Other Parts Discussed in Thread: BQ2980,
Hi,
I designed a circuit with charging and battery supply where i put the Battery Protection circuit on the PCB and disconnect the bare battery.
It didn't work in the beginning (connecting a battery to the circuit didn't open the discharge FET) and I started debugging by measuring the gate voltages with an oscilloscope. Suddently the circuit worked as expected. A little further investigation i found the hint in the datasheet to add 5MOhms to the GS of both mosfet. This didn't help. But by accident I discovered, that when i short the gates with my finger the circuit works again.
So i soldered a 4.7MOhm resistor between the Gates (Cout and Dout) and everything works as expected. UVL and OVL is in spec, currents i didn't measure.
Can someone please explain whats going on here?