We use the TPS62737 in a Remote Control providing. With 3x AA cells it works in range of Ubat=4.6V to 3.0V. Output voltage is 1.8V. Vin_ok is programmed to 2.9V.
R1=5M6, R2=3M3, R3=4M7 as calculated with the provided excel sheet.
Below 2.9V the Remote Control should "power off" (irreversable) with a low bat indication. This means if "Vin_ok" turns to low a single time, the Remote Control is in low bat state for the rest of the time.
Due to the extremly high resitance the voltage devider is very "touch-sensitive" and the programmed "power off" threshold and Vout can be shifted "manually". In the hausing there are no conducting parts near the external resistors, but it happend several times that batteries seemed to be empty (Low Bat LED indication).
I am afraid this happens due to ESD, moisture or maybe Flux residues.
I think about partial coating of this circuit and also decreasing the external resistort.
What else could I do
