The MAX4172 is a low-cost, precision, high-side currentsenseamplifier for portable PCs, telephones, and othersystems where battery/DC power-line monitoring is critical.High-side power-line monitoring is especially useful inbattery-powered systems, since it does not interfere withthe battery charger’s ground path. Wide bandwidth andground-sensing capability make the MAX4172 suitablefor closed-loop battery-charger and general-purpose current-source applications. The 0 to 32V input commonmoderange is independent of the supply voltage, whichensures that current-sense feedback remains viable,even when connected to a battery in deep discharge.