Folks,
coming back to the TPS2066 Enable Pins:
We want to use the device as a simple Undervoltage Protection Switch. Our external supply is a One Cell LiIon battery, which works properly in a range of 3.0 to 4.2 Volts. This source is connected to pin 2 (Input) and parallel to pin 3 (EN1). Our idea is that the battery voltage will be passed to the output OUT1 as long as the battery voltage is higher than 2.7 volts.
We tested three different TPS2066 devices but all show the same behavior: If the battery voltage falls below 3.6 volts, the switch turns off. After the battery voltage will be increased above 3.8 volts, the switch will turn on again.
The output load is very small, approx. 20 mA, and connected capacitors are only 10 uF. The output load is mainly a 3.3V LDO and a microcontroller behind it, but even if we put the micro into permanent reset state (so only DC current will appear), the behavior is still the same...
What are we doing wrong?
Thanks and best regards,
Ulf