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8 channel fet driver

I'm looking for an 8 channel fet driver with input range to 5 volts and output to 10 volts? Sink & source current of 25 ma. or greater is adequet. The 74ac541 has worked well with "logic level" fets but is, obviously, no good when higher voltages are needed. A similiar device from the 4000 series would work if output currents were in the 25 ma. range. Two quad opamp packages with high current rail to rail outputs would fit but with questions about input biasing, startup variances, etc. Two channel fet drivers in the 1 amp & up range abound, but are costly in both price and surface area. Any suggestions for an 8 channel device, or maybe a 4 channel one, with an output in the 25 ma. range?

Hul

Reply to
Hul Tytus
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I've happily used 40109 quad level shifters to drive 12V gates from 5V logic fast enough for slow apps but not sure if they satisfy your 25mA output. I reckon the output device Rdson is one or two hundred ohms so they could probably source/sink that much only at the beginning of each transition when full supply voltage briefly appears across their output device. That may be fast enough for you, depending on gate charge. What kind of FETs are you driving and how fast a transition do you want?

piglet

Reply to
piglet

formatting link

"octal mosfet driver" turns up nothing in their search- but it's Texas so maybe I needed to enter "oktul mossfet dryver"...

Reply to
bloggs.fredbloggs.fred

The quad opamp thing sounds good and cheap. Common all the inverting inputs and run them to some voltage that sets the logic threshold and takes care of enable/startup.

Digikey shows a bunch of quad mosfet drivers, starting around $1 in quantity, not stocked of course.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics
Reply to
John Larkin

Sounds rite.

Hul

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Reply to
Hul Tytus

Thanks John. That may lead elsewhere.

Hul

John Lark> > >sci.electronics.design

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Hul Tytus

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