Patents by Inventor Makoto Yasusaka
Makoto Yasusaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240061457Abstract: A linear power supply includes: a first transistor configured to be connectable between an input terminal configured to input an input voltage thereto and an output terminal configured to output an output voltage therefrom; a reference voltage generator configured to generate a reference voltage; a controller configured to control the first transistor based on the difference between a feedback voltage reflecting the output voltage and the reference voltage; and a second transistor configured to be connectable between the input terminal or the output terminal and the first transistor and configured to clamp the first terminal-to-second terminal voltage of the first transistor.Type: ApplicationFiled: November 3, 2023Publication date: February 22, 2024Inventor: Makoto YASUSAKA
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Patent number: 11881863Abstract: A comparator circuit includes a first comparator configured to compare a voltage based on an input voltage with a first reference voltage, a charge/discharge portion configured to switch between charging and discharging of a capacitor based on an output of the first comparator, a second comparator configured to compare a voltage of the capacitor with a second reference voltage, and a control portion. The control portion is configured to, in a case where the voltage of the capacitor is larger than a predetermined value when the charge/discharge portion performs switching from the charging of the capacitor to the discharging thereof, supply a predetermined voltage instead of the voltage based on the input voltage to the first comparator until the voltage of the capacitor becomes smaller than the predetermined value so that the discharging of the capacitor is maintained by the charge/discharge portion.Type: GrantFiled: March 8, 2021Date of Patent: January 23, 2024Assignee: Rohm Co., Ltd.Inventor: Makoto Yasusaka
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Publication number: 20230393599Abstract: A current detection circuit includes: a first transistor configured to pass a sense current corresponding to a monitoring target current; a second transistor provided on a path through which the sense current flows, and configured such that a voltage across the second transistor is extracted as a current detection signal; and a third transistor having a control terminal connected to a control terminal of the second transistor, having a higher on-threshold voltage than the second transistor, and configured to drive the second transistor in a linear region.Type: ApplicationFiled: June 1, 2023Publication date: December 7, 2023Inventor: Makoto YASUSAKA
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Publication number: 20230353134Abstract: A comparator receives a target voltage and a reference voltage at its inverting and non-inverting input terminals, and outputs a signal corresponding to the level relationship between those voltages. A node provided on the output side of the comparator is fed with a signal equivalent to the output signal of the comparator. Between the node and the non-inverting input terminal of the comparator, a capacitor is inserted.Type: ApplicationFiled: July 10, 2023Publication date: November 2, 2023Inventor: Makoto Yasusaka
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Patent number: 11742844Abstract: A comparator receives a target voltage and a reference voltage at its inverting and non-inverting input terminals, and outputs a signal corresponding to the level relationship between those voltages A node provided on the output side of the comparator is fed with a signal equivalent to the output signal of the comparator. Between the node and the non-inverting input terminal of the comparator, a capacitor is inserted.Type: GrantFiled: August 12, 2020Date of Patent: August 29, 2023Inventor: Makoto Yasusaka
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Publication number: 20230208413Abstract: A comparator circuit includes a first comparator configured to compare a voltage based on an input voltage with a first reference voltage, a charge/discharge portion configured to switch between charging and discharging of a capacitor based on an output of the first comparator, a second comparator configured to compare a voltage of the capacitor with a second reference voltage, and a control portion. The control portion is configured to, in a case where the voltage of the capacitor is larger than a predetermined value when the charge/discharge portion performs switching from the charging of the capacitor to the discharging thereof, supply a predetermined voltage instead of the voltage based on the input voltage to the first comparator until the voltage of the capacitor becomes smaller than the predetermined value so that the discharging of the capacitor is maintained by the charge/discharge portion.Type: ApplicationFiled: March 8, 2021Publication date: June 29, 2023Inventor: Makoto Yasusaka
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Publication number: 20230135542Abstract: A constant voltage generation circuit includes a depression type first transistor and an enhancement type second transistor that constitute an ED type reference voltage source, and a resistor connected between gate and source of the first transistor. For instance, the first transistor and the second transistor are NMOSFETs. In addition, for example, the first transistor has a drain connected to an application terminal of an input voltage, and the second transistor has a source connected to a reference potential terminal. Further, gates of the first transistor and the second transistor and a drain of the second transistor are connected to an output terminal of a constant voltage.Type: ApplicationFiled: February 9, 2021Publication date: May 4, 2023Inventor: Makoto Yasusaka
