Push On – Push Off Soft Latching High Side Switch.

When you press the button, the circuit toggles its state: if it’s on, it turns off; if it’s off, it turns on. You can also turn it off by applying voltage to the shutdown pin. In the off state, it draws virtually no current — I couldn’t even measure it, as it’s below 1 microamp. This makes it ideal for battery-powered devices. When your device is off, it consumes zero power.

You can also trigger the shutdown pin via an Arduino or another microcontroller, allowing the device to turn itself off automatically once its task is complete.

Circuit diagram and component values:

PCB layout:

 

Interactive circuit diagram:

http://tinyurl.com/ydeme9lq