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US 8,797,007 B2Granted
Semiconductor integrated circuit and DC-DC converter
AssigneeKabushiki Kaisha Toshiba
InventorYoichi Tokai
Life of this patent
Estimating the term…
Abstract
A DC-DC converter includes a smoothing capacitor connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage. The DC-DC converter includes a choke coil having a first end connected to a first end of a battery. The DC-DC converter includes a semiconductor integrated circuit having a switch terminal connected to a second end of the choke coil, a first potential terminal connected to the first output terminal, and a second potential terminal connected to the second output terminal and a second end of the battery.
Claims19
A DC-DC converter comprising:
- a smoothing capacitor connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage;
- a choke coil having a first end connected to a first end of a battery;
- and
- a semiconductor integrated circuit having a switch terminal connected to a second end of the choke coil, a first potential terminal connected to the first output terminal, and a second potential terminal connected to the second output terminal and a second end of the battery,
- the semiconductor integrated circuit comprising:
- a first MOS transistor of a first conductivity type, the first MOS transistor having a first end connected to the first potential terminal, a second end connected to the switch terminal, and a gate fed with a first control signal;
- a second MOS transistor of a second conductivity type, the second MOS transistor having a first end connected to the switch terminal and a second end connected to the second potential terminal;
- a third MOS transistor of the first conductivity type, the third MOS transistor having a first end connected to the first potential terminal and a second end connected to a gate of the second MOS transistor;
- a fourth MOS transistor of the second conductivity type, the fourth MOS transistor having a first end connected to the second end of the third MOS transistor and a second end connected to the second potential terminal;
- a fifth MOS transistor of the second conductivity type, the fifth MOS transistor having a first end connected to a gate of the fourth MOS transistor and a second end connected to the second potential terminal;
- a first inverter that is fed with a second control signal and has an output connected to the gate of the third MOS transistor;
- a second inverter that is fed with the second control signal and has an output connected to the gate of the fourth MOS transistor;
- a switching control circuit that controls operations of the first MOS transistor and the second MOS transistor by means of the first control signal and the second control signal;
- and
- a gate control circuit that is connected between the switch terminal and the second potential terminal to control an operation of the fifth MOS transistor.
12 more elements
A semiconductor integrated circuit applied to a DC-DC converter, the DC-DC converter comprising:
- a smoothing capacitor that is connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage;
- and a choke coil having a first end connected to a first end of a battery, the semiconductor integrated circuit comprising:
- a switch terminal connected to a second end of the choke coil;
- a first potential terminal connected to the first output terminal;
- a second potential terminal connected to the second output terminal and a second end of the battery;
- a first MOS transistor of a first conductivity type, the first MOS transistor having a first end connected to the first potential terminal, a second end connected to the switch terminal, and a gate fed with a first control signal;
- a second MOS transistor of a second conductivity type, the second MOS transistor having a first end connected to the switch terminal and a second end connected to the second potential terminal;
- a third MOS transistor of the first conductivity type, the third MOS transistor having a first end connected to the first potential terminal and a second end connected to a gate of the second MOS transistor;
- a fourth MOS transistor of the second conductivity type, the fourth MOS transistor having a first end connected to the second end of the third MOS transistor and a second end connected to the second potential terminal;
- a fifth MOS transistor of the second conductivity type, the fifth MOS transistor having a first end connected to a gate of the fourth MOS transistor and a second end connected to the second potential terminal;
- a first inverter that is fed with a second control signal and has an output connected to the gate of the third MOS transistor;
- a second inverter that is fed with the second control signal and has an output connected to the gate of the fourth MOS transistor;
- a switching control circuit that controls operations of the first MOS transistor and the second MOS transistor by means of the first control signal and the second control signal;
- and
- a gate control circuit that is connected between the switch terminal and the second potential terminal to control an operation of the fifth MOS transistor.
12 more elements
Dependencies are inferred from the claim text.