Overview
The INA168NA/3KG4, produced by Texas Instruments, is a high-side, unipolar current shunt monitor. This device is part of the INA1x8 family, which includes the INA138 and INA168 models. The INA168 is designed for measuring small differential voltages in the presence of large common-mode voltages, making it ideal for current shunt measurement applications. It features a wide input common-mode voltage range, low quiescent current, and a compact SOT-23 package, enabling its use in a variety of applications where precise current measurement is required.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| Supply Voltage (V+) | V | 2.7 | - | 60 |
| Input Common-Mode Voltage | V | -0.3 | - | 75 |
| Differential Input Voltage (VIN+ - VIN-) | V | -0.4 | - | 2 |
| Operating Temperature | °C | -40 | - | 125 |
| Junction Temperature | °C | - | - | 150 |
| Storage Temperature | °C | -65 | - | 150 |
| Quiescent Current | µA | 25 | 45 | 60 |
| Transconductance | µA/V | 196 | 200 | 204 |
| Output Impedance | GΩ||pF | 1||5 | - | - |
| Bandwidth (ROUT = 5 kΩ) | kHz | - | - | 800 |
Key Features
- Complete Unipolar High-Side Current Measurement Circuit: Designed for precise current measurement in high-side configurations.
- Wide Supply and Common-Mode Range: Input common-mode and power-supply voltages can range from 2.7 V to 60 V, making it versatile for various applications.
- Independent Supply and Input Common-Mode Voltages: Allows the power supply to be connected to either side of the current measurement shunt with minimal error.
- Single Resistor Gain Set: The gain can be set using an external load resistor, allowing for gains from 1 to over 100.
- Low Quiescent Current (25 µA Typical): Minimizes power consumption and allows for efficient operation.
- Wide Temperature Range: –40°C to +125°C: Ensures reliable operation across a broad temperature spectrum.
- 5-Pin SOT-23 Package: Compact packaging suitable for space-constrained applications.
Applications
- Current Shunt Measurement: Ideal for measuring small differential voltages across a shunt resistor in the presence of large common-mode voltages.
- Measurement and Level Shifting: Can be used in various measurement and level-shifting applications due to its flexibility and precision.
- Industrial Automation: Suitable for use in industrial automation systems where accurate current measurement is critical.
- Power Management Systems: Useful in power management systems for monitoring current flow and ensuring system efficiency.
- Automotive Systems: Can be applied in automotive systems for battery management, motor control, and other current measurement needs.
Q & A
- What is the primary function of the INA168NA/3KG4?
The primary function of the INA168NA/3KG4 is to measure small differential voltages in the presence of large common-mode voltages, typically used in high-side current shunt measurement applications.
- What is the operating voltage range for the INA168NA/3KG4?
The operating voltage range for the INA168NA/3KG4 is from 2.7 V to 60 V.
- What is the typical quiescent current of the INA168NA/3KG4?
The typical quiescent current of the INA168NA/3KG4 is 25 µA.
- What is the temperature range for the INA168NA/3KG4?
The operating temperature range for the INA168NA/3KG4 is from –40°C to +125°C.
- How is the gain set for the INA168NA/3KG4?
The gain for the INA168NA/3KG4 is set using an external load resistor, allowing for gains from 1 to over 100.
- What is the package type for the INA168NA/3KG4?
The INA168NA/3KG4 is packaged in a 5-pin SOT-23 package.
- What are some common applications for the INA168NA/3KG4?
Common applications include current shunt measurement, measurement and level shifting, industrial automation, power management systems, and automotive systems.
- How does the INA168NA/3KG4 handle common-mode voltages?
The INA168NA/3KG4 can handle input common-mode voltages independently of the power supply voltage, ranging from 2.7 V to 75 V.
- What is the bandwidth of the INA168NA/3KG4 when using a 5 kΩ load resistor?
The bandwidth of the INA168NA/3KG4 when using a 5 kΩ load resistor is up to 800 kHz.
- Is the INA168NA/3KG4 suitable for use in high-temperature environments?
Yes, the INA168NA/3KG4 is specified for operation over a temperature range of –40°C to +125°C.
