Overview
The INA302A3-Q1 from Texas Instruments is a high-precision, bidirectional current-sensing amplifier designed for automotive and other high-reliability applications. This device is part of the INA30x-Q1 family, which includes the INA302-Q1 and INA303-Q1. It features a zero-drift topology, enabling accurate measurements with minimal offset voltage and drift. The INA302A3-Q1 operates over a wide common-mode input range of –0.1 V to +36 V and is powered from a single 2.7-V to 5.5-V supply. It is AEC-Q100 qualified, ensuring robust performance in automotive environments with a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Differential Input Voltage Range (A3 version) | 0 | - | ±25 | mV |
| Common-Mode Rejection Ratio (A3 version) | 100 | 114 | - | dB |
| Offset Voltage (A3 version) | - | - | 30 | μV |
| Offset Voltage Drift | - | - | 0.5 | μV/°C |
| Gain Error (A3 version) | - | - | 0.15% | - |
| Gain Error Drift | - | - | 10 ppm/°C | - |
| Alert Propagation Delay (Comparator 1) | 0.6 | 1 | - | μs |
| Supply Voltage | 2.7 | - | 5.5 | V |
| Quiescent Current | 850 | 950 | - | μA |
| Operating Temperature Range | -40 | - | +125 | °C |
| Package | - | - | TSSOP (14-pin) | - |
Key Features
- AEC-Q100 Qualified: Suitable for automotive applications with a temperature grade 1: –40°C to +125°C.
- Functional Safety-Capable: Documentation available to aid in functional safety system design.
- Wide Common-Mode Input Range: –0.1 V to +36 V.
- Dual Comparator Outputs: Two independent overlimit alerts for INA302-Q1 and window comparator for INA303-Q1.
- High Accuracy Amplifier: Low offset voltage (30 μV max), low offset voltage drift (0.5 μV/°C max), and low gain error (0.15% max).
- Adjustable Thresholds: Threshold levels set individually using external resistors.
- Fast Alert Response: Comparator 1 alert response time under 1 μs, and adjustable delay for Comparator 2.
- Open-Drain Outputs: With independent latch control modes.
- Bidirectional Current Sensing: Measures current flow in both directions.
Applications
- System Fault Detection: Monitors system health and detects out-of-range conditions.
- Motor Control and Protection: Ensures safe and efficient operation of motors.
- Pump Control and Protection: Monitors and controls pump systems.
- DC/DC Converters: Used in power conversion applications to monitor current.
- Body Control Module: Integrated into body control modules for various automotive functions.
Q & A
- What is the operating temperature range of the INA302A3-Q1?
The INA302A3-Q1 operates over a temperature range of –40°C to +125°C.
- What is the common-mode input voltage range of the INA302A3-Q1?
The common-mode input voltage range is –0.1 V to +36 V.
- What are the available gain options for the INA302A3-Q1?
The available gain options are 20 V/V, 50 V/V, and 100 V/V.
- How is the alert response time set for Comparator 2?
The alert response time for Comparator 2 is set using an external capacitor, allowing a delay range from 2 μs to 10 s.
- What is the quiescent current of the INA302A3-Q1?
The quiescent current is typically 950 μA at 25°C.
- Is the INA302A3-Q1 AEC-Q100 qualified?
Yes, the INA302A3-Q1 is AEC-Q100 qualified for automotive applications.
- What is the package type of the INA302A3-Q1?
The INA302A3-Q1 is available in a 14-pin TSSOP package.
- Can the INA302A3-Q1 detect both overcurrent and undercurrent conditions?
The INA302-Q1 detects overcurrent conditions, while the INA303-Q1 can detect both overcurrent and undercurrent conditions.
- How is the threshold voltage set for the comparators?
The threshold voltage is set using external resistors connected to the LIMIT1 and LIMIT2 pins.
- What is the typical alert propagation delay for Comparator 1?
The typical alert propagation delay for Comparator 1 is under 1 μs.
