Power supply circuit and semiconductor memory device having the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 3, 2000
Grant Date -
N/A
app pub date -
Feb 26, 1998
filing date -
Feb 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A number of booster circuits to be operated out of a plurality of booster circuits are selected in accordance with a level of the boosted voltage to be provided at a common voltage output terminal of the plurality of booster circuits. With such an arrangement, fluctuations in the output voltage that can appear when a light load is applied to the voltage output terminal of the booster circuits can be effectively reduced to make the semiconductor memory device driven by the power supply circuit operate reliably. Further, one of the output terminals of intermediate voltage booster circuits is connected to the output terminal of a high voltage booster circuit. Then, a desired voltage can be obtained from the booster circuits that are implemented without using costly transistors to reduce the chip cost.
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