JPS62109114A - Voltage regulator - Google Patents

Voltage regulator

Info

Publication number
JPS62109114A
JPS62109114A JP25012985A JP25012985A JPS62109114A JP S62109114 A JPS62109114 A JP S62109114A JP 25012985 A JP25012985 A JP 25012985A JP 25012985 A JP25012985 A JP 25012985A JP S62109114 A JPS62109114 A JP S62109114A
Authority
JP
Japan
Prior art keywords
voltage
turned
vout
breakage
junction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP25012985A
Other languages
Japanese (ja)
Inventor
Akira Nakamura
Yasuhei Odajima
Original Assignee
Seiko Instr & Electronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instr & Electronics Ltd filed Critical Seiko Instr & Electronics Ltd
Priority to JP25012985A priority Critical patent/JPS62109114A/en
Publication of JPS62109114A publication Critical patent/JPS62109114A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To protect a control transistor from its breakage due to the discharging current by using a switching circuit that switches the substrate potential of the control transistor so that it is equal to the higher one of both levels of an input voltage source and the output voltage.
CONSTITUTION: When Vin<Vout is satisfied between the input voltage and the output voltage, a transistor TR 53 is turned on and therefore the gate voltage of a TR 54 is approximately equal to the level of the Vout. Then the TR 54 is turned off. While the gate voltage is less than the source voltage with a TR 61 and therefore the TR 61 is turned on. Thus the substrate potential of a control TR 42 is approximately equal to the voltage Vout and therefore the P-N junction consisting of a P+ area 23 and N+ area 25 is adversely biased. Thus no current flows to the P-N junction part even in case a capacitor, etc. are connected between terminals 11 and 9. This prevents the breakage of the TR 42.
COPYRIGHT: (C)1987,JPO&Japio
JP25012985A 1985-11-08 1985-11-08 Voltage regulator Pending JPS62109114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25012985A JPS62109114A (en) 1985-11-08 1985-11-08 Voltage regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25012985A JPS62109114A (en) 1985-11-08 1985-11-08 Voltage regulator

Publications (1)

Publication Number Publication Date
JPS62109114A true JPS62109114A (en) 1987-05-20

Family

ID=17203256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25012985A Pending JPS62109114A (en) 1985-11-08 1985-11-08 Voltage regulator

Country Status (1)

Country Link
JP (1) JPS62109114A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01302409A (en) * 1988-05-30 1989-12-06 Nec Ic Microcomput Syst Ltd Power source circuit
JPH04162111A (en) * 1990-10-25 1992-06-05 Nec Kansai Ltd Dc power circuit
JP2008077683A (en) * 2007-11-27 2008-04-03 Ricoh Co Ltd Reverse overcurrent preventing circuit
US9703307B2 (en) 2015-01-29 2017-07-11 Socionext Inc. Voltage dropping circuit and integrated circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01302409A (en) * 1988-05-30 1989-12-06 Nec Ic Microcomput Syst Ltd Power source circuit
JPH04162111A (en) * 1990-10-25 1992-06-05 Nec Kansai Ltd Dc power circuit
JP2008077683A (en) * 2007-11-27 2008-04-03 Ricoh Co Ltd Reverse overcurrent preventing circuit
JP4671364B2 (en) * 2007-11-27 2011-04-13 株式会社リコー Reverse overcurrent protection circuit
US9703307B2 (en) 2015-01-29 2017-07-11 Socionext Inc. Voltage dropping circuit and integrated circuit

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