INA190A2QDDFRQ1

Overview

The INA190A2QDDFRQ1 is an automotive-grade, bidirectional current-sense amplifier with a fixed gain of 50 V/V. It operates on a single supply voltage ranging from 1.7 V to 5.5 V and supports common-mode input voltages from -0.2 V to +40 V. The device features ultra-low input bias current (typical 3 nA) and low offset voltage (maximum ±15 µV). It achieves a minimum common-mode rejection ratio of 132 dB and includes an enable pin for power management. The component is housed in an 8-pin SOT-23-THIN package and is qualified to AEC-Q100 standards for operation between -40°C and +125°C.

Feature Summary

• Ultra-low input bias current enables accurate microamp-level measurements and allows the use of larger sense resistors or input filters without accuracy loss.
• Bidirectional sensing capability achieved through an external reference voltage applied to the REF pin, allowing detection of positive and negative differential input signals.
• Integrated enable pin provides high-impedance output state and reduces quiescent current to less than 0.1 µA when disabled.
• High common-mode rejection ratio blocks DC common-mode voltages, ensuring stable performance across wide input voltage ranges.

Applications

• Body control module (BCM)
• Telematics control unit
• Emergency call (eCall) systems
• Battery management system (BMS)
• Automotive head unit

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the 'A2' designation corresponds to the necessary 50 V/V gain for the design. Ensure the component meets AEC-Q100 Grade 1 requirements for the target automotive environment. Check for functional safety documentation availability if the application involves safety-critical systems.

Selection Notes

Select this part when a fixed gain of 50 V/V is required for bidirectional current monitoring. The DDF package is necessary if the system design requires an external enable pin for power management. Consider the 132 dB CMRR for applications with high common-mode noise. Verify that the 40 V common-mode range aligns with the maximum bus voltage present in the circuit.

Part Context

This component belongs to the INA190-Q1 family of automotive current-sense amplifiers. It shares the same core architecture and specifications as other variants in the series, differing primarily in gain options and package configurations. The family is designed for low-power, high-precision monitoring in 12-V automotive battery systems.

Replacement Considerations

Other members of the INA190-Q1 family, such as INA190A1QDDFRQ1 or INA190A3QDDFRQ1, offer different gain values but share identical packages and electrical characteristics. Substitution requires verifying that the alternative gain factor meets the system's signal conditioning requirements.

FAQ

How does the INA190A2QDDFRQ1 achieve bidirectional current sensing?

It uses an external reference voltage applied to the REF pin to offset the output. Positive differential inputs result in an output voltage greater than the reference, while negative inputs result in a lower output voltage.

What is the purpose of the ENABLE pin on the DDF package?

The ENABLE pin allows the device to be turned off, placing the output in a high-impedance state and reducing the supply current to less than 0.1 µA, which aids in power conservation.

Can this amplifier operate with a common-mode voltage higher than its supply voltage?

Yes, the device supports common-mode input voltages up to +40 V regardless of the supply voltage, which typically ranges from 1.7 V to 5.5 V.