Hi,
The datasheet for TPS62112 says "the reverse leakage current is specified under electrical characteristics", but I couldn't find it there. Does anyone know what it is? Also, is my understanding correct that this is the maximum current that will go from output to input in case the input is disconnected and the output is driven?
Also, would like feedback on the following idea: I need to drive a line with 5V either from the TPS or from an external source. I need the TPS to take precedence when it has input power. I'm putting a PNP between the external source and the output, and the gate will be pulled down, and then driven by something that says "TPS is working" to disable the external source. So far so good, but the standard circuit for that feeds the base from TPS output, and a diode is required. But I cannot tolerate its voltage drop.
So my idea was to drive the base from the TPS input. Only problem is that if the input is disconnected and the output is 5V, current will leak. Will a simple resistor (small enough) from Vi to GND do the trick, i.e. ensure that the input voltage is small when it is disconnected?
Thanks!