Rohm Co., Ltd.

Masashi Nagasato

Tetsuo Tateishi

Seiji Takenaka

Kazuhiro Murakami

Isao Takobe

Tadashi Akaho

Takatsugu Wachi

Yujiro Okamoto

Nobukazu Tsukiji

Yuki Iwata

Masafumi Okada

An output feedback control circuit includes, as a means for generating an error signal ERR between a feedback voltage FB commensurate with an output voltage and a reference voltage REF (means for substituting for a single error amplifier), a first signal processor (for example, an amplifier) that forms a first path, and a second signal processor (for example, an amplifier) that forms a second path. The amplifieris more accurate than the amplifier, and the amplifieris faster than the amplifier. To the output terminal of the amplifier, preferably, a capacitor Cc other than a parasitic element is connected. To the output terminal of the amplifier, preferably, no capacitor other than a parasitic element is connected, and a resistor Rc is connected. Preferably, the amplifierhas a transconductance gm1, and the amplifierhas a transconductance gm2 (≠gm1).

Output feedback control circuit and switching power supply including the same

This switching power sourcehas: a switching output circuitwhich drives an inductor current IL by turning on and off an upper switchand a lower switchand generates an output voltage VOUT from an input voltage PVDD; a lower current detection unitwhich detects the inductor current IL flowing through the lower switchduring an ON-period of the lower switchand acquires lower current feedback information Iinfo; an error amplifierwhich outputs voltage feedback information Vinfo including information on an error between the output voltage VOUT (feedback voltage FB) and a reference voltage REF; an information synthesis unitthat generates synthesis feedback information VIinfo by synthesizing Iinfo with Vinfo; and an information holding unitwhich samples Vinfo during the ON-period of the lower switch

Switching power supply, semiconductor integrated circuit device, and differential input circuit

A printed wiring board used to suppress parasitic component is provided. The printed wiring boardincludes a multi-layer substrate, and a power linelaid on the multi-layer substrateand connected with a power terminal row T-Tof a semiconductor device. The power lineincludes a first wiring patternformed on a surface of the multi-layer substrate, a second wiring patternformed within the multi-layer substrate, and interlayer connectionsandelectrically conducting the first wiring patternand the second wiring patternto bypass at least a portion of the power terminal row T-T

Printed wiring board

A switching power supply includes: a switching output circuit configured to generate an output voltage from an input voltage by charging a capacitor by turning on and off an output transistor; a control circuit configured to halt the driving of the switching output circuit when charging electric charge to the capacitor per switching event is limited to a lower limit value and the output voltage, or a feedback voltage commensurate therewith, is raised from a predetermined reference voltage; and a lower limit value setting circuit configured to variably control the lower limit value during the driven period of the switching output circuit. For example, the lower limit value setting circuit can increase the lower limit value with increase in the number of times of switching.

Switching power supply operable in an intermittent driving mode

This semiconductor device has a plurality of external terminals arranged in an array on a bottom surface of a package. The plurality of external terminals include a first external terminal group for receiving an input of a current from outside the device, and a second external terminal group for outputting a current to the outside of the device. The first external terminal group and the second external terminal group are laid out such that respective arrangement patterns thereof are interlocked with each other. The arrangement patterns may be comb-tooth shaped, cross-shaped, S-shaped, T-shaped, L-shaped, or may have a shape comprising a combination thereof. The plurality of external terminals may be pins, solder balls, or electrode pads.

Semiconductor device including external terminal groups

A semiconductor device disclosed in the present specification has a structure that includes: a first terminal that is to be externally connected to a power source line; a second terminal that is to be externally connected to a ground line; a third terminal that is internally connected to the first terminal and to be externally connected to a first terminal of a bypass capacitor; and a fourth terminal that is internally connected to the second terminal and to be externally connected to a second terminal of the bypass capacitor.

Semiconductor device

A high-side variable current source and a high-side transistor are provided in series between a supply power terminal of a control circuit and a gate of a switching transistor. A low-side variable current source and a low-side transistor are provided in series between the gate of the switching transistor and a ground terminal. A slew rate controller controls the current value of at least one of the high-side and low-side variable current sources according to the state of a setting terminal. A switching power supply device has a plurality of output transistors connected in parallel with one another and a controller that generates control signals turning on and off the output transistors at a predetermined frequency so as to generate a desired output voltage from an input voltage and supply the output voltage to a load. The controller determines which output transistor to drive according to the magnitude of the load.

Switching regulator control circuit, switching regulator, electronic appliance, switching power supply device, and television receiver

A multi-output power supply device () comprises a first power supply () for outputting a first output voltage (VDCO); a second power supply () for outputting a second output voltage (VDCO); and a reset circuit () for detecting an abnormality of the first output voltage (VDCO) and for outputting a first reset signal (XRESET) to forcibly stop the output operation of the second power supply ().

Multi-output power supply device and electric apparatus using same

The step-up DC/DC converter () of the present invention has a synchronous rectifier transistor (M); an output transistor (M); a first back-gate control transistor (M) connected between an external terminal (T) and a back gate of the synchronous rectifier transistor (M); a discharge transistor (M) connected between the external terminal (T) and a ground terminal; and a control unit (X) for controlling the on/off state of the components described above. The control unit (X) switches off the first back-gate control transistor (M) and switches on the discharge transistor (M) when stopping the switching operation of the output transistor (M) and the synchronous rectifier transistor (M).

Growing community of inventors

Kyoto, Japan

Masashi Nagasato