Texas Instruments INA254 Zero-Drift Current Sense Amplifier
Texas Instruments INA254 Zero-Drift Current Sense Amplifier is a voltage-output, current sense amplifier with a 400µΩ integrated shunt resistor. The INA254 monitors bidirectional currents over a wide common-mode range from –4V to +80V, independent of the supply voltage. Three fixed gains are available: 20mV/A, 40mV/A, and 75mV/A. Integrating the precision resistor with a zero-drift chopped amplifier provides calibration equivalent measurement accuracy. It also achieves an ultra-low temperature drift performance of ±45ppm/°C (maximum) and an optimized Kelvin layout for the sensing resistor.
The Texas Instruments INA254 is designed to suppress large (dv/dt) signals with enhanced PWM rejection circuitry, enabling real-time continuous current measurements. The measurements are critical for in-line current measurements in motor-drive and control applications. This device operates from a single 2.7V to 5.5V power supply and draws a maximum of 2.4mA supply current. All gain versions are specified over the extended operating temperature range (–40°C to +125°C) and are available in a 24-pin HTSSOP package.
Features
- Precision integrated 400µΩ shunt resistor
- Continuous ±75A at 25°C
- Continuous ±50A from –40°C to +85°C
- 0.5% (maximum) shunt resistor tolerance
- 10ppm/°C (0°C to 125°C) low drift
- 2nH low inductance
- Enhanced PWM rejection
- –4V to +80V wide common-mode range
- Available gains of 20mV/A, 40mV/A, and 75mV/A
- High accuracy
- 0.5% (maximum) system gain error
- 45ppm/°C (maximum) system gain drift
- ±62.5mA (maximum) input offset current
- 625µA/°C (maximum) input offset drift
- DC CMRR > 120dB
- 90dB AC CMRR at 50kHz
Applications
- 48V motor controls
- DC/DC converters
- Medical cordless tools
- Solenoid and actuators
- Remote I/O link control
Functional Block Diagram
Published: 2023-04-27
| Updated: 2023-05-05