Internal step-down power supply circuit of semiconductor device

Details Internal step-down power supply circuit of semiconductor device Internal step-down power supply circuit of semiconductor device

1997-09-10

1999-11-30

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

G05F 508

Patent

active

059948868

ABSTRACT:
An internal step-down power supply circuit for lowering an external power supply voltage supplied from outside to an internal power supply voltage in a semiconductor device includes a circuit for generating the internal power supply voltage in response to a control voltage, potential regulation circuits for a normal operation and for a test operation, respectively, having fuse elements for making it possible to regulate the potential of the control circuit, and potential control circuits disposed for the normal operation and for the test operation, respectively, for controlling the potential of the control voltage on the basis of the output of the corresponding potential regulation circuit. The external power supply voltage is used as a power supply of the potential regulation circuit for the normal operation and the internal power supply voltage is used as a power supply of the potential regulation circuit for the test operation. This circuit construction can reduce a DC path current in a fuse circuit for regulating the potential of the internal step-down voltage power supply voltage and can provide low power consumption and stable operations.

REFERENCES:
patent: 5337282 (1994-08-01), Koike
patent: 5428299 (1995-06-01), Koshikawa
patent: 5463585 (1995-10-01), Sanada
patent: 5557232 (1996-09-01), Shimogawa
patent: 5675280 (1997-10-01), Nomura et al.

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