LM317 vregs using MOSFETs

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Jeff Birkle

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Hello,
I'm wondering why no one uses MOSFETs instead of a Transistors for high amp, voltage regulation circuits?
Or am I just not finding it?
 
The problem is that MOSFETs generally require a high gate-source voltage to turn on which increases the minimum voltage drop across the regulator. For many regulator applications you want to minimize the drop to reduce power dissipation.
 
Jeff Birkle said:
Hello,
I'm wondering why no one uses MOSFETs instead of a Transistors for high amp, voltage regulation circuits?
Or am I just not finding it?
Click to expand...

hi,
It can be done using a P MOSFET say a IRF7404 which has very low gate turn on voltage. It would require the usual large heatsink.
 
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