Current monitor IC integrates sense resistor

The INA250 is the industry’s first device to integrate the shunt resistor with a bi-directional, zero-drift current-sense amplifier. It supports both low-side and high-side implementations with a maximum error of 0.75% total over the temperature range of -40° to 125°C. The IC uses a 2 mΩ shunt resistor with 0.1% tolerance and low 15 ppm/°C drift from -40°C to 125°C.

The chip can monitor 15 A continuous at up to 85°C and its power consumption is less than 300 µA from a 2.7 to 36 V supply. The device comes in four output voltage scales: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A. It uses a 5 x 4.4 mm TSSOP16 package and costs only $1.40 ea/1,000.