually increased by 1.4mA.
Furthermore, if I instead connect the non-inverting input of the follower to 0V or to 9V, the current consumption goes back down again.
Is the rise in current consumption to be expected in this "best practise" configuration?
If so, is there a better way to connect an unused op-amp to minimise current consumption?