Take MST4210 as an example, it is a constant current and constant voltage linear charging chip.
The chip uses constant current\/constant voltage charging mode to charge the lithium battery.
The maximum charging current can reach 1.1A, the chip can withstand up to 28V, and the overvoltage protection voltage is 6.8V or 10.5V.
Charge current and cut-off current (EOC) can be adjusted by external resistance.
When the battery voltage is below 2.55V, the chip enters a precharge state and the charging current is 18% of the constant current charging (CV) current.
In the constant current charging (CV) state, when the charging current is less than the cut-off current (EOC), the \/C\/H\/G port will display status.
The product has a constant temperature charging function, and adjusts the output current according to the chip temperature feedback to ensure that the chip works in a safe temperature range.