INA280 High-Precision Current Sense Amp

Texas Instruments' INA280 is a current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. This device is in a highly space-efficient SC-70 package with a PCB footprint of 2.0 mm × 2.1 mm. The current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±150 µV (maximum), a small gain error of ±0.5% (maximum), and a high DC CMRR of 140 dB (typical). The INA280 is designed for DC current measurement and high-speed applications such as fast overcurrent protection with high bandwidth of 1.1 MHz (at a gain of 20 V/V) and an 85 dB AC CMRR (at 50 kHz). The INA280 operates from a single 2.7 V to 20 V supply and draws a 370 μA supply current (typical). The INA280 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 and drift enable accurate current sensing over the extended operating temperature range of -40°C to +125°C.