Load Switches

MOSFET Based

The following image shows a MOSFET based high-side switch:

A high-side load switch made from a N-Channel and P-Channel MOSFET.
A high-side load switch made from a N-Channel and P-Channel MOSFET.

IC Based

The following image shows an IC based high-side switch.

The TPS27082LDDCR, a high-side load switch IC.
The TPS27082LDDCR, a high-side load switch IC.

Some load-switches have reverse-polarity protection. More information of how they exactly implement reverse-protection with only the one MOSFET can be found in the The Substrate (Body) Connection section of the MOSFET page.

A functional diagram of the NCP380 high-side load switch. Note the switches connected to the MOSFET substrate which show how reverse-current protection is performed.
A functional diagram of the NCP380 high-side load switch. Note the switches connected to the MOSFET substrate which show how reverse-current protection is performed.

 

Posted: November 8th, 2013 at 2:04 pm
Last Updated on: May 13th, 2015 at 5:43 pm