We are using the LT8610AB as a primary 5V regulator with its PG open-drain output used to enable/disable downstream regulators. This is done via a 100kOhm pull-up resistor (R2) to the regulators 5V output.
During testing we have found that the addition of a 470nF ceramic capacitor (C3) effectively helps prevent any nuisance PG resets caused by glitches that may appear on the 5V rail.
So I am wondering if this is acceptable considering that there are no maximum energy limits specified in the datasheet for the PGOOD open-drain?
- The above circuit will sink (1/2*C*V^2) = ~5.9 uJ into PG. Duty cycle will be very low.
- Other low drain current nmos transistors typically specify max drain ratings at 3A for 300us (or 900uC) (e.g. https://www.diodes.com/assets/Datasheets/BS170F.pdf) which is significantly higher than 5.9 uJ
Thanks for any updates.