Semiconductor integrated circuit, protection circuit, and battery pack

A semiconductor integrated circuit for protecting a secondary battery, the semiconductor integrated circuit comprising:

• a control circuit configured to turn on and off a discharge control switch for discharge control of the secondary battery and a charge control switch for charge control of the secondary battery;
• a regulator including an output terminal and configured to generate a voltage supplied to another semiconductor integrated circuit;
• a switch connected to the output terminal of the regulator;
• a pull-down resistor connected to the switch;
• and
• a leak detection circuit configured to
• detect a leak current generated in the semiconductor integrated circuit, and
• turn on the switch when the leak current is detected so that the pull-down resistor is connected via the switch to the output terminal of the regulator and the voltage output from the output terminal of the regulator is pulled down by the pull-down resistor.

A protection circuit for protecting a secondary battery, the protection circuit comprising:

• a discharge control switch for discharge control of the secondary battery;
• a charge control switch for charge control of the secondary battery;
• a first semiconductor integrated circuit configured to turn on and off the discharge control switch and the charge control switch;
• and
• a second semiconductor integrated circuit configured to be supplied with a voltage from the first semiconductor integrated circuit,
• wherein the first semiconductor integrated circuit includes
• a regulator including an output terminal and configured to generate the voltage supplied to the second semiconductor integrated circuit,
• a switch connected to the output terminal of the regulator,
• a pull-down resistor connected to the switch, and
• a leak detection circuit configured to
• detect a leak current generated in the first semiconductor integrated circuit, and
• turn on the switch when the leak current is detected so that the pull-down resistor is connected via the switch to the output terminal of the regulator and the voltage output from the output terminal of the regulator is pulled down by the pull-down resistor.