Output circuit, temperature switch IC, and battery pack

摘要

An output circuit has a smaller area and restrains outputs from becoming unstable even if a power supply voltage is lower than an operating voltage. A supply terminal of an inverter circuit is provided with switch circuit, and the switch circuit stops the operation of the inverter circuit when the power supply voltage is lower than the operating voltage of the circuit. Further, the output terminal of the inverter circuit is provided with a current source to fix the output to the power supply voltage when the operation of the inverter circuit is stopped.

主权项

1. An output circuit with open-drain output comprising:
an inverter circuit connected to an input terminal of the output circuit; an output MOS transistor having a gate thereof connected to an output terminal of the inverter circuit, a drain thereof directly connected to an output terminal of the output circuit, and a source thereof connected to a first supply terminal; a switch circuit between the inverter circuit and a second supply terminal; and a current source connected to an output of the inverter circuit between the gate of the output MOS transistor and the first supply terminal, wherein the switch circuit turns off when a power supply voltage is lower than a minimum operating voltage of the output circuit.