Overview
The INA250A2PW is a precision current sense amplifier manufactured by Texas Instruments. This device integrates a 2-mΩ precision shunt resistor and a high-accuracy, zero-drift current-sensing amplifier into a single package. It is designed for bidirectional current measurements and operates over a wide common-mode voltage range from 0 V to 36 V, independent of the supply voltage. The INA250A2PW is available in various gain versions, including 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A, allowing for optimization based on the target current range. The device is fully specified for continuous currents up to 15 A and operates from a single 2.7-V to 36-V supply, drawing a maximum of 300 µA of supply current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Shunt Resistor | 2 mΩ | mΩ |
| Shunt Resistor Tolerance | 0.1% (Max) | % |
| Continuous Current | ±15 A (–40°C to 85°C) | A |
| Gain Error | 0.3% (Max) | % |
| Offset Current | ±50 mA (Max, INA250A2) | mA |
| Common-Mode Input Range | –0.1 V to 36 V | V |
| Operating Supply Voltage | 2.7 V to 36 V | V |
| Quiescent Current | 200 µA to 300 µA | µA |
| Operating Temperature Range | –40°C to 125°C | °C |
| Package Type | TSSOP-16 | |
| Package Size | 5.00 mm × 6.40 mm | mm |
Key Features
- Precision Integrated Shunt Resistor: 2 mΩ with 0.1% maximum tolerance and a temperature coefficient of 10 ppm/°C.
- High Accuracy: Gain error of 0.3% maximum and offset current of ±50 mA maximum for the INA250A2.
- Multiple Gain Versions: Available in 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A to optimize for different current ranges.
- Wide Common-Mode Range: Operates from –0.1 V to 36 V, independent of the supply voltage.
- Low Power Consumption: Draws a maximum of 300 µA of supply current.
- High Temperature Stability: Specified over an extended operating temperature range of –40°C to 125°C.
- System Calibration: Ensures precise matching of the shunt resistor and current-sensing amplifier for high-accuracy measurements.
Applications
- Test Equipment: For precise current measurements in test and measurement applications.
- Power Supplies: To monitor and control current in power supply systems.
- Servers and Telecom Equipment: For current monitoring in high-reliability server and telecom systems.
- Automotive Systems: For monitoring battery and system currents in automotive applications.
- Solar Inverters: To measure and control current in solar power systems.
- Power Management: In various power management and monitoring applications.
Q & A
- What is the shunt resistor value of the INA250A2PW?
The shunt resistor value is 2 mΩ with a tolerance of 0.1% maximum.
- What are the available gain versions for the INA250?
The INA250 is available in four gain versions: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A.
- What is the common-mode input range of the INA250A2PW?
The common-mode input range is from –0.1 V to 36 V.
- What is the maximum continuous current the INA250A2PW can handle?
The device can handle continuous currents up to ±15 A from –40°C to 85°C.
- What is the operating supply voltage range for the INA250A2PW?
The operating supply voltage range is from 2.7 V to 36 V.
- What is the quiescent current of the INA250A2PW?
The quiescent current is between 200 µA and 300 µA.
- What is the operating temperature range for the INA250A2PW?
The operating temperature range is from –40°C to 125°C.
- In what package is the INA250A2PW available?
The device is available in a TSSOP-16 package.
- What are some typical applications for the INA250A2PW?
Typical applications include test equipment, power supplies, servers, telecom equipment, automotive systems, solar inverters, and power management systems).
- How does the INA250A2PW ensure high-accuracy current measurements?
The device ensures high-accuracy measurements through the integration of a precision shunt resistor and a current-sensing amplifier, which are precisely matched to each other).
