The TP4054 is a complete single-cell ion battery using a constant current/constant voltage linear charger SOT package. Less external component count enables

TP4054 is ideal for portable applications

TP4054 can be used as USB power supply and adapter power supply. Due to the use of internal PMOSFET structure, the anti-reverse charging circuit requires external sense resistors and isolation diodes to heat-feed the charging current to adjust the charging current to limit the charging voltage under high-rate operation or high ambient temperature conditions. Fixed at 4.2V and the charge current can be set externally by a resistor. When the charge current drops by 1/10 of the set value after reaching the final float voltage, the TP4054 will auto-complete the charge cycle when the input voltage AC adapter or USB power supply is removed When the TP4054 enters a current state, the battery leakage current can be reduced by 2uA. It can also put the TP4054 in shutdown mode to reduce the supply current by 45uA. Other features of the ATP4054 include a charge current monitor, self-recharge, and an indicator to indicate end of charge and Status pin for input voltage access,

Features

Programmable charge current up to on-chip 00mA No MOSFET sense resistor or isolation diode required Complete linear charger in SOT23-5 package for single-cell ion batteries Constant current/constant voltage operation and can operate without overheating danger Thermal regulation for maximized charge rate in case of actual charge rate Charge single-cell ion battery directly from port B Recharge, charge status output pin, C/10 charging end, standby mode supply current is 4 uA 23 packages