LT8610AB PGOOD de-bounce capacitor

Question

Hello! 
 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? 
 Notes : 
 
 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.

ADIApproved · Accepted Answer

Hi, 
 Thanks for the information and application of LT8610. 
 Yes, the current rating is close to that level. The PG pull-down resistor limits the current flowing through the PG internal transistor. 
 The 470nF cap at PG pin should be good. 
 Best regards, 
 Andrew)