Overview
The INA139NA/250G4, produced by Texas Instruments, is a high-side, unipolar current shunt monitor. This device is part of the INA139 series and is designed to measure small differential voltages across a shunt resistor in the presence of large, common-mode voltages. The INA139NA/250G4 is ideal for applications requiring precise current measurement, such as in automotive, telephone, computer, and power management systems. It features a high-voltage, precision operational amplifier, precision thin film resistors, and a low-noise output transistor, all packaged in a 5-pin SOT-23 package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Full-scale sense voltage (VSENSE) | 100 | 500 | - | mV |
| Common-mode input range | 2.7 | - | 40 | V |
| Common-mode rejection ratio (CMRR) | 99 | 115 | - | dB |
| Offset voltage (RTI) | ±0.2 | ±1.5 | - | mV |
| Offset voltage vs. temperature | - | 1 | - | µV/°C |
| Input bias current | - | 10 | - | µA |
| Transconductance | 990 | 1000 | 1010 | µA/V |
| Nonlinearity error | ±0.01% | ±0.13% | - | % |
| Total output error | ±0.5% | ±2% | - | % |
| Output impedance | - | - | 1 || 5 GΩ || pF | - |
| Bandwidth (ROUT = 10 kΩ) | - | 440 kHz | - | - |
| Settling time (0.1%, 5-V step, ROUT = 10 kΩ) | - | 2.5 µs | - | - |
| Output-current noise density | - | 20 pA/√Hz | - | - |
| Total output-current noise (BW = 100 kHz) | - | 7 nA RMS | - | - |
| Operating power supply range (V+) | 2.7 | - | 40 | V |
| Quiescent current | 60 | 125 | - | µA |
| Temperature range (specification) | -40 | - | 125 | °C |
| Thermal resistance (θJA) | - | 200 | - | °C/W |
Key Features
- High-Side Measurement: Measures current on the high side of the shunt resistor, allowing for accurate current measurement without disrupting the main current path.
- Wide Input Common-Mode Voltage Range: Supports input common-mode voltages from 2.7 V to 40 V, making it suitable for a variety of applications.
- Low Quiescent Current: Typical quiescent current of 60 µA, which is beneficial for power-sensitive applications.
- High Accuracy and Linearity: Offers high accuracy with a nonlinearity error of ±0.01% to ±0.13% and a total output error of ±0.5% to ±2%.
- High Bandwidth and Fast Settling Time: Bandwidth of up to 440 kHz and a settling time of 2.5 µs for a 5-V step, ensuring rapid and accurate measurements.
- Compact Package: Available in a 5-pin SOT-23 package, making it suitable for space-constrained designs.
- Single Power Supply Operation: Can be powered from a single supply voltage, and input voltages can exceed the power supply voltage.
Applications
- Automotive Systems: Ideal for current measurement in automotive systems where high accuracy and reliability are crucial.
- Telephone and Communication Systems: Used in telephone and communication systems for precise current monitoring.
- Computers and Data Centers: Suitable for current measurement in computer systems and data centers to ensure efficient power management.
- Portable and Battery-Backup Systems: Useful in portable devices and battery-backup systems where low quiescent current is essential.
- Battery Chargers and Power Management: Applied in battery chargers and power management systems to monitor and control current accurately.
- Cell Phones and Mobile Devices: Used in cell phones and other mobile devices for efficient current measurement and power management.
Q & A
- What is the primary function of the INA139NA/250G4?
The primary function of the INA139NA/250G4 is to measure small differential voltages across a shunt resistor in the presence of large, common-mode voltages.
- What is the input common-mode voltage range for the INA139NA/250G4?
The input common-mode voltage range for the INA139NA/250G4 is from 2.7 V to 40 V.
- What is the typical quiescent current of the INA139NA/250G4?
The typical quiescent current of the INA139NA/250G4 is 60 µA.
- What is the bandwidth of the INA139NA/250G4 with a 10 kΩ load resistor?
The bandwidth of the INA139NA/250G4 with a 10 kΩ load resistor is up to 440 kHz.
- What is the settling time for a 5-V step with a 10 kΩ load resistor?
The settling time for a 5-V step with a 10 kΩ load resistor is 2.5 µs.
- Can the INA139NA/250G4 be powered from a single power supply?
Yes, the INA139NA/250G4 can be powered from a single power supply, and input voltages can exceed the power supply voltage.
- What is the temperature range for the INA139NA/250G4?
The temperature range for the INA139NA/250G4 is from –40°C to +125°C.
- What package type is the INA139NA/250G4 available in?
The INA139NA/250G4 is available in a 5-pin SOT-23 package.
- What are some common applications for the INA139NA/250G4?
Common applications include automotive systems, telephone and communication systems, computers, portable and battery-backup systems, battery chargers, and power management systems.
- How does the INA139NA/250G4 convert differential input voltage to output voltage?
The INA139NA/250G4 converts the differential input voltage to a current output, which is then converted to a voltage by an external load resistor.
