The reason is that the charger output specifications do not match the mobile phone. The small power charger of the cottage, the current is not enough, will be pulled by the mobile phone, the charger repeatedly jumps between the start and pull, and the impact is easy to damage the charging IC. Too high output voltage exceeds the phone charging IC withstand voltage value, will also be damaged)
The input voltage polarity is not correct or reverse: the standard excuse is generally difficult to plug, and the possibility of reverse this is, but not high.
There are three reasons for power management chips to burn out:
3 Power supply voltage is too high!