English 
MM3635 is a charge control IC suitable for low-capacity battery.
It can charge from a battery voltage of 0 V, making it ideal for products using low-capacity batteries.
Charge control voltage can be set according to the battery used (4.2 or 4.05V)
The MinebeaMitsumi lithium battery management circuits are made in Japan and are of the highest quality. They will be perfectly suited for your applications.