Power supply control apparatus including highly-reliable overcurrent detecting circuit
AssigneeNEC Electronics Corporation
InventorTsuyoshi Mitsuda
Life of this patent
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Abstract
In a power supply control apparatus for controlling supplying of power from a battery to a load including a battery terminal connectable to the battery, an output terminal connectable to the load, and a ground terminal, a transistor is connected between the battery terminal and the output terminal to turn ON and OFF a connection between the battery and the load. An overcurrent detecting circuit is connected between the battery terminal and the output terminal to detect whether or not an overcurrent has flown through the transistor. A control circuit is connected between the battery terminal and the ground terminal to activate the transistor and the overcurrent detecting circuit.
Claims9
A power supply control apparatus comprising:
- a power supply terminal;
- an output terminal;
- a first MOS transistor of a first channel type connected between the power supply terminal and the output terminal and having a gate supplied with a control signal;
- a second MOS transistor of the first channel type connected between the power supply terminal and a first circuit node and having a gate supplied with the control signal;
- a resistor connected between the first circuit node and the output terminal;
- a third MOS transistor of the first channel type connected between the first circuit node and a second circuit node and having a gate connected to the second circuit node, a potential at the second circuit node varying in conjunction with a voltage difference between the first circuit node and the output terminal;
- a first current source connected between the power supply terminal and the second circuit node;
- a fourth MOS transistor of the first channel type connected between the output terminal and a third circuit node and having a gate connected to the second circuit node;
- and
- a second current source connected between the power supply terminal and the third circuit node.
Dependencies are inferred from the claim text.