Shut Down a Current-Sense Amplifier via Its Supply Pins

Abstract: You can shut down a current-sense amplifier by connecting an NMOS transistor in its ground path and driving it with logic-level signals capable of turning the transistor ON and OFF. When ON the amplifier operates normally, but when OFF it shuts down because its ground is floating.
Maxim > App Notes > Amplifier and Comparator Circuits
Keywords: current-sense amplifiers, battery operation, NMOS transistors, shutdown Dec 10, 2010

APPLICATION NOTE 4544
Shut Down a Current-Sense Amplifier via Its Supply Pins
By:Arpit Mehta
Prashanth Holenarsipur


Abstract:You can shut down a current-sense amplifier by connecting an NMOS transistor in its ground path and driving it with
logic-level signals capable of turning the transistor ON and OFF. When ON the amplifier operates normally, but when OFF it
shuts down because its ground is floating.

A similar version of this article appeared in the November 11, 2007 issue of Power Electronics Technology magazine.

Unlike traditional op amps, the high-side current-sense amplifier doesn't include a