Been playing with this buck/boost voltage regulator. Powered by a 3.8V (nominal) 250F Lithium Ion Capacitor (Vin). Putting out 3.3V (Vout…although measuring the output voltage with a DVM it is more like 3.33 volts) to two leds that have current limiting resistors. Low voltage cutoff set at ~ 3.0V (V at enable pin set to 0.7(3.8/3.0). Operating as expected except…
When the voltage of the capacitor (Vin) has decreased to below (e.g. 3.29 volts) the 3.3V output of the regulator (Vout), the regulator continues to put out 3.3V, as expected. When I touch the Vin terminal with the positive probe of my DVM (intending to check on the voltage level of the capacitor) the regulator shuts off Vout.
To be clear, when I touch the Vin pin of the regulator with the positive probe of my DVM, I have not yet touched the GND pin with the negative probe of the DVM.
Possible explanations?