Hi - had to go back to the drawing board on a battery charger design.

I need to high side switch a 1.5VDC source into a resistive load. I was going to use a P-Channel mosfet, but having trouble finding one that will work below 3V on the source.

Gate signal from arduino nano so a PWM signal at 3.3V
I need to be able to switch 1 to 15V at 6 amps.

Is there any MOSFETs that anyone could recommend for this application? Preferably a PCB through hole package.

Thanks in advanced.

Hello! I am facing the same issue where I need to drive a p type mosfet at high-side to switch 1V power supply to a motor, with the drive voltage high enough to turn on the mosfet (~5V). Did you find any solution for it?

Mod: link to old thread
https://forum.allaboutcircuits.com/...-switching-at-low-voltage.175691/post-1588058

 

What is the control signal voltage? Where it comes from?

 

5V, microcontroller
I need the mosfet to conduct 200mA.
Also if it works then later i wish to vary the voltage from 4v to 8v to understand mosfet behaviour just for learning.

 

What is the control signal voltage? Where it comes from?

Sorry...a correction...
According to calculations we need to provide 6V to drive the mosfet to switch 1V, so consider we are driving it with 6V

 

If you can common the +1V and the +5V, then everything works. There can then be no connection of the - sides of the two supplies. Is that possible?

What is the reason for not switching the low side? That would be the more common way of doing this.

 

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If you have a two Mcu pin available use one (pin1) for 5V to 9V charge pump and second (pin2) for controlling the gate of N-ch mosfet.
The pump on schematic is designed for 10khz.
Run the pump a 2ms before you want to perform a switching.
You can run the pump all the time but 22kohm will drain it a bit (400uA only).


Note: You choose whatever gate voltage by placing a zener across 1uF capacitor instead instead of schottky diode.