Charging Circuit of MAX1879

Published:2011/7/19 11:04:00 Author:Michel | Keyword: Charging Circuit | From:SeekIC

The above picture is charging circuit of MAX1879.When the power is switched on,precharging circuit conducts and LED blinks when the battery voltage is 2.2~2.5V.As the battery voltage is more than 2.5 V, the circuit turns into fast charging way and exchange adapter is used to limit battery charging current. As it is fast charging, LED blinks. If the battery voltage rises to 4.2 V, then it turns into pulse charging ways. The pulse minimum charging time is set by TSEL terminal. If the ratio of VT1 conduction time and the cut-off time are less than 1/8, it is judged as the longest time charging ways.6.25h timer starts and it keeps pulse charging ways and the timing time ends until the charging is over.



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