I designed a prototype circuit for my MSP430 and other components. It is powered by two voltage regulators and a current source. What confuses me is that after I remove the battery power (4.2V) from the circuit, it does not turn all the way off. V+ drops to 500mV and then drops so slowly that it seems permanent. After 5 minutes, it's still 350mV. Is this normal behavior?
I am a newly graduated bioengineer trying to do the job of an EE, so I'm sorry if this is a totally stupid question. I have no idea what is happening! I have an experimenter's board from TI (that I copied very closely for my circuit, especially the decoupling capacitors). I am tempted to just add a huge resistor between V+ and V-, but I figured that that would be a bad plan.
Any help is much appreciated!