APPLICATION NOTE 4507

Load-Power Monitor Improves High-Side Current Measurements

By: Maurizio Gavardoni

Abstract: Combining a high-side current-sense amplifier with an analog voltage multiplier, MAX4211 shown can easily measure the power dissipated in a load. One multiplier input connects to the load voltage, and the other to an internal analog of the load current—that is, a proportional voltage produced by the internal current-sense amplifier. The multiplier output (VLIL) is then a voltage proportional to load power.