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MAX6460 Production
The MAX6457â€“MAX6460 high supply voltage, low-power voltage monitors operate over a 4V to 28V supply voltage range. Each device includes a precision bandgap...
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MAX6460 on Analog.com

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MAX6460 Simulation model

lucas84

on Sep 4, 2025

Category: Datasheet/Specs

Product Number: MAX6460

I have a couple of questions regarding the MAX6460 simulation model, where the simulation model behaves different from what I would have assumed looking at the datasheet. I am planning to use the chip as an overvoltage detector. So Ref connects through a voltage divider to the In- pin and the voltage I am monitoring is connected through a voltage divider to the In+.

It appears that the reference voltage at the ref pin is around 1.32V, while according to the datasheet it should be around 2.25V
It seems like the In+ pin clamps the voltage to the reference voltage. Is this how the actual chip will also behave?

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MStokowski

on Sep 5, 2025 11:44 AM
0
Hi lucas84 ,

Do you have test schematic that shows these results? I would suggest zipping up your schematic files uploading to this thread, and also report the problem here.

mike (LTspice Team)
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lucas84
on Sep 5, 2025 1:35 PM in reply to MStokowski
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Hi Mike,

Thank you for your response. I am using ngspice (with KiCad) for simulation. But I am pretty confident the behaviour could be replicated in LTSpice. This is my test circuit which is close a circuit from the datasheet (page 9).

The output I am getting is as follow:

The following is not what I expect:

- I would have expected "ref" to be 2.25 V

- I would have expected V(in-) to be the input negative input of the comperator, instead it seems it is "ref"

- I didn't expect that V(in+) to be clamped slightly above (Vin-)
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