International Rectifier IR3720 power monitor ic with digital interface measures the output voltage and inductor current of low-voltage DC-to-DC converters and reports the average power over a user specified time interval as a digital word on the I²C. The output current is measured across a current sensing resistor or indirectly across the inductor’s DCR winding resistance. Additionally, the current measurement method is also applicable to multiphase converters. The real time voltage and current signals are multiplied, digitized, and averaged over a user selectable averaging interval providing Patent Pending TruePower™ measurement of highly dynamic loads.

IR3720 Typical Application Circuit