Hi E2E,
I'm trying to make an ultra-low-power voltage supervisor with discrete parts (comparator, voltage ref...) for a customer.
I'm coming from this E2E post which looked at single-IC solutions. In short, I need a voltage supervisor with:
- Ultra-low power (<1uA)
- ~100mV hysteresis
- Negative-going threshold voltage somewhere within 2.3V to 3.08V.
The TPS3839L30 (and family) fits all specs except for hysteresis (in the 20s of mV)
The LM8365 (and all other parts) don't fit the power budget.
I've read through How To Implement Voltage Monitoring and it states that the lowest power option would be the parts shown above, but another option would use discrete parts (comparator, voltage reference...). The TLV3691 has an Iq of 150nA, but the lowest current voltage reference I found pulls around 3uA.
In your experience, is there any way we can hit these specs?
Thanks,
-Sam