Rohm Co., Ltd.

Kotaro Iwata

Makoto Yasusaka

Hiroki Inoue

Zhencheng Jin

Isamu Iwahashi

Kunimasa Tanaka

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.

Overcurrent protection circuit

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.

Semiconductor device

A linear power sourcecomprises: an output transistorthat is connected between an input end of an input voltage VIN and an output end of an output voltage VOUT; a driverfor driving the output transistorso that a feedback voltage VFB according to the output voltage VOUT matches a reference voltage VREF; a current detection unitfor detecting an output current IOUT flowing to the output transistor; and a voltage adjustment unitfor 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.

Linear power supply

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.

Linear regulator and semiconductor integrated circuit

A linear power supply () includes a P-channel (or PNP) first output transistor () connected between an input terminal of an input voltage (Vin) and an output terminal of an output voltage (Vout), an N-channel (or NPN) second output transistor () connected in parallel to the first output transistor (), and a control circuit () that switches between a first mode and a second mode according to the input voltage (Vin), in which the first mode uses the first output transistor () while the second mode uses the second output transistor () as an output transistor that generates the output voltage (Vout) from the input voltage (Vin).

Linear power supply and electronic apparatus using same

A linear power supply circuit includes a first output transistor of a P-channel type or pnp type which is connected between an input terminal to which an input voltage is input and an output terminal from which an output voltage is output; a first differential amplifier configured to amplify a difference between the output voltage or a feedback voltage according to the output voltage and a predetermined first reference voltage and output a first amplification voltage; a second differential amplifier configured to amplify a difference between the input voltage or a first monitor voltage according to the input voltage and the output voltage or a second monitor voltage according to the output voltage and output a second amplification voltage; and a first driver configured to generate a control voltage of the first output transistor according to the first amplification voltage and the second amplification voltage.

Growing community of inventors

Kyoto, Japan

Kotaro Iwata