Overview
The INA250A4PW, produced by Texas Instruments, is a 36-V, bidirectional, precision current sense amplifier that integrates an internal precision shunt resistor. This device is designed to enable high-accuracy current measurements at common-mode voltages ranging from 0 V to 36 V, independent of the supply voltage. It features a zero-drift topology and is available in a TSSOP-16 package. The INA250A4PW is part of the INA250 family, which includes multiple gain versions to optimize the desired full-scale output voltage based on the target current range expected in the application.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Shunt Resistor | 2 mΩ | mΩ |
| Shunt Resistor Tolerance | 0.1% (Max) | % |
| Maximum Continuous Current | ±15 A (–40°C to 85°C) | A |
| Gain | 2 V/A | V/A |
| Common-Mode Input Range | –0.1 V to 36 V | V |
| Operating Supply Voltage | 2.7 V to 36 V | V |
| Operating Temperature Range | –40°C to 125°C | °C |
| Quiescent Current | 200 μA to 300 μA | μA |
| Output Impedance | 1.5 Ω | Ω |
| Bandwidth (CL = 10 pF) | 11 kHz | kHz |
Key Features
- Precision integrated shunt resistor with 0.1% maximum tolerance and a temperature coefficient of 10 ppm/°C.
- High accuracy with a gain error of 0.3% (max) and an offset current of 50 mA (max) for INA250A2.
- Four available gain versions: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A.
- Wide common-mode range from –0.1 V to 36 V.
- Bidirectional current sensing capability.
- Low quiescent current of 200 μA to 300 μA.
- High common-mode rejection ratio (CMRR) of up to 118 dB.
- System-calibrated to ensure precise matching between the shunt resistor and the current-sensing amplifier.
Applications
- Test Equipment
- Power Supplies
- Servers
- Telecom Equipment
- Automotive Systems
- Solar Inverters
- Power Management Systems
Q & A
- What is the maximum continuous current the INA250A4PW can handle?
The INA250A4PW can handle a maximum continuous current of ±15 A from –40°C to 85°C and up to 10 A at 125°C.
- What are the available gain versions for the INA250 family?
The INA250 family 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 INA250A4PW?
The common-mode input range is from –0.1 V to 36 V.
- What is the operating supply voltage range for the INA250A4PW?
The operating supply voltage range is from 2.7 V to 36 V.
- What is the quiescent current of the INA250A4PW?
The quiescent current is between 200 μA and 300 μA.
- What is the output impedance of the INA250A4PW?
The output impedance is 1.5 Ω.
- What are some typical applications for the INA250A4PW?
Typical applications include test equipment, power supplies, servers, telecom equipment, automotive systems, solar inverters, and power management systems.
- How does the INA250A4PW handle high temperatures?
The device is specified to operate over a temperature range of –40°C to 125°C, with derated current handling capability at higher temperatures.
- What is the significance of the integrated shunt resistor in the INA250A4PW?
The integrated shunt resistor provides high accuracy and low temperature drift, ensuring precise current measurements.
- Can the INA250A4PW be used for bidirectional current sensing?
