Charge-controlling semiconductor integrated circuit and charging apparatus

A charge-controlling semiconductor integrated circuit comprising:

• a current-controlling MOS transistor connected between a voltage input terminal and an output terminal, which current-controlling MOS transistor controls current flowing from the voltage input terminal to the output terminal;
• a substratum voltage switching circuit connected between the voltage input terminal and the output terminal, and a substratum of the current-controlling MOS transistor, wherein an input voltage or an output voltage is applied to said substratum,
• a voltage comparison circuit to compare the input voltage and the output voltage, wherein the voltage comparison circuit is configured to include an intentional offset in a first potential direction;
• and
• a level shift circuit to shift the output voltage to a potential direction opposite to the first potential direction,
• wherein:
• a voltage from the level shift circuit is input to a first input terminal of the voltage comparison circuit,
• the input voltage is input to a second input terminal of the voltage comparison circuit, and
• the charge-controlling semiconductor integrated circuit is configured to control the substratum voltage switching circuit based on an output of the voltage comparison circuit, such that:
• the substratum voltage switching circuit applies the input voltage to the substratum of the current-controlling MOS transistor when a sum of the voltage of the first input terminal and the intentional offset is lower than the voltage of the second input terminal, and
• the substratum voltage switching circuit applies the output voltage to the substratum of the current-controlling MOS transistor when the sum of the voltage of the first input terminal and the intentional offset is higher than the voltage of the second input terminal.