Overview
The INA186-Q1, specifically the INA186A1QDBVRQ1, is an automotive-grade, low-power, voltage-output current-sense amplifier produced by Texas Instruments. This device is designed for precise current measurement in automotive and other high-reliability applications. It operates from a single 1.7-V to 5.5-V power supply and is capable of sensing drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage. The INA186-Q1 is AEC-Q100 qualified and functional safety-capable, making it suitable for critical automotive systems.
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 |
| Quiescent Current | 48 µA (typ), 90 µA (max) | µA |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Options | SC70, SOT-23 (5), SOT-23 (8) | |
| Output Leakage Current (Disabled) | 1 µA (max) | µA |
| Settling Time | 30 µs | µs |
| Voltage Noise Density | 75 nV/√Hz | nV/√Hz |
Key Features
- Precision Current Measurement: The INA186-Q1 offers high accuracy with low gain error and offset specifications, allowing for precise current measurements over a wide dynamic range.
- Low Input Bias Current: The device features very low input bias current, enabling the use of larger current-sense resistors and reducing the current consumed by the device.
- Low Quiescent Current with Output Enable: The device has a low quiescent current and an enable pin that reduces the supply current to less than 0.1 µA when disabled.
- Bidirectional Current Monitoring: The INA186-Q1 can sense current flow in both directions, achieved by applying a voltage at the REF pin to offset the output voltage.
- High Common-Mode Rejection: The device uses a capacitively coupled amplifier, resulting in very high common-mode rejection, typically around 150 dB.
- Rail-to-Rail Output Swing: The INA186-Q1 allows linear current-sensing operation with the output close to the supply rail and ground, maximizing the usable output range.
Applications
- Body Control Module (BCM): Used for monitoring and controlling various automotive body functions.
- Telematics Control Unit: For monitoring and managing telematics systems in vehicles.
- Emergency Call (eCall): Integrated into eCall systems to ensure reliable current monitoring.
- 12-V Battery Management System (BMS): For precise monitoring of battery currents in automotive systems.
- Automotive Head Unit: Used in the head units of vehicles for various monitoring and control functions.
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 INA186-Q1 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 current?
- What is the common-mode voltage range of the INA186-Q1?
The common-mode voltage range is from –0.2 V to +40 V.
- What are the package options available for the INA186-Q1?
The device is available in SC70, SOT-23 (5), and SOT-23 (8) packages.
- How does the enable pin function in the INA186-Q1?
The enable pin reduces the supply current to less than 0.1 µA when the device is disabled.
- What is the typical settling time of the INA186-Q1?
The typical settling time is 30 µs.
- What is the voltage noise density of the INA186-Q1?
The voltage noise density is 75 nV/√Hz.
- Is the INA186-Q1 AEC-Q100 qualified?
