MOTF690-ES is an excellent high-voltage boost type constant current/constant voltage linear charging IC for 2-cell lithium-ion batteries. It can be powered by USB power or adapter power 5V. It has built-in power MOSFET, detection resistor and isolation diode. It has thermal regulation function, which can maximize the charging rate without the risk of overheating. The charging cut-off voltage is 8.4V, and the charging current can be set by an external resistor. When the charging current drops to 1/10 of the set value, the chip will automatically terminate the charging cycle. In addition, there are functions such as battery temperature monitoring, undervoltage lockout, and automatic recharging.