Hi!
I made the mistake of mixing up the GND and EN pins of the TPS62200DBVR in my design, however the IC still works. It gets the "DCDC_EN" signal to its GND pin and the EN pin is directly connected to the GND plane as seen on the attached schematic. The "DCDC_EN" is on the same potential when active as the Voltage Input pin of the IC, so if I understand correctly when I mixed up the 2 pins, that means, whenever there is a "DCDC_EN" the GND pin is on the same potential as the Voltage Input pin meaning there should be no voltage between the IC's ground and input and the EN pin should be on negative voltage. Suprisingly the circuit works perfectly and it generates the required voltage despite of the fact, that the input voltage should be 0V. I observed the output signal via an oscilloscope and I haven't experienced any anomalies, everything works as if I haven't mixed up the pinout (I corrected it, and it works the same). The device which contains this circuit with the wrong wiring has been working for two months non-stop without any noticeable error. I already confirmed that the IC works, it is not the LDO which provides the voltage when more current is required beacuse it turns off when the DCDC_EN signal is active. Could you please provide an explanation why the TPS62200DBVR is working despite of that it is wired wrong and what behaviour should I expect from it?
