This IC talks to the charger before allowing it to charge the phone, and often causes slow charging, no charging, or death after being plugged into a fake charger.
U6300 on iPhone 8/8+, also works on iPhone X
NXP1612A1
This IC talks to the charger before allowing it to charge the phone, and often causes slow charging, no charging, or death after being plugged into a fake charger.