Overview
The INA186A2QDCKRQ1, part of the INA186-Q1 series, is an automotive-grade, low-power, voltage-output current-sense amplifier designed by Texas Instruments. This device is optimized for high-precision current measurement in automotive and other cost-sensitive applications. It operates over a wide common-mode voltage range from –0.2 V to +40 V, independent of the supply voltage, which can range from 1.7 V to 5.5 V. The INA186-Q1 is AEC-Q100 qualified, ensuring reliability in harsh automotive environments with a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 1.7 to 5.5 | V |
| Common-Mode Voltage Range | –0.2 to +40 | V |
| Input Bias Current | 0.5 nA (typ) | nA |
| Gain Options | 25 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V | V/V |
| Offset Voltage | ±50 µV (max) | µV |
| Quiescent Current | 48 µA (typ), 90 µA (max) | µA |
| Package Options | SC70 (6), SOT-23 (5), SOT-23 (8) | |
| Operating Temperature Range | –40°C to +125°C | °C |
Key Features
- High Precision Current Measurement: The INA186-Q1 offers low gain error and offset specifications, allowing for accurate current measurements over a wide dynamic range.
- Low Input Bias Current: The device features very low input bias current, reducing power consumption and enabling the use of larger current-sense resistors and input filters without compromising accuracy.
- Low Quiescent Current: The device draws a low quiescent current of 48 µA (typical) and can be disabled to reduce supply current to less than 0.1 µA.
- Bidirectional Current Monitoring: Certain packages support bidirectional current measurement by using the REF pin to offset the output voltage.
- High Common-Mode Rejection: The device uses a capacitively coupled amplifier, providing high common-mode rejection of approximately 150 dB.
- Rail-to-Rail Output Swing: The output voltage can swing close to the supply rail and ground, maximizing the usable output range).
Applications
- Body Control Module (BCM): Used in automotive body control modules for precise current monitoring.
- Telematics Control Unit: Applied in telematics systems for accurate current sensing.
- Emergency Call (eCall): Utilized in eCall systems to ensure reliable current monitoring.
- 12-V Battery Management System (BMS): Employed in BMS for monitoring battery currents.
- Automotive Head Unit: Used in automotive head units for various current-sensing tasks.
Q & A
- What is the operating temperature range of the INA186-Q1?
The INA186-Q1 operates over a temperature range of –40°C to +125°C).
- What are the available gain options for the INA186-Q1?
The device is available with gain options of 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V).
- What is the typical quiescent current of the INA186-Q1?
The typical quiescent current is 48 µA, with a maximum of 90 µA).
- Can the INA186-Q1 measure bidirectional currents?
Yes, certain packages of the INA186-Q1 support bidirectional current measurement using the REF pin).
- What is the common-mode voltage range of the INA186-Q1?
The device can handle common-mode voltages from –0.2 V to +40 V).
- What are the package options available for the INA186-Q1?
The device is offered in SC70 (6), SOT-23 (5), and SOT-23 (8) packages).
- How does the INA186-Q1 achieve high common-mode rejection?
The device uses a capacitively coupled amplifier, which blocks dc common-mode voltages, resulting in high common-mode rejection of approximately 150 dB).
- What is the significance of the low input bias current in the INA186-Q1?
The low input bias current reduces power consumption, allows the use of larger current-sense resistors, and enables input filters without compromising accuracy).
- Can the INA186-Q1 be disabled to reduce power consumption?
Yes, the device can be disabled, reducing the supply current to less than 0.1 µA).
- What is the rail-to-rail output swing capability of the INA186-Q1?
The output voltage can swing close to the supply rail and ground, maximizing the usable output range).
