CXLB73219 is a perfect monolithic Li-ion battery constant current/constant voltage linear power management chip. Its thin size and small outer packaging make it convenient for portable applications. What's more worth mentioning is that CXLB73219 specifically designed the power supply specifications for USB.
Thanks to the internal MOSFET structure, external resistors and blocking diodes are not required in the application. The charging voltage is limited to 4.2V and the charging current is regulated by an external resistor. After reaching the target charging voltage, when the charging current is reduced to 3/10 of the set value, the CXLB73219 will automatically end the charging process. When the input terminal (plug or USB power supply) is unplugged, the CXLB73219 will automatically enter a low current state, and the battery leakage current will drop below 1μA. The CXLB73219 can also be set to a stop state, so that the power supply current drops to 25 μA. The CXLB73219 has a built-in battery reverse connection protection circuit to ensure that the chip automatically enters the protection state when the battery is reversed, and to ensure that the IC is not broken down and the battery self-discharge causes an accident. Other features include: charging current monitoring, input low voltage blocking, automatic recharging and flags for full charging and starting charging.
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[ CXLB73219 ]"
