INTEGRATED CIRCUIT WITH POWER LOSS PROTECTION FUNCTION

An integrated circuit with power loss protection function, including a bus terminal configured to provide a bus voltage, an energy storage terminal configurable to be coupled to a power loss protection capacitor, a charging circuit coupled between the bus terminal and the energy storage terminal, and a capacitance monitoring circuit. The charging circuit includes a first charging path, and based on the bus voltage, provides a first constant charging current to charge the power loss protection capacitor during a first constant charging period in a startup process of the integrated circuit. The capacitance monitoring circuit monitors the voltage across the power loss protection capacitor in the charging period of the startup process of the integrated circuit to obtain a parameter for calculating the capacitance value of the power loss protection capacitor.