CURRENT MODE SWITCHING REGULATOR

PROBLEM TO BE SOLVED: To provide a switching regulator wherein it is possible to prevent degradation in efficiency under light load or no load and exclude ripples in output voltage. SOLUTION: The current mode switching regulator 100 includes a higher-order transistor QH and a lower-order transistor QL, a switching output circuit 180 that generates output voltage Vout1 in proportion to input voltage Vin1, and an output terminal 190 for outputting the output voltage Vout1. The switching regulator further includes a current detection comparator 124 that detects a current passed through the higher-order transistor QH and a switching circuit 122 that controls the operation of the current detection comparator 124. The switching circuit 122 is controlled by a load detection circuit 140 that compares the pulse widths of the respective gate pulses SH, SL of the higher-order transistor QH and the lower-order transistor QL with the pulse width of switching voltage Vsw1. The operating period of the current detection comparator 124 is determined by the load detection circuit 140. COPYRIGHT: (C)2011,JPO&INPIT