About FS4054 lithium battery charging

The FS4054 is a complete single lithium-ion battery with a constant current/voltage linear charger. Charging current up to 500mA,

The SOT - 25 packages with less number of external components makes TP4054 ideal for portable applications. FS4054 can work for USB power supply and adapter power supply. With internal PMOSFET architecture, coupled with the charging way, so do not need external testing resistor and isolation diodes. Thermal feedback can be adjusted to the charging current, so that under the condition of high power operation or high ambient temperature on the chip temperature limit. The charging voltage is fixed at 4.2v and the charging current can be set externally through a resistor. When the charging current is reached the final float charging voltage to set data after 1/10, FS4054 will automatically terminate charging cycle. When the input voltage (ac adapter or USB power supply) is removed, the FS4054 automatically entered into a state of low current, will be the battery Leakage current dropped to under 2 ua. It is also possible to put the FS4054 in shutdown mode to reduce the power supply current to 45uA. TP4054 monitor other features include charge current, under voltage lockout, automatic recharge and a used to indicate the charging end and input voltage access the state of the pin, can be single or double lamp lights.

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