I'm trying to build a timed fan, but I seem to be drawing more current from the battery than expected.
Not shown: 3.7V Li-Ion battery connected to a 5V boost converter (which is how I'm getting the 5V).
When D0 is disconnected from the BJTs (and resistors), I draw around 100mA from the battery and the Attiny begins to heat up to around 33-35 degrees. I've checked that there are no shorts anywhere, and when I completely disconnect the Attiny (ie pulled it out of its socket), the current draw drops to zero, so it seems like the Attiny is pulling 100mA for no apparent reason.
The boost converter is able to handle the load, as the output voltage remains at 5V so it's most likely not the boost converter.
Any potential reasons for this?