INA290 Ultra-Precise Current-Sense Amp

Texas Instruments' INA290 is an ultra-precise current-sense amp that can measure voltage drops across shunt resistors over a wide common-mode range of 2.7 V to 120 V. This amp is available in a highly space-efficient SC-70 package with a PCB footprint of 2.0 mm x 2.1 mm. The ultra-precise current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±12 µV (maximum), a small gain error of ±0.1% (maximum), and a high DC CMRR of 160 dB (typical).

The INA290 is designed for DC measurement and high-speed applications (such as fast overcurrent protection) with high bandwidth of 1 MHz (at a gain of 20 V/V) and an 85 dB AC CMRR (at 50 kHz). The device operates from a single 2.7 V to 20 V supply and draws a 370 µA supply current (typical). The INA290 amp is available with five gain options including 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset of the zero-drift architecture enables current-sensing with low ohmic shunts as specified over the extended operating temperature range of -40°C to +125°C.