Overview
The INA186A5-Q1, produced by Texas Instruments, is an automotive-grade, low-power, voltage-output current-sense amplifier. This device is designed for precise current measurement in automotive systems, particularly those directly connected to a 12-V battery. 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 INA186A5-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 V to 5.5 V | V |
| Common-Mode Voltage Range | –0.2 V to +40 V | V |
| Gain Options | 25 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V | V/V |
| Quiescent Current (Typical) | 48 µA | µA |
| Quiescent Current (Disabled) | 10 nA | nA |
| Input Bias Current (Typical) | 0.5 nA | nA |
| Offset Voltage (Maximum) | ±50 µV | µV |
| Gain Error (Maximum) | ±1% | % |
| Common-Mode Rejection Ratio | Approximately 150 dB | dB |
| Package Options | SC70, SOT-23 (5), SOT-23 (8) | - |
Key Features
- Precision Current Measurement: The INA186A5-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 power loss in the current-sense circuit.
- Low Quiescent Current: The device draws a low quiescent current of 48 µA (typical) and reduces to 10 nA when disabled, making it suitable for battery-powered applications.
- Bidirectional Current Monitoring: The INA186A5-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 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 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 current-sensing tasks.
Q & A
- What is the operating temperature range of the INA186A5-Q1?
The INA186A5-Q1 operates over a temperature range of –40°C to +125°C.
- What are the available gain options for the INA186A5-Q1?
The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the typical quiescent current of the INA186A5-Q1?
The typical quiescent current is 48 µA.
- Can the INA186A5-Q1 measure current in both directions?
- What is the common-mode rejection ratio of the INA186A5-Q1?
The common-mode rejection ratio is approximately 150 dB.
- What are the package options available for the INA186A5-Q1?
The device is available in SC70, SOT-23 (5), and SOT-23 (8) packages.
- How does the INA186A5-Q1 reduce power loss in current-sense circuits?
The device reduces power loss by allowing the use of larger current-sense resistors due to its low input bias current.
- What is the maximum offset voltage of the INA186A5-Q1?
The maximum offset voltage is ±50 µV.
- Can the INA186A5-Q1 be used in high-side and low-side current-sensing configurations?
- How does the enable pin function in the INA186A5-Q1?
The enable pin, available in the DDF package, allows the device to be turned off, reducing the supply current to less than 0.1 µA.
