Low cost LF driver current sense topology

A switching amplifier circuit (200) connected to drive an impedance-based output load (230) includes high side and low side switches (201-204) configured and connected to connect first and second supply voltage lines to first and second output nodes (ANTP, ANTN) in response to gating control signals, and also includes an output current sensing circuit for measuring a current through the output load with a current sensing resistor (Rs) connected between the second supply voltage line and a source of one or more split gate-source switching transistors (203C) in the low side gate-source switching transistor, where a voltage sense circuit connected across the current sensing resistor is configured to sample a voltage across the current sensing resistor for measuring a sense current at the current sensing resistor.