Abstract: A semiconductor device includes: an operational amplifier; an external terminal configured to be attached to an external capacitor; and a resistor configured to be connected between a node, to which an output terminal and an inverting input terminal of the operational amplifier are connected in common, and the external terminal.

Abstract: A bridge output circuit of the present invention reduces the dead time. Upon receiving an input signal (SIN) for indicating on state of a high-side transistor (1H), a gate control signal generation circuit (4) outputs a low-side gate control signal (LGCTL) for turning off a low-side transistor (1L) to a low-side driver circuit (2L). On the other hand, a high-side gate control signal (HGCTL) for turning on the high-side transistor is generated from a signal delayed the low-side gate control signal and outputted to a high-side driver circuit (2H). The time of delay is controlled by the input signal (SIN), a signal (LGFB) indicating on/off state of the low-side transistor, and a signal (SOUT_L) indicating a level of an output signal.

Abstract: A bridge output circuit of the present invention reduces the dead time. Upon receiving an input signal (SIN) for indicating on state of a high-side transistor (1H), a gate control signal generation circuit (4) outputs a low-side gate control signal (LGCTL) for turning off a low-side transistor (1L) to a low-side driver circuit (2L). On the other hand, a high-side gate control signal (HGCTL) for turning on the high-side transistor is generated from a signal delayed the low-side gate control signal and outputted to a high-side driver circuit (2H). The time of delay is controlled by the input signal (SIN), a signal (LGFB) indicating on/off state of the low-side transistor, and a signal (SOUT_L) indicating a level of an output signal.

Abstract: A current mode synchronous rectification direct current (DC)/DC converter according to the present invention includes: a soft start function unit (in FIG. 1, a reference voltage generation unit (104) enabling a reference voltage REF to slowly increase while starting), for inhibiting a target value of an output voltage VO to be lower than that at a normal action while starting; and an output stabilization function unit (in FIG. 1, a frequency variable type oscillator (110A) generating a clock signal CLK and a slope voltage SLOPE through an oscillation frequency corresponding to a reference voltage REF), for performing at least one of waiting for start of a switching action and reduction of a drive frequency while starting.

Abstract: A current mode synchronous rectification direct current (DC)/DC converter according to the present invention includes: a soft start function unit (in FIG. 1, a reference voltage generation unit (104) enabling a reference voltage REF to slowly increase while starting), for inhibiting a target value of an output voltage VO to be lower than that at a normal action while starting; and an output stabilization function unit (in FIG. 1, a frequency variable type oscillator (110A) generating a clock signal CLK and a slope voltage SLOPE through an oscillation frequency corresponding to a reference voltage REF), for performing at least one of waiting for start of a switching action and reduction of a drive frequency while starting.