Overview
The INA381A1QDGSRQ1, produced by Texas Instruments, is a highly advanced current-sensing amplifier with an integrated high-speed comparator. This device is specifically designed for both low-side and high-side current-sensing and protection applications. It features a zero-drift topology, enabling high-precision measurements across a wide range of common-mode voltages. The INA381A1QDGSRQ1 is qualified for automotive applications and meets the AEC-Q100 standards, ensuring reliability and performance in harsh environments.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VSSOP (DGS) - 10 pins |
| Operating Temperature Range | –40°C to +125°C |
| Supply Voltage | 2.7 V to 5.5 V |
| Maximum Supply Current | 350 µA |
| Common-Mode Input Range | –0.2 V to +26 V |
| Offset Voltage at 25°C | 500 µV (max) at VCM = 12 V, 150 µV (max) at VCM = 0 V |
| Offset Voltage Drift | 1 µV/°C (max) |
| Gain Error at 25°C | 1% (max) |
| Gain Error Drift | 20 ppm/°C (max) |
| Amplifier Gain | 20 V/V (INA381A1), 50 V/V (INA381A2), 100 V/V (INA381A3), 200 V/V (INA381A4) |
| Comparator Hysteresis | 50 mV |
| Comparator Propagation Delay | 400 ns (typ) |
Key Features
- Qualified for automotive applications and AEC-Q100 certified with a device temperature grade 1: –40°C to +125°C.
- Functional safety-capable.
- Zero-drift topology for high-precision measurements with low offset voltage (150 µV max at VCM = 0 V) and low temperature drift (1 µV/°C max).
- Wide input common-mode voltage range: –0.2 V to +26 V, independent of the supply voltage.
- High-speed comparator with 50 mV hysteresis and 400 ns propagation delay.
- Alert threshold set through external reference voltage; supports transparent and latching modes.
- Operates from a single supply voltage of 2.7 V to 5.5 V.
- Available in a 10-pin VSSOP package.
Applications
- Merchant network and server power supplies.
- Merchant DC/DC converters.
- DC-input BLDC motor drives.
- Cordless power tools.
- Headsets, headphones, and earbuds.
Q & A
- What is the operating temperature range of the INA381A1QDGSRQ1?
The operating temperature range is –40°C to +125°C.
- What is the supply voltage range for the INA381A1QDGSRQ1?
The supply voltage range is 2.7 V to 5.5 V.
- What is the maximum supply current of the INA381A1QDGSRQ1?
The maximum supply current is 350 µA.
- What is the common-mode input range of the INA381A1QDGSRQ1?
The common-mode input range is –0.2 V to +26 V.
- What are the available amplifier gains for the INA381-Q1 series?
The available amplifier gains are 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- How does the comparator in the INA381A1QDGSRQ1 operate?
The comparator operates with a hysteresis of 50 mV and a propagation delay of 400 ns. It supports both transparent and latching modes.
- What is the significance of the zero-drift topology in the INA381A1QDGSRQ1?
The zero-drift topology enables high-precision measurements with low offset voltage and low temperature drift, allowing for more accurate current sensing.
- What are some typical applications of the INA381A1QDGSRQ1?
Typical applications include merchant network and server power supplies, DC/DC converters, DC-input BLDC motor drives, cordless power tools, and headsets, headphones, and earbuds.
- Is the INA381A1QDGSRQ1 qualified for automotive use?
Yes, it is qualified for automotive applications and meets the AEC-Q100 standards.
- What package type is the INA381A1QDGSRQ1 available in?
The INA381A1QDGSRQ1 is available in a 10-pin VSSOP package.
