INA293 Unidirectional Current-Sense Amp

Texas Instruments' INA293 high-precision current-sense amp can measure voltage drops across shunt resistors over a wide common-mode range from -4 V to +110 V. The negative common-mode voltage allows the device to operate below ground, accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error, and high DC CMRR enables highly accurate current measurement. The INA293 is designed for DC current measurement and high-speed applications such as fast overcurrent protection with high bandwidth of 1.3 MHz and an 85 dB AC CMRR (at 50 kHz).

The INA293 amp operates from a single 2.7 V to 20 V supply, drawing 1.5 mA of supply current. The device is available with five gain options including 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range current-sensing applications. The INA293 is specified over an operating temperature range of -40°C to +125°C and is offered in a space-saving SOT-23 package with two pin-out variants.