INA254A3IPWAR

The INA254 is a voltage-output, current sense amplifier with a 400-μΩ integrated shunt resistor. The INA254 is designed to monitor bidirectional currents over a wide common-mode range from -4 V to +80 V, independent of the supply voltage. Three fixed gains are available: 20 mV/A, 40 mV/A, and 75 mV/A. The integration of the precision resistor with a zerodrift chopped amplifier provides calibration equivalent measurement accuracy, ultra-low temperature drift performance of ±45 ppm/°C (maximum), and an optimized Kelvin layout for the sensing resistor. The INA254 is designed with enhanced PWM rejection circuitry to suppress large (dv/dt) signals that enable real-time continuous current measurements. The measurements are critical for in-line current measurements in a motor-drive application, and for solenoid valve control applications. This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of 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.

Applications

• 48-V motor controls
• DC/DC converters
• Medical cordless tools
• Solenoid and actuators
• Remote I/O link control

Key features

• Precision integrated 400-μΩ shunt resistor
• Continuous ±75 A at 25°C
• Continuous ±50 A from -40°C to +85°C
• Shunt resistor tolerance: 0.5% (maximum)
• Low drift: 10 ppm/°C (0°C to 125°C)
• Low inductance: 2 nH
• High accuracy
• System gain error: 0.5% (maximum)
• System gain drift: 45 ppm/°C (maximum)
• Input offset current: ±62.5 mA (maximum)
• Input offset drift: 625 μA/°C (maximum)
• DC CMRR > 120-dB
• 90-dB AC CMRR at 50 kHz
• Enhanced PWM rejection
• Wide common-mode range: -4 V to +80 V
• Available gains: 20 mV/A, 40 mV/A, and 75 mV/A