Overview
The INA381A3QDGSRQ1 from Texas Instruments is a high-speed, current-sensing amplifier with an integrated comparator. This device is designed for both low-side and high-side current-sensing and protection applications. It accurately measures voltages developed across current-shunt resistors on common-mode voltages ranging from –0.2 V to +26 V, independent of the supply voltage. The INA381A3QDGSRQ1 operates from a single 2.7-V to 5.5-V supply and is specified over an operating temperature range of –40°C to +125°C. It is available in a 10-pin VSSOP package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VS) | 2.7 to 5.5 | V |
| Common-Mode Input Range | –0.2 to +26 | V |
| Input Offset Voltage at TA = 25°C | 150 µV (max) at VCM = 0 V, 500 µV (max) at VCM = 12 V | µV |
| Offset Voltage Drift | 1 µV/°C (max) | µV/°C |
| Gain Error | ±1% (max) at 25°C | % |
| Gain Error Drift | 20 ppm/°C (max) | ppm/°C |
| Amplifier Gain (INA381A3) | 100 V/V | V/V |
| Comparator Hysteresis | 50 mV | mV |
| Comparator Propagation Delay | 400 ns (typ) | ns |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Type | 10-pin VSSOP |
Key Features
- High Accuracy Amplifier: Low input offset voltage and drift, ensuring high precision measurements.
- Wide Common-Mode Range: Supports input common-mode voltages from –0.2 V to +26 V, independent of the supply voltage.
- Integrated Comparator: Open-drain comparator with hysteresis and propagation delay, supporting transparent and latched modes.
- Fast Response Time: Total system overcurrent protection response time less than 10 µs.
- Low Power Consumption: Maximum supply current of 350 µA.
- Robust Packaging: Available in 10-pin VSSOP and 8-pin WSON packages.
Applications
- Merchant Network and Server PSU: Used in power supply units for data centers and servers.
- Merchant DC/DC: Employed in DC-DC converters for various applications.
- DC-Input BLDC Motor Drive: Utilized in brushless DC motor drives.
- Cordless Power Tool: Implemented in power tools that require precise current sensing.
- Headsets, Headphones, and Earbuds: Used in audio devices for current monitoring and protection.
Q & A
- What is the operating supply voltage range of the INA381A3QDGSRQ1?
The INA381A3QDGSRQ1 operates from a single 2.7-V to 5.5-V supply.
- What is the common-mode input range of the INA381A3QDGSRQ1?
The common-mode input range is from –0.2 V to +26 V.
- What is the maximum input offset voltage at 25°C for the INA381A3QDGSRQ1?
The maximum input offset voltage at 25°C is 150 µV at VCM = 0 V and 500 µV at VCM = 12 V.
- What are the available gain options for the INA381 series?
The available gains are 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- How does the comparator in the INA381A3QDGSRQ1 operate?
The comparator is an open-drain type with hysteresis and can operate in transparent or latched modes.
- What is the propagation delay of the comparator in the INA381A3QDGSRQ1?
The propagation delay of the comparator is typically 400 ns.
- What is the maximum supply current of the INA381A3QDGSRQ1?
The maximum supply current is 350 µA.
- What are the available package types for the INA381A3QDGSRQ1?
The device is available in 10-pin VSSOP and 8-pin WSON packages.
- What is the operating temperature range of the INA381A3QDGSRQ1?
The operating temperature range is from –40°C to +125°C.
- In what types of applications is the INA381A3QDGSRQ1 commonly used?
It is commonly used in merchant network and server PSU, DC-DC converters, BLDC motor drives, cordless power tools, and audio devices like headsets and headphones.
