INA199B3QDCKRQ1

Current Regulation/Management Overview

The INA199B3QDCKRQ1 is a high-side current sense amplifier from Texas Instruments, designed for automotive applications with AEC-Q100 qualification. It features a bidirectional output and operates within a supply voltage range of up to 26 V. The device offers a fixed gain of 200 V/V and maintains an accuracy of 1.5%. Key electrical parameters include a common-mode voltage range of -300 mV to 26 V, a common-mode rejection ratio (CMRR) of 100 dB, and a gain-bandwidth product of 14 kHz. It consumes 115 uA of operating current and functions across a temperature range of -40°C to +125°C.

Current Regulation/Management Feature Summary

• Automotive-grade reliability certified under AEC-Q100 standards for harsh environment operation.
• Zero-drift architecture ensures precise current measurement by minimizing offset voltage drift over time and temperature.
• Bidirectional sensing capability allows detection of current flow in both directions relative to the shunt resistor.
• High common-mode voltage tolerance supports monitoring in systems with supply voltages up to 26 V.

Current Regulation/Management Applications

• Battery management systems in electric vehicles
• Motor control circuits requiring precise current feedback
• Load switch protection and monitoring
• General-purpose high-side current sensing in automotive electronics

Current Regulation/Management Procurement Notes

Verify that the specific suffix QDCKRQ1 corresponds to the SC-70-6 package and tape-and-reel quantity required for your assembly line. Confirm AEC-Q100 compliance documentation is available if your quality management system mandates it. Ensure the lead time aligns with production schedules, as automotive components may have longer fulfillment periods compared to commercial grade parts.

Current Regulation/Management Selection Notes

Select this component when bidirectional current monitoring is necessary in automotive environments. The 200 V/V gain suits applications where moderate signal amplification is needed without excessive sensitivity to noise. Consider the SC-70-6 package size constraints and the 115 uA quiescent current against power budget requirements. Verify that the -300 mV negative common-mode range meets your low-side shunt grounding configuration needs.

Current Regulation/Management Part Context

This part belongs to the INA199 family of zero-drift current sense amplifiers. The 'B3' designation indicates a 1.5% accuracy class and 200 V/V gain. The 'Q1' suffix denotes automotive qualification. It shares architectural similarities with other INA199 variants but differs in precision grade and packaging options like the RSWR UQFN variant.

Current Regulation/Management Replacement Considerations

INA199B3DCKR is a non-automotive equivalent with identical electrical specifications but lacks AEC-Q100 certification. INA199B1QDCKRQ1 offers lower accuracy (higher error percentage) but retains automotive qualification. Ensure pin compatibility and thermal performance match when substituting.

Current Regulation/Management FAQ

What is the minimum common-mode voltage supported by this amplifier?

The INA199B3QDCKRQ1 supports a common-mode voltage range starting from -300 mV, allowing it to monitor currents even when the shunt resistor is slightly below ground potential.

Does this device provide bidirectional output?

Yes, the INA199B3QDCKRQ1 is a bidirectional current sense amplifier, meaning its output voltage changes polarity based on the direction of current flow through the shunt resistor.

What is the fixed voltage gain of this specific model?

The INA199B3QDCKRQ1 has a fixed internal gain of 200 V/V, which amplifies the differential voltage across the shunt resistor by a factor of 200.