Abstract: A DC/DC converter includes N inductors and N power modules which correspond to N phases. The N inductors each include a plurality of inductor chips that are electrically connected in parallel to each other. The plurality of inductor chips are mounted separately on a main mounting surface and a sub-mounting surface of a printed circuit board. The sub-mounting surface is opposite to the main mounting surface.

Abstract: A printed circuit board has an in-pad via. In a first step, a component is mounted on a first surface of a printed circuit board. A screen to be used in a second step has openings at positions corresponding to those of a plurality of pads on a second surface and has a recess positioned to overlap an in-pad via. Solder cream is applied from above the screen, and the screen is removed. Then, a component is mounted on the second surface.

Abstract: A printed circuit board has an in-pad via. In a first step, a component is mounted on a first surface of a printed circuit board. A screen to be used in a second step has openings at positions corresponding to those of a plurality of pads on a second surface and has a recess positioned to overlap an in-pad via. Solder cream is applied from above the screen, and the screen is removed. Then, a component is mounted on the second surface.

Abstract: A DC/DC converter includes N inductors and N power modules which correspond to N phases. The N inductors each include a plurality of inductor chips that are electrically connected in parallel to each other. The plurality of inductor chips are mounted separately on a main mounting surface and a sub-mounting surface of a printed circuit board. The sub-mounting surface is opposite to the main mounting surface.

Abstract: A DC/DC converter includes N inductors and N power modules which correspond to N phases. At least one of the N power modules is mounted on a sub-mounting surface that is opposite to a main mounting surface of a printed circuit board.

Abstract: There is provided a DC/DC converter that can eliminate the necessity of current sense resistors to thereby reduce the mounting area, improve the efficiency, and realize favorable transient characteristics. A multi-phase DC/DC converter with N phases (N is an integer equal to or greater than 2) is provided. A high-side transistor MH, a low-side transistor ML, and an inductor L are provided for each phase ?. Output power supply wiring connects a load side end of each of N inductors L1 to LN and a load. The output power supply wiring is branched from the load toward the load side ends of the N inductors L1 to LN. A coil current flowing through an inductor Li of an ith phase ?i (i=1, 2, . . . N) is detected based on a voltage drop Vsi of a branch portion bri corresponding to the phase ?i of the output power supply wiring.

Abstract: There is provided a DC/DC converter that can eliminate the necessity of current sense resistors to thereby reduce the mounting area, improve the efficiency, and realize favorable transient characteristics. A multi-phase DC/DC converter with N phases (N is an integer equal to or greater than 2) is provided. A high-side transistor MH, a low-side transistor ML, and an inductor L are provided for each phase ?. Output power supply wiring connects a load side end of each of N inductors L1 to LN and a load. The output power supply wiring is branched from the load toward the load side ends of the N inductors L1 to LN. A coil current flowing through an inductor Li of an ith phase ?i (i=1, 2, . . . N) is detected based on a voltage drop Vsi of a branch portion bri corresponding to the phase ?i of the output power supply wiring.

Abstract: An input smoothing circuit is provided between an input line and a ground line. A high-side transistor and a low-side transistor are provided in series between the two ends of the input smoothing circuit. The high-side transistor and the low-side transistor are arranged side by side in a first direction on a circuit board. Two current loops that run through the smoothing circuit, the high-side transistor, and the low-side transistor are formed to be substantially linearly symmetrical with respect to an axis of symmetry that extends in the first direction.

Abstract: An input smoothing circuit is provided between an input line and a ground line. A high-side transistor and a low-side transistor are provided in series between the two ends of the input smoothing circuit. The high-side transistor and the low-side transistor are arranged side by side in a first direction on a circuit board. Two current loops that run through the smoothing circuit, the high-side transistor, and the low-side transistor are formed to be substantially linearly symmetrical with respect to an axis of symmetry that extends in the first direction.

Abstract: An M-channel (M is an integer of at least two) synchronous rectification type step-down DC/DC converter is provided. A controller in the converter (i) calculates a load current on a basis of currents flowing through M inductors, (ii) dynamically changes the number K of driving phases (K is an integer of up to M) on the basis of the calculated load current, (iii) generates a pulse signal adjusted in duty ratio such that an output voltage of an output line coincides with a predetermined reference voltage, (iv) selects K drivers among M drivers, and distributes the pulse signal with a phase difference of (360/K) degrees to each of the selected K drivers, and (v) monotonically increases an amplitude control signal indicating the amplitude of a gate driving voltage with respect to the calculated load current in a range determined in advance for each number K of driving phases.

Abstract: The present disclosure is to provide a DC/DC converter capable of suppressing increase in the ripple amount of the output voltage in association with switching of the number of drive phases. N (N is an integer equal to or larger than 2) switching circuits each generate a switching voltage at the switching node according to an input pulse signal. A phase controller dynamically switches the number K (K is an integer equal to or smaller than N) of drive phases according to the state of a DC/DC converter at the time. A pulse modulator generates a pulse signal whose frequency changes according to the number K of drive phases. A distributor selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of (360/K) degrees.

Abstract: An M-channel (M is an integer of at least two) synchronous rectification type step-down DC/DC converter is provided. A controller in the converter (i) calculates a load current on a basis of currents flowing through M inductors, (ii) dynamically changes the number K of driving phases (K is an integer of up to M) on the basis of the calculated load current, (iii) generates a pulse signal adjusted in duty ratio such that an output voltage of an output line coincides with a predetermined reference voltage, (iv) selects K drivers among M drivers, and distributes the pulse signal with a phase difference of (360/K) degrees to each of the selected K drivers, and (vi) monotonically increases an amplitude control signal indicating the amplitude of a gate driving voltage with respect to the calculated load current in a range determined in advance for each number K of driving phases.

Abstract: Based upon a detection voltage VL that develops between ISEN+ and ISEN? terminals, a current detection circuit detects a coil current IL that flows through an inductor. A measurement circuit is connected to an inductor, and measures an inductance value L and a DC resistance value RDC of the inductor in a calibration operation before normal operation of a DC/DC converter. Based upon the inductance value L and the DC resistance value RDC thus measured, the current detection circuit detects the coil current IL using the detection voltage VL.

Abstract: The present disclosure is to provide a DC/DC converter capable of suppressing increase in the ripple amount of the output voltage in association with switching of the number of drive phases. N (N is an integer equal to or larger than 2) switching circuits each generate a switching voltage at the switching node according to an input pulse signal. A phase controller dynamically switches the number K (K is an integer equal to or smaller than N) of drive phases according to the state of a DC/DC converter at the time. A pulse modulator generates a pulse signal whose frequency changes according to the number K of drive phases. A distributor selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of (360/K) degrees.