Low-power-consumption load current detection circuit applied to PWM DC-DC converter

The invention discloses a low-power-consumption load current detection circuit applied to a PWM DC-DC converter, which belongs to the technical field of microelectronics. The circuit comprises a peakcurrent sensing module, a sampling hold circuit, an analog-to-digital conversion module and the like. A peak current detection module, a sampling hold circuit and an analog-to-digital conversion module are adopted, the input end of the peak current detection module is connected to a drain electrode of a freewheeling tube needing to be detected through a switch tube, then the output end of the peakcurrent detection module is connected with the input end of the sampling hold circuit, and the output end of the sampling hold circuit is connected with the input end of the analog-to-digital conversion circuit. The sampling hold circuit obtains a stable peak current signal through a switch capacitor, the stable peak current signal is converted into a digital signal VS [0: 3] through an analog-to-digital conversion module