INA310A2QDGKRQ1

Overview

The INA310A2QDGKRQ1 is an automotive-grade, ultra-precise current sense amplifier featuring a fixed gain of 50 V/V. It supports a wide common-mode voltage range from –4 V to +110 V and operates on a single supply between 2.7 V and 20 V. The device offers a signal bandwidth of 1.3 MHz with a slew rate of 2.5 V/µs. Key electrical characteristics include a maximum offset voltage of ±15 µV, a typical CMRR of 160 dB, and a quiescent current of 1.6 mA. It includes an integrated open-drain comparator with a 0.6 V reference threshold.

Feature Summary

• Ultra-precision zero-drift architecture ensures high accuracy with low offset voltage and minimal drift across the operating temperature range.
• Wide common-mode input range allows operation independent of the power-supply voltage for both high-side and low-side sensing.
• Integrated open-drain comparator provides fast overcurrent protection with latching capability and internal reference threshold.
• High signal bandwidth and fast slew rate enable rapid detection and processing of transient current events.

Applications

• Electric power steering (EPS)
• eTurbo and charger systems
• Starter/generator applications
• Regenerative braking systems

Procurement Notes

Verify the specific suffix 'QDGKRQ1' corresponds to the AEC-Q100 qualified Grade 1 version in the VSSOP-8 package. Confirm that the 'A2' designation matches the required 50 V/V gain option. Ensure the ordering part number aligns with the manufacturer's latest orderable addendum to avoid functional discrepancies.

Selection Notes

Select this component when high precision is required alongside fast response times for overcurrent protection. The 50 V/V gain is suitable for moderate shunt voltages where higher gains might saturate the output. Consider the 160 dB CMRR for noisy environments with large common-mode voltage fluctuations.

Part Context

This device belongs to the INA310x-Q1 family of ultra-precise current sense amplifiers designed for automotive applications. It shares the same core topology and features as other gain variants within the series, differing primarily in the fixed internal resistor network that sets the signal amplification factor.

Replacement Considerations

Direct replacements within the same family include INA310A1QDGKRQ1 (20 V/V), INA310A3QDGKRQ1 (100 V/V), INA310A4QDGKRQ1 (200 V/V), and INA310A5QDGKRQ1 (500 V/V). Verify that the system dynamic range accommodates the different gain factors before substituting.

FAQ

How does the RESET pin affect the comparator operation?

When the RESET pin is left open or grounded, the comparator operates in transparent mode. When pulled high, it enters latching mode, holding the output high until the reset condition is cleared.

What is the maximum common-mode voltage the device can survive?

While the operational common-mode range is up to 110 V, the device can survive transient voltages up to +120 V and down to -20 V.