Other Parts Discussed in Thread: TLV6700, TLV4021, TLV4011, TLV4062
Here is a circuit that we use:
The problem we see is that when the zener diode, D50, is conducting causing about ~3.5V on the input U11-4 and there is a transient on the board (not sure what pins on U11 see a transient because I haven't been able to capture this yet) the output, U11-6 (SW_BAT_OFF) goes high and stays high even when the input, U11-4 remains at 3.5V. The only way to get the part out of this latched state is to remove the power on U11's VDD pins.
My question is - what could cause the IC to get latched in the high impedance output state? It's almost like it's stuck in UVLO mode. I know that putting 3.5V on the input is not recommended but is this really going to cause the part to latch in a high impedance ouput state? Thank you.