Semiconductor integrated circuit for generating constant interna

Details Semiconductor integrated circuit for generating constant interna Semiconductor integrated circuit for generating constant interna

1993-07-21

1996-06-18

Nguyen, Mattew V.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

G05F 316

Patent

active

055281290

ABSTRACT:
A semiconductor integrated circuit has a function of providing an internal voltage having little dependency on a variation of external power supply voltage comprises a reference voltage generating circuit which outputs a first output corresponding to a reference voltage, a voltage converting circuit which outputs a second output, a level of which is in accordance with an outer power source voltage, a voltage-decrease/boosting selecting circuit which receives first and second outputs and outputs a third output resulting from comparing a level of the first output with a level of the second output, a level of the third output being changed when a level of the outer power source voltage exceeds a prescribed value. Also included are a voltage-decrease circuit which decreases the outer power source voltage upon receiving the third output and outputs an internal voltage when the third output has a first level, a boosting circuit which constantly boosts the outer power source voltage upon receiving the third output and outputs the internal voltage when the third output has a second level, an internal voltage limiting circuit which outputs a fourth output upon receiving the first output and the internal voltage to control a decreasing amount of the voltage-decrease circuit and a boosting amount of the boosting circuit, and an internal circuit for receiving the internal voltage.

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