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Driving a logic level MOSFET with an ATtiny 3224 (thelemmy.club)
submitted 2 months ago* by to c/askelectronics@discuss.tchncs.de
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I'm tinkering with the ATtiny 2 series (ATtiny 3224). I'm also starting to teach myself about switch mode power and surface mount design. I'm planning to drive two Toshiba SSM6K804R MOSFETs. They are logic level MOSFETs with a 4.5V drive. They have a gate capacitance of 1110pF (1nF).

Even though these are logic level MOSFETs, I think I still need an external gate drive for them for crisp switching above a few kHz. I don't need to try and charge the gate directly with the ATtiny as I would need a 2-300ohm resistor in series to protect the microcontroller and that will slow everything down. Also need a pulldown for the gate.

Can someone please recommend a simple IC or maybe a packaged transistor pair that I can slam the gates with?

Questions/comments/advice greatly appreciated!!

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[–] 3 points 2 months ago (1 child)

Not a electrical engineer, so dunno the answer.

Can always just try that test circuit and investigate with a scope? Or play around with SPICE? I imagine any low capacitance mosfet would work as a driver?

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  • [–] [S] 1 point 2 months ago

    I was thinking bjt or opamp to drive the mosfets, but I'm not sure.

    And yeah, I'll be scoping it as I start testing. I'm just still wrapping my head around the synchronus inverting buckboost I think I want to use.

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