English 
MM3658 is a linear charge control IC for 1-cell lithium iron phosphate (LiFePO4) battery.
The chip temperature detection function can limit the temperature rise in the IC during high power charging.
It also allows the temperature of the charge to be monitored.
The package is a small size SSON-10pin.
The MinebeaMitsumi lithium battery management circuits are made in Japan and are of the highest quality. They will be perfectly suited for your applications.