Title:
電圧発生回路
Document Type and Number:
Japanese Patent JP5829072
Kind Code:
B2
Abstract:
A voltage generation circuit supplies an internal power supply voltage to an internal circuit via an output terminal and includes a regulator, a second drive element, and a control circuit The regulator includes a first drive element disposed between an external power supply VDD (first power supply) and an output terminal, and supplies a voltage based on a reference voltage to the output voltage by controlling the first drive element. The second drive element is disposed between the external power supply VDD and the output terminal, and supplies a voltage of the external power supply VDD to the output terminal when activated. When a voltage of the external power supply is a previously set detection voltage value or less, the control circuit activates the first and the second drive element, and when the voltage of the external power supply exceeds the detection voltage value, deactivates the second drive element.
Inventors:
Shingo Nakajima
Application Number:
JP2011175775A
Publication Date:
December 09, 2015
Filing Date:
August 11, 2011
Export Citation:
Assignee:
Renesas Electronics Corporation
International Classes:
G05F1/56
Domestic Patent References:
| JP2005236535A | ||||
| JP2004180472A | ||||
| JP2008009683A |
Attorney, Agent or Firm:
Ken Ieiri