The lithium battery charger is a charger specially used to charge lithium ion batteries. Lithium-ion batteries have higher requirements for chargers and need protection circuits. Therefore, lithium-ion battery chargers usually have higher control precision and can charge lithium-ion batteries with constant current and voltage.
The lithium battery charger has the functions of overvoltage protection and temperature protection. The lithium battery charger is externally connected with a current-limiting charging power supply and a P-channel field effect transistor, which can safely and effectively charge a single lithium battery. Its biggest feature is that it is not in use Low power dissipation can still be achieved in the case of inductance, and it is packaged in 8-pin μMAX. The charging control accuracy is 0.75%, pre-charging can be realized, the longest charging time is limited to provide secondary protection for the lithium battery, and the floating charging method of the lithium battery charger can maximize the battery capacity.
　　 Lithium battery charger can automatically detect the charging power source, and automatically shut off when there is no power source to reduce battery leakage. After starting the fast charge, turn on the external P-type FET. When it is detected that the battery voltage reaches the set threshold, it will enter the pulse charging mode. The P-channel FET will be turned on for shorter and shorter periods of time. When the charging is over, the LED indicator light It will flash at 12% cycles. When the charging power supply and battery are within the normal operating temperature range, inserting the battery will start a charging process; the condition for the end of charging is that the average pulse charging current reaches 1% of the fast charging current, or the time exceeds the on-chip charging time.