NCS199A2SQT2G onsemi, Current Sense Amplifier Single Rail to Rail 6-Pin SC-70 [NCS199A2SQT2G]; 920-9837
Current Sensing Amplifiers, ON Semiconductor
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.