Patent ID: 7564231

Claim:
Switching power supply source comprising: an inductor comprising first and second terminals; an output node; an NMos transistor, a source of which is connected to a ground and a drain of which is connected to a first terminal of the inductor; a PMos transistor, a drain of which is connected to the first terminal of the inductor; a switching power supply control device generating switching control signals for the NMos and PMos transistors, the control signals are capable of assuring that the NMos and PMos transistors are not conducting simultaneously; a capacitor with a first terminal connected to the first terminal of the inductor and a second terminal; a resistor with a first terminal of the resistor connected to the second terminal of the capacitor, and a second terminal of the resistor connected to the ground; and a detection NMos transistor, a source of which is connected to the ground, a drain of which is connected to a gate of the PMos transistor, and a gate of which is connected to the second terminal of the capacitor.