Overview
The INA186A2QDBVRQ1, produced by Texas Instruments, is an AEC-Q100 qualified, automotive-grade, low-power, voltage-output current-sense amplifier. This device is designed for monitoring systems directly connected to an automotive 12-V battery and is capable of sensing voltage drops across shunts at common-mode voltages ranging from –0.2 V to +40 V, independent of the supply voltage. The INA186-Q1 series, including the INA186A2QDBVRQ1, features a zero-drift architecture, which ensures high accuracy in current measurements with low offset voltage and low gain error.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23 (DBV), 5 pins |
| Operating Temperature Range | –40°C to +125°C |
| Supply Voltage (VS) | 1.7 V to 5.5 V |
| Common-Mode Voltage Range (VCM) | –0.2 V to +40 V |
| Absolute Maximum Input Voltage | 42 V |
| Input Bias Current (IIB) | 500 pA (typical) |
| Quiescent Current (IQ) | 48 µA (typical) |
| Gain Options | 25 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V (INA186A2QDBVRQ1: 50 V/V) |
| Gain Error (EG) | ±1% (maximum) |
| Offset Voltage (VOS) | ±50 µV (maximum) |
| Common-Mode Rejection Ratio (CMRR) | 120 dB (minimum) |
Key Features
- AEC-Q100 Qualified: Suitable for automotive applications with a temperature grade 1 rating of –40°C to +125°C.
- Functional Safety-Capable: Designed to meet functional safety requirements.
- Wide Common-Mode Voltage Range: Operates from –0.2 V to +40 V, with survivability up to 42 V.
- Low Input Bias Currents: 500 pA (typical), enabling accurate microamp current measurements.
- Low Power Consumption: Low supply voltage (1.7 V to 5.5 V) and quiescent current (48 µA typical).
- High Accuracy: Low offset voltage (±50 µV) and gain error (±1%).
- Bidirectional Current Sensing: Capable of sensing current in both directions.
- Enable Pin: Available in some packages, allowing the device to be turned off to reduce supply current to less than 0.1 µA.
- Rail-to-Rail Output Swing: Output voltage can swing close to the supply rail and ground.
Applications
- Body Control Module (BCM)
- Telematics Control Unit
- Emergency Call (eCall) Systems
- 12-V Battery Management System (BMS)
- Automotive Head Unit
Q & A
- What is the operating temperature range of the INA186A2QDBVRQ1?
The operating temperature range is –40°C to +125°C. - What are the gain options available for the INA186-Q1 series?
The gain options are 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The INA186A2QDBVRQ1 specifically has a gain of 50 V/V. - What is the common-mode voltage range of the INA186A2QDBVRQ1?
The common-mode voltage range is from –0.2 V to +40 V. - How much quiescent current does the INA186A2QDBVRQ1 draw?
The quiescent current is 48 µA (typical). - What is the input bias current of the INA186A2QDBVRQ1?
The input bias current is 500 pA (typical). - Is the INA186A2QDBVRQ1 capable of bidirectional current sensing?
Yes, it is capable of bidirectional current sensing. - What is the supply voltage range for the INA186A2QDBVRQ1?
The supply voltage range is from 1.7 V to 5.5 V. - What is the maximum offset voltage of the INA186A2QDBVRQ1?
The maximum offset voltage is ±50 µV. - What is the common-mode rejection ratio (CMRR) of the INA186A2QDBVRQ1?
The CMRR is 120 dB (minimum). - Can the INA186A2QDBVRQ1 be disabled to reduce power consumption?
Yes, the device can be disabled using the enable pin, reducing the supply current to less than 0.1 µA.