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Publication number: 20230140757Abstract: A clamp circuit includes a first MOS transistor and a second MOS transistor connected in series with the first MOS transistor. The first MOS transistor has a gate connected to a drain of the first MOS transistor. The second MOS transistor has a gate connected to a drain of the second MOS transistor. The clamp circuit is configured so that at least one of the first MOS transistor and the second MOS transistor causes a body effect.Type: ApplicationFiled: February 5, 2021Publication date: May 4, 2023Inventor: Makoto YASUSAKA
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Patent number: 11495960Abstract: A semiconductor device includes, for example, an external terminal, an output element, a detecting element configured to detect occurrence of a negative voltage at the external terminal, and an off-circuit configured to forcibly turn off the output element when the detecting element detects occurrence of the negative voltage.Type: GrantFiled: February 28, 2020Date of Patent: November 8, 2022Assignee: Rohm Co., Ltd.Inventors: Makoto Yasusaka, Isamu Iwahashi, Kotaro Iwata
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Publication number: 20220337047Abstract: An overcurrent protection circuit limits a monitoring target current to or below a limit current value IOCP. For example, it can operate so as to give the limit current value IOCP, when temperature Tj is lower than a threshold value Tx, a flat temperature response and, when temperature Tj is higher than the threshold value Tx, a negative temperature response. For another example, it can operate so as to set the limit current value IOCP, when temperature Tj is lower than a threshold value Tx, at a first limit current value IOCP having a flat temperature response and, when temperature Tj is higher than the threshold value Tx, at a second limit current value IOCP having a flat temperature response and lower than the first limit current value IOCP.Type: ApplicationFiled: July 1, 2020Publication date: October 20, 2022Inventors: Makoto Yasusaka, Kotaro Iwata
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Patent number: 11449085Abstract: A linear power source 1 comprises: an output transistor 10 that is connected between an input end of an input voltage VIN and an output end of an output voltage VOUT; a driver 30 for driving the output transistor 10 so that a feedback voltage VFB according to the output voltage VOUT matches a reference voltage VREF; a current detection unit 50 for detecting an output current IOUT flowing to the output transistor 10; and a voltage adjustment unit 40 for adjusting the reference voltage VREF or the feedback voltage VFB so that a differential voltage between a first voltage (for example, VIN itself) according to the input voltage VIN and a second voltage (for example, VOUT itself) according to the output voltage VOUT or the reference voltage VREF will not fall below an offset voltage Voffset according to the output current IOUT.Type: GrantFiled: November 22, 2019Date of Patent: September 20, 2022Assignee: Rohm Co., Ltd.Inventors: Makoto Yasusaka, Kotaro Iwata
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Publication number: 20220011796Abstract: A linear power source 1 comprises: an output transistor 10 that is connected between an input end of an input voltage VIN and an output end of an output voltage VOUT; a driver 30 for driving the output transistor 10 so that a feedback voltage VFB according to the output voltage VOUT matches a reference voltage VREF; a current detection unit 50 for detecting an output current IOUT flowing to the output transistor 10; and a voltage adjustment unit 40 for adjusting the reference voltage VREF or the feedback voltage VFB so that a differential voltage between a first voltage (for example, VIN itself) according to the input voltage VIN and a second voltage (for example, VOUT itself) according to the output voltage VOUT or the reference voltage VREF will not fall below an offset voltage Voffset according to the output current IOUT.Type: ApplicationFiled: November 22, 2019Publication date: January 13, 2022Inventors: Makoto Yasusaka, Kotaro Iwata
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Patent number: 11150677Abstract: Disclosed are a series regulator and electronic equipment. The series regulator includes a first amplifier that drives a first transistor connected between a power supply and a load, a second amplifier that drives a second transistor connected in parallel to the first transistor, an amplifier control circuit that controls whether or not operation of the first amplifier is possible according to the load, and a first overcurrent protection circuit that limits a first output current flowing in the first transistor to a first overcurrent set value or smaller. The first overcurrent protection circuit carries out variable control of the first overcurrent set value according to a second output current flowing in the second transistor. The electronic equipment includes the series regulator and a load that receives power supply from the series regulator and operates.Type: GrantFiled: July 23, 2020Date of Patent: October 19, 2021Assignee: ROHM CO., LTD.Inventor: Makoto Yasusaka
