INA290A4IDCKT

Overview

The INA290A4IDCKT is a single-channel, high-side current-sense amplifier from Texas Instruments. It features a wide common-mode voltage range of 2.7 V to 120 V and operates on a supply voltage between 2.7 V and 20 V. The device provides a fixed gain of 200 V/V with a maximum gain error of ±0.15%. Key electrical specifications include an input offset voltage of ±12 µV (maximum), an input bias current of 20 µA (typical), and a quiescent current of 370 µA per channel. It offers a bandwidth of 850 kHz at the specified gain and maintains a DC CMRR of 160 dB.

Feature Summary

• Ultra-precise measurement capability enabled by zero-drift architecture for low offset voltage and drift across extended temperature ranges.
• High common-mode rejection ratio ensuring accurate signal processing in noisy environments with large common-mode voltages.
• Wide operational common-mode voltage range supporting high-side sensing applications up to 120 V.
• High-speed performance suitable for fast overcurrent protection and dynamic load monitoring.

Applications

• Active antenna system mMIMO
• Macro remote radio unit power supplies
• 48-V rack server power distribution
• Test and measurement equipment

Procurement Notes

Verify the specific suffix IDCKT corresponds to the SC-70 package and tape-and-reel shipping configuration. Confirm that the A4 designation matches the required 200 V/V gain for your circuit design. Ensure the operating environment stays within the -40°C to +125°C temperature range to maintain specified accuracy levels.

Selection Notes

Select this component when high-side current sensing is required with a common-mode voltage exceeding standard rail limits. The 200 V/V gain is optimal for detecting small differential signals while maintaining sufficient output swing. Consider the 370 µA quiescent current if power efficiency is a constraint compared to higher-current alternatives.

Part Context

This device belongs to the INAx290 family of ultra-precise current-sense amplifiers. It shares architectural similarities with the dual-channel INA2290 and quad-channel INA4290 but is optimized for single-channel applications in space-constrained designs using the compact SC-70 package.

Replacement Considerations

INA290A3IDCKT: Offers 100 V/V gain instead of 200 V/V.

FAQ

What is the minimum common-mode voltage relative to the supply?

The minimum common-mode voltage is restricted by the supply voltage; it cannot go below VS under normal operation conditions as defined by the internal topology.

Does the INA290 support bidirectional current sensing?

No, the INAx290 is designed specifically for high-side, unidirectional current sensing applications.