Hello,
I have a project that has two CR2450 in parallel. These batteries can be inserted backwards so I need to protect for that. I am looking at using two LM66100, one for each battery.
Here is the circuit I am looking at using. VIN1 and VIN2 are the CR2450s.
I ordered and received the LM66100EVM. I configured to match the circuit above. It seems to work for the most part however these is one case where it seems to fail. Using the circuit above for reference, if I correctly insert good(3V) batteries into both VIN1 and VIN2, things function as expected. Now if I removed the battery from VIN1 then insert at discharged(<2.5V) battery, current starts flowing from Vout back into the discharged battery at VIN1. I can insert the discharged battery correctly or backwards and current still flow into the the discharged battery however when inserted backwards more current flow into the discharged battery.
It seems that VIN1 stays high even after the good battery is removed. Then when a discharged battery is placed in, it doesn't have enough capacity to left to drive the input low and turn off the device. Is there any way to prevent this?
If the LM66100 wont work for this scenario do you have other suggestions? Due to the load profile, both batteries must be connected at the same time to help reduce the current pulses seen by each battery. I also considered actual diodes but the voltage drop was too high.
