Abstract: A power semiconductor device includes a semiconductor die with a power transistor on a semiconductor substrate, a plurality of wiring layers vertically spaced apart from one another and the transistor, and a plurality of conductive bumps on each wire of the wiring layer spaced farthest from the substrate. Each wire of the layer closest to the substrate is electrically connected to a terminal of the transistor. The wires of the layer spaced farthest from the substrate extend in generally parallel lines and are electrically connected to a terminal of the transistor through each underlying layer. An additional metal layer having a thickness of at least 50 ?m is connected to the die so that contact regions of the additional metal layer are electrically connected to the bumps of the die.

Abstract: A step-down switched-mode power supply circuit includes a transformer having at least one primary winding and at least one secondary winding, a current sensing device for sensing a current through a primary winding of the transformer, a first switch and a second switch, a first comparator for determining if the current through the current sensing device exceeds a threshold, a voltage regulator coupled to the secondary winding to produce a regulated voltage, a second comparator for determining if the regulated voltage has drooped below an acceptable level, a counter coupled to the second comparator for generating a signal having a fixed number of switch cycles, and control circuitry for generating signals controlling the first switch and the second switch and responsive to the first comparator to enter a power saving mode disabling the signals, and to the second comparator to temporarily exit the power saving mode for a fixed number of cycles when the regulated voltage has drooped below an acceptable level.

Abstract: A step-down switched-mode power supply circuit includes a transformer having at least one primary winding and at least one secondary winding, a current sensing device for sensing a current through a primary winding of the transformer, a first switch and a second switch, a first comparator for determining if the current through the current sensing device exceeds a threshold, a voltage regulator coupled to the secondary winding to produce a regulated voltage, a second comparator for determining if the regulated voltage has drooped below an acceptable level, a counter coupled to the second comparator for generating a signal having a fixed number of switch cycles, and control circuitry for generating signals controlling the first switch and the second switch and responsive to the first comparator to enter a power saving mode disabling the signals, and to the second comparator to temporarily exit the power saving mode for a fixed number of cycles when the regulated voltage has drooped below an acceptable level.