Other Parts Discussed in Thread: TPS3710
TPS62125 (powered with a 16.5V battery and configured for V_OUT=3.3V) has a PG pin to test output voltage but no Low Battery Indicator (LBI). As I have very tough space and target price constraints I cannot use a separate voltage detector (e.g. TPS3710) to test if nominal battery voltage (16.5V) falls below a predefined threshold (e.g. 15V).
It seems anyway that EN_YS pin could be used as an LBI, As described on the datasheet it is an open-drain and is pulled to GND when 'voltage on the EN pin is below the comparator threshold V_TH_EN_ON of typ. 1.2 V'. In particular 'The pin is pulled to GND once the falling voltage on the EN pin trips the threshold V_TH_EN_OFF (1.15 V typical)'.
So, if I connect EN pin to V_IN through a 1.2M resistor and to GND through a 100k rsistor, I expect that EN_HYS pin (simply pulled-up to 3.3V with a 20kohm resistor) is pulled to GND whenever V_IN falls below 15V, working as an LBI (of course while TPS62125 is still enabled and continues to regulate). Is this correct or cannot it work like this for some other reason?
Many hanks in advance.