Zero-Drift Current-Shunt Monitor
Description
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Reference Design
INA250A1, INA250A2, INA250A3, INA250A4
SBOS511B – APRIL 2015 – REVISED DECEMBER 2015
INA250 36-V, Low- or High-Side, Bidirectional, Zero-Drift Current-Shunt Monitor with Precision Integrated Shunt Resistor
1 Features
•1 Precision Integrated Shunt Resistor: – Shunt Resistor: 2 mΩ – Shunt Resistor Tolerance: 0.
1% (Max) – 15 A Continuous from –40°C to 85°C – 0°C to 125°C Temperature Coefficient: 10 ppm/°C
• High Accuracy: – Gain Error (Shunt and Amplifier): 0.
3% (Max) – Offset Current: 50 mA (Max, INA250A2)
• Four Available Gains: – INA250A1: 200 mV/A – INA250A2: 500 mV/A – INA250A3: 800 mV/A – INA250A4: 2 V/A
• Wide Common-Mode Range: –0.
1 V to 36 V • Specified Operating Temperature: –40°C to 125°C
2 Applications
• Test Equipment • Power Supplies • Servers • Telecom Equipment • Automotive • Solar Inverters • Power Management
3 Description
The INA250 is a voltage-output, current-sensing amplifier family that integrates an internal shunt resistor to enable high-accuracy current measurements at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage.
The device is a bidirectional, low- or highside current-shunt monitor that allows an external reference to be used to measure current flowing in both directions through the internal current-sensing resistor sensor.
The integration of the precision current-sensing resistor provides calibration equivalent measurement accuracy with ultra-low temperature drift performance and ensures an optimized Kelvin layout for the sensing resistor is always obtained.
The INA250 family is available in four output voltage scales: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A.
This device is fully tested and specified for continuous currents up to 10 amps at the maximum temperature of 125°C.
The INA250 operates from a single 2.
7-V to 36-V supply and draws a maximum of 300 µA of supply current.
All INA250 gain ve...
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