Author Topic: NPN driving P MOSFET on a chip  (Read 986 times)

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Offline rea5245Topic starter

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NPN driving P MOSFET on a chip
« on: June 13, 2019, 08:22:52 pm »
Hi,

When switching a P-channel MOSFET from a microcontroller, you typically do it through an NPN. It's so common that it would be nice if NPNs and P FETs were packaged together on a chip, sort of like a Darlington transistor. Is there such a beast?

Thanks,
   Bob
 

Offline Yansi

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Re: NPN driving P MOSFET on a chip
« Reply #1 on: June 13, 2019, 08:25:25 pm »
You haven't done your (googling) homework, have you?

There is a metric crapton of high side switches, from the most stupid ones like UDN2981 or BSP450 up to quite smart ones for Automotive (for example VND7020) and Industrial applications (VNI8200XP)

//EDIT: Typo
« Last Edit: June 13, 2019, 08:27:45 pm by Yansi »
 

Offline rea5245Topic starter

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Re: NPN driving P MOSFET on a chip
« Reply #2 on: June 13, 2019, 08:37:25 pm »
I googled plenty for NPN driving P MOSFET and I looked on Digi-Key at transistor arrays. What I didn't know was the magic words "high side switch".

Thank you.
 

Offline Yansi

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Re: NPN driving P MOSFET on a chip
« Reply #3 on: June 13, 2019, 08:41:02 pm »
It is likely you could even find N and P mosfet combos in a single package, with various levels of resistor integration.

Not sure off-hand about any, haven't used any of those in my designs, but have seen such.
 

Offline rea5245Topic starter

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Re: NPN driving P MOSFET on a chip
« Reply #4 on: June 13, 2019, 09:21:14 pm »
I wish I could find those combos. I've found the CTA2N1P but nothing else. And it's discontinued at Digi-Key, which is a little worrisome. (Mouser still has it though.)
 

Offline Yansi

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Re: NPN driving P MOSFET on a chip
« Reply #5 on: June 13, 2019, 09:36:19 pm »
There has to be a lot more of those, small signal and medium power.

Look for example here: https://cz.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1z0xz4pZ1yrzaht

And don't get fixated that the low side has to be NPN.  N-MOS would be preferred there - less current consumption.
 


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