Internal power supply circuit and semiconductor device
AssigneeFuji Electric Co., Ltd.
InventorYanzheng Zhang
Life of this patent
Estimating the term…
Abstract
A control switch is connected to a power supply voltage and turns on based on a control signal to output a current. A clamp circuit is connected to a load and performs clamp control of the output voltage of the control switch. A current control element conducts or shuts off a current based on the output voltage to be clamp-controlled. A selector switch group includes switches, and performs switching based on a voltage varying with the current control by the current control element, thereby switching between paths for generating an internal power supply. The switch circuit connects or disconnects the coupling between the clamp circuit and the selector switch group.
Claims5
An internal power supply circuit which generates an internal power supply from a power supply voltage, the internal power supply circuit comprising:
- a control switch which is connected to the power supply voltage and turns on based on a control signal to output a current;
- a clamp circuit which is connected to a load and carries out clamp control of an output voltage of the control switch;
- a current control element which conducts or shuts off the current in accordance with the output voltage to be clamp-controlled;
- a selector switch group which performs switching between paths for generating the internal power supply, based on an application of a voltage varying with conduction or shut-off of the current;
- and
- a switch circuit which connects or disconnects a coupling between the clamp circuit and the selector switch group.
A semiconductor device comprising:
- a charge pump which uses, as an operating power supply, an internal power supply generated from a power supply voltage and performs a boosting operation for driving a load;
- and
- an internal power supply circuit including:
- a control switch which is connected to the power supply voltage and turns on based on a control signal to output a current;
- a clamp circuit which is connected to the load and carries out clamp control of an output voltage of the control switch;
- a current control element which conducts or shuts off the current in accordance with the output voltage to be clamp-controlled;
- a selector switch group which performs switching between paths for generating the internal power supply, based on an application of a voltage varying with conduction or shut-off of the current;
- and a switch circuit which connects or disconnects a coupling between the clamp circuit and the selector switch group.
Dependencies are inferred from the claim text.