LMP8603MA/NOPB Texas Instruments, Current Sense Amplifier Single Bidirectional, Differential, Rail to Rail,

Current and power measurement for real-time system protection, feedback control and high-accuracy system monitoring.

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Current Sensing Amplifiers have a voltage output that is proportional to the volt drop across a very low value resistor, usually in a high-current power rail. Hence they measure the current flowing in that power rail.