SWITCHING REGULATOR, DC/DC CONVERTER, AND LSI SYSTEM WITH SWITCHING REGULATOR

摘要

A switching regulated synchronous rectifier comprises first and second switches (SW1, SW2) connected in series between power supply (Vdd) and ground (Vss), a switch controller (1) for turning on and off the switches (SW1, SW2), and a smoothing circuit (4) for smoothing output node potential (Vnd). When a signal (Sc1) indicates that the output node potential (Vnd) is lower than a first reference potential (Vr1) used as a reference to detect the appearance of inrush current with the first switch (SW1) on, a control circuit (10) turns off the first switch (SW1). In other words, the detection of inrush current is based on the voltage drop across the on-state resistance of the first switch (SW1), and this eliminates the need of an extra resistor dedicated to the detection of inrush current.