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Patent number: 11119519Abstract: For example, a linear power supply includes an output transistor connected between an input terminal of an input voltage and an output terminal of an output voltage, an internal power supply configured to step down the input voltage to generate a predetermined internal power supply voltage, a reference voltage generator configured to generate a predetermined reference voltage from the internal power supply voltage, an amplifier configured to generate a drive signal for the output transistor such that a feedback voltage in accordance with the output voltage is equal to the reference voltage, a drive current generator configured to generate a drive current for the amplifier, and a drive current controller configured to detect a variation of the internal power supply voltage to variably control the drive current.Type: GrantFiled: August 11, 2020Date of Patent: September 14, 2021Assignee: Rohm Co., Ltd.Inventor: Makoto Yasusaka
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Patent number: 11068004Abstract: A regulator includes: a first transistor connected between an input terminal and an output terminal; a feedback circuit configured to control a control voltage of a control electrode of the first transistor such that a voltage of the output terminal approaches a target voltage according to a feedback voltage proportional to the voltage of the output terminal; a second transistor having one end connected to the input terminal and a control electrode to which the control voltage is applied in common with the first transistor; and a clamp circuit configured to set the other end of the second transistor to a voltage determined by the voltage of the output terminal.Type: GrantFiled: July 29, 2020Date of Patent: July 20, 2021Assignee: Rohm Co., Ltd.Inventor: Makoto Yasusaka
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Publication number: 20210141408Abstract: Disclosed are a series regulator and electronic equipment. The series regulator includes a first amplifier that drives a first transistor connected between a power supply and a load, a second amplifier that drives a second transistor connected in parallel to the first transistor, an amplifier control circuit that controls whether or not operation of the first amplifier is possible according to the load, and a first overcurrent protection circuit that limits a first output current flowing in the first transistor to a first overcurrent set value or smaller. The first overcurrent protection circuit carries out variable control of the first overcurrent set value according to a second output current flowing in the second transistor. The electronic equipment includes the series regulator and a load that receives power supply from the series regulator and operates.Type: ApplicationFiled: July 23, 2020Publication date: May 13, 2021Inventor: Makoto YASUSAKA
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Patent number: 10948935Abstract: Disclosed is a linear regulator for generating an output voltage from an input voltage with reference to a ground potential, the linear regulator including a semiconductor integrated circuit, and an external diode that is externally connected to the semiconductor integrated circuit, in which the semiconductor integrated circuit includes an input terminal, an output terminal, an output transistor, a parallel diode, and a control circuit, and an anode of the external diode is connected to a ground, and a cathode of the external diode is connected to the output terminal.Type: GrantFiled: April 24, 2020Date of Patent: March 16, 2021Assignee: ROHM CO., LTD.Inventors: Makoto Yasusaka, Kotaro Iwata
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Publication number: 20210067149Abstract: A comparator receives a target voltage and a reference voltage at its inverting and non-inverting input terminals, and outputs a signal corresponding to the level relationship between those voltages A node provided on the output side of the comparator is fed with a signal equivalent to the output signal of the comparator. Between the node and tine non-inverting input terminal of the comparator, a capacitor is inserted.Type: ApplicationFiled: August 12, 2020Publication date: March 4, 2021Applicant: Rohm Co., Ltd.Inventor: Makoto Yasusaka
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Publication number: 20210055753Abstract: For example, a linear power supply includes an output transistor connected between an input terminal of an input voltage and an output terminal of an output voltage, an internal power supply configured to step down the input voltage to generate a predetermined internal power supply voltage, a reference voltage generator configured to generate a predetermined reference voltage from the internal power supply voltage, an amplifier configured to generate a drive signal for the output transistor such that a feedback voltage in accordance with the output voltage is equal to the reference voltage, a drive current generator configured to generate a drive current for the amplifier, and a drive current controller configured to detect a variation of the internal power supply voltage to variably control the drive current.Type: ApplicationFiled: August 11, 2020Publication date: February 25, 2021Applicant: Rohm Co., Ltd.Inventor: Makoto Yasusaka
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Publication number: 20200356126Abstract: A regulator includes: a first transistor connected between an input terminal and an output terminal; a feedback circuit configured to control a control voltage of a control electrode of the first transistor such that a voltage of the output terminal approaches a target voltage according to a feedback voltage proportional to the voltage of the output terminal; a second transistor having one end connected to the input terminal and a control electrode to which the control voltage is applied in common with the first transistor; and a clamp circuit configured to set the other end of the second transistor to a voltage determined by the voltage of the output terminal.Type: ApplicationFiled: July 29, 2020Publication date: November 12, 2020Applicant: Rohm Co., Ltd.Inventor: Makoto Yasusaka