The MAX471 GY-471 3A Current Sensor Module is a complete, bidirectional, high side current-sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical.
The MAX471 GY-471 3A Current Sensor Module has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. The module has a built-in 2K Ohm sense resistor giving the module a full sensor range of +/- 3A.
An open-collector SIGN output indicates a current-flow direction, allowing the user to monitor whether a battery is being charged or discharged. Operation is from 3V to 36V, and draws less than 100µA over temperature.