Totem pole basically an output driver circuit use to convert one level of voltage into another level of voltage.
For example, you want to drive gate of MOSFET with the help of microcontroller output pin.The microcontroller output pin is generating a square wave of voltage level 5 volt and to fully drive mosfet gate of P-channel mosfet you need to provide 12 volt at the gate of p-channel mosfet. To solve this problem you can use totem pole. As shown in figure below
Totem pole circuit diagram
Video lecture on totem pole
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