Overview
The INA381A1IDSGR, produced by Texas Instruments, is a high-performance, 26-V common-mode current-sensing amplifier with an integrated high-speed comparator. This device is designed for precise current measurement and overcurrent protection in a variety of applications. It operates from a single 2.7-V to 5.5-V supply and is available in 8-pin WSON and 10-pin VSSOP packages. The INA381A1IDSGR features a zero-drift topology, ensuring high accuracy and low offset voltage, making it suitable for both low-side and high-side current-sensing applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Common-Mode Voltage Range | -0.2 V to 26 V | V |
| Supply Voltage Range | 2.7 V to 5.5 V | V |
| Maximum Supply Current | 350 µA | mA |
| Operating Temperature Range | -40°C to 125°C | °C |
| Offset Voltage at 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 at 25°C | 1% (max) | % |
| Gain Error Drift | 20 ppm/°C (max) | ppm/°C |
| Amplifier Gain (INA381A1) | 20 V/V | V/V |
| Comparator Hysteresis | 50 mV | mV |
| Comparator Propagation Delay | 400 ns (typ) | ns |
| Bandwidth (INA381A1) | 350 kHz | kHz |
| Slew Rate | 2 V/µs | V/µs |
Key Features
- High Accuracy Amplifier: Low offset voltage (150 µV max at VCM = 0 V) and low gain error (1% max at 25°C), with a temperature drift of 1 µV/°C.
- Wide Input Common-Mode Voltage Range: Supports input common-mode voltages from -0.2 V to 26 V, independent of the supply voltage.
- Integrated High-Speed Comparator: With hysteresis of 50 mV and propagation delay of 400 ns (typ), supporting transparent and latching modes.
- Fast Response Time: Total system overcurrent protection response time is less than 10 µs.
- Low Power Consumption: Operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA.
- High Bandwidth and Slew Rate: Supports small-signal bandwidths up to 350 kHz and large-signal slew rates of 2 V/µs.
- Compact Packaging: Available in 8-pin WSON and 10-pin VSSOP packages.
Applications
- Merchant Network and Server PSU: For precise current monitoring and overcurrent protection in power supply units.
- Merchant DC/DC Converters: To ensure reliable and efficient current sensing in DC-DC conversion applications.
- DC-Input BLDC Motor Drive: For accurate current measurement and control in brushless DC motor drives.
- Cordless Power Tools: To monitor and protect against overcurrent conditions in battery-powered tools.
- Headsets, Headphones, and Earbuds: For current sensing and protection in audio devices.
Q & A
- What is the input common-mode voltage range of the INA381A1IDSGR?
The input common-mode voltage range is from -0.2 V to 26 V.
- What are the available amplifier gains for the INA381 series?
The available amplifier gains are 20 V/V (INA381A1), 50 V/V (INA381A2), 100 V/V (INA381A3), and 200 V/V (INA381A4).
- What is the maximum supply current of the INA381A1IDSGR?
The maximum supply current is 350 µA.
- What is the operating temperature range of the INA381A1IDSGR?
The operating temperature range is from -40°C to 125°C.
- How does the integrated comparator work?
The comparator measures the voltage across a current-shunt resistor and compares it to a user-defined threshold, supporting both transparent and latching modes.
- What is the propagation delay of the comparator?
The propagation delay of the comparator is 400 ns (typ).
- What is the bandwidth of the INA381A1?
The bandwidth of the INA381A1 is 350 kHz.
- What are the typical applications of the INA381A1IDSGR?
Typical applications include merchant network and server PSU, DC-DC converters, DC-input BLDC motor drives, cordless power tools, and headsets, headphones, and earbuds.
- What is the slew rate of the INA381A1IDSGR?
The slew rate is 2 V/µs.
- What packages are available for the INA381A1IDSGR?
The device is available in 8-pin WSON and 10-pin VSSOP packages.
