Product Name: Charging IC for Xiaomi Mi 9 – SMB1390
Compatible Model: Xiaomi Mi 9
Material: Integrated circuit (IC chip)
Function:

Control and regulate charging current
Fix no charging or unstable charging issues
Protect battery from overcharging and overheating
Ensure efficient power management
Model Number: SMB1390
Included: Charging IC only
OEM Style: Yes – precise compatibility and performance