Boosting voltage generating circuit, negative voltage generating circuit, step-down voltage generating circuit, and semiconductor device
First Claim
1. A semiconductor device that generates boosting voltage higher than power supply voltage supplied from outside, the boosting voltage generating circuit comprising:
- a boosting voltage detecting circuit that detects whether the boosting voltage is lower than a predetermined voltage value and outputs a result of the detection;
an oscillator that performs an oscillating operation according to the detection result of the boosting voltage detecting circuit;
a boosting circuit unit that generates the boosting voltage using an oscillation signal from the oscillator;
a control circuit that outputs, when a boosting control signal for notifying that electric current is consumed by a load supplied with the boosting voltage is input, a pulse signal at the timing of the notification; and
a first auxiliary boosting circuit unit that supplies, using the pulse signal output from the control circuit, voltage higher than the boosting voltage corresponding to a current amount consumed by the load, to the load.
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Accused Products
Abstract
In a boosting voltage generating circuit, a boosting circuit unit generates boosting voltage according to a value of boosting voltage output by the boosting voltage generating circuit and an auxiliary boosting circuit unit supplies, immediately before electric current is consumed by a load supplied with the boosting voltage, voltage higher than the boosting voltage corresponding to the amount of current consumed by the load, to the load. The auxiliary boosting circuit unit raises the voltage supplied to the load to an optimum amount before the boosting voltage drops.
4 Citations
14 Claims
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1. A semiconductor device that generates boosting voltage higher than power supply voltage supplied from outside, the boosting voltage generating circuit comprising:
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a boosting voltage detecting circuit that detects whether the boosting voltage is lower than a predetermined voltage value and outputs a result of the detection; an oscillator that performs an oscillating operation according to the detection result of the boosting voltage detecting circuit; a boosting circuit unit that generates the boosting voltage using an oscillation signal from the oscillator; a control circuit that outputs, when a boosting control signal for notifying that electric current is consumed by a load supplied with the boosting voltage is input, a pulse signal at the timing of the notification; and a first auxiliary boosting circuit unit that supplies, using the pulse signal output from the control circuit, voltage higher than the boosting voltage corresponding to a current amount consumed by the load, to the load. - View Dependent Claims (2, 3)
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4. A semiconductor device that generates step-down voltage lower than power supply voltage supplied from outside, the step-down voltage generating circuit comprising:
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a differential amplifier that brings the step-down voltage close to a predetermined voltage value; a control circuit that outputs, when a step-down control signal for notifying that electric current is consumed by a load supplied with the step-down voltage is input, a pulse signal at the timing of the notification; and a first transistor that switches, using the pulse signal output from the control circuit, a supply of voltage corresponding to a current amount consumed by the load, to the load. - View Dependent Claims (5)
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6. A semiconductor device that receives command signals of plural patterns from outside and executes operations corresponding to the respective command signals, the semiconductor device comprising an internal voltage generating circuit that generates internal voltage for executing the operations corresponding to the command signals, wherein
the internal voltage generating circuit generates, on the basis of at least a first command signal among the command signals of the plural patterns, voltage of an amount corresponding to execution of operation that corresponds to the first command signal.
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10. A semiconductor device comprising:
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a line supplied with a boosting voltage; a load circuit connected to the line, the load circuit being activated in response to a control signal and operating on the boosting voltage to perform a circuit function; and an energizing circuit responding to the control signal to enlarge a voltage level on the line. - View Dependent Claims (11, 12, 13, 14)
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Specification