Over voltage and over current protection integrated circuit

An integrated circuit, comprising:

• a primary input for receiving an input voltage;
• a battery voltage input for receiving a variable battery voltage level defining a current voltage level to which a battery is charged by a regulated charging voltage;
• an output for providing an output voltage higher than the variable battery voltage level to a battery charger for generating the regulated charging voltage for charging the battery;
• first circuitry responsive to the input voltage for generating an input over voltage control signal responsive to a determination that the input voltage exceeds an input over voltage limit;
• second circuitry responsive to the variable battery voltage level for generating a battery over voltage control signal responsive to a determination that the variable battery voltage level exceeds a battery over voltage limit;
• and
• a switch connecting said primary input to said output, wherein said switch is responsive to the input over voltage control signal for controlling said switch to disconnect the primary input from the output when the input voltage limit is exceeded by the input voltage and further wherein said switch is also responsive to the battery over voltage control signal for controlling said switch to disconnect the primary input from the output when the battery over voltage limit is exceeded by the battery voltage level.

An integrated circuit, comprising:

• an input node configured to receive an input voltage;
• an output node configured to be coupled to a battery charger that is configured to charge a battery;
• a sense node configured to receive a battery voltage across the battery;
• a switch coupled between the input and output nodes and configured to conduct a switch current;
• and
• logic circuitry coupled to the input node, sense node, and switch, and configured to open the switch in response to at least two of a magnitude of the input voltage exceeding an input-voltage threshold, a magnitude of the battery voltage exceeding a battery-voltage threshold, and
• a magnitude of the switch current exceeding a switch-current threshold.

A system, comprising:

• a battery charger having a charger input node, and having a charger output node configured to provide a charging signal to a battery;
• and
• a protection circuit, including a protection-circuit input node configured to receive an input voltage, a protection-circuit output node coupled to the charger input node, a sense node configured to receive a battery voltage across the battery;
• a switch coupled between the protection-circuit input and output nodes and configured to conduct a switch current;
• and
• logic circuitry coupled to the protection-circuit input node, the sense node, and the switch, and configured to turn off the switch in response to at least two of
• a magnitude of the input voltage exceeding an input-voltage threshold,
• a magnitude of the battery voltage exceeding a battery-voltage threshold, and
• a magnitude of the switch current exceeding a switch-current threshold.

A system, comprising:

• a battery configured to generate a battery voltage;
• a battery charger having a charger input node, and having a charger output node coupled to the battery;
• and
• a protection circuit, including
• a protection-circuit input node configured to receive an input voltage,
• a protection-circuit output node coupled to the charger input node,
• a sense node configured to receive the battery voltage;
• a switch coupled between the protection-circuit input and output nodes and configured to conduct a switch current;
• and
• logic circuitry coupled to the protection-circuit input node, the sense node, and the switch, and configured to deactivate the switch in response to at least two of
• a magnitude of the input voltage exceeding an input-voltage threshold,
• a magnitude of the battery voltage exceeding a battery-voltage threshold, and
• a magnitude of the switch current exceeding a switch-current threshold.