Overview
The INA168NA/250, 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. It is designed to measure small differential voltages across a shunt resistor in the presence of large common-mode voltages. The INA168NA/250 features a wide input common-mode voltage range, low quiescent current, and is packaged in a compact 5-pin SOT-23 package. This makes it suitable for a variety of applications requiring precise current measurement and monitoring.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (V+) | 2.7 | 60 | V | ||
| Common-Mode Input Range | 2.7 | 60 | V | ||
| Full-Scale Sense Voltage (VSENSE) | VIN+ - VIN- | -40 | 2 | V | |
| Common-Mode Rejection | VSENSE = 50 mV, VIN+ = 2.7 V to 60 V | 100 | 120 | dB | |
| Offset Voltage | TA = 25°C | ±0.2 | ±1 | mV | |
| Offset Voltage Drift | TA = -40°C to +125°C | 1 | µV/°C | ||
| Quiescent Current | TA = 25°C, VSENSE = 0, IO = 0 | 25 | 45 | µA | |
| Operating Temperature Range | -40 | 125 | °C | ||
| Bandwidth | ROUT = 5 kΩ | 800 | kHz | ||
| Settling Time (0.1%) | 5-V step, ROUT = 5 kΩ | 1.8 | µs |
Key Features
- Complete Unipolar High-Side Current Measurement Circuit: The INA168NA/250 provides a complete solution for high-side current measurement.
- Wide Supply and Common-Mode Range: The device can operate with supply voltages from 2.7 V to 60 V and common-mode voltages up to 60 V.
- Independent Supply and Input Common-Mode Voltages: Allows the power supply and input common-mode voltages to be independent, enhancing flexibility in application design.
- Single Resistor Gain Set: The gain can be set using a single external resistor, allowing for a wide range of gain settings from 1 to over 100.
- Low Quiescent Current: Typical quiescent current of 25 µA, which is beneficial for power-sensitive applications.
- Wide Temperature Range: Operates over a temperature range of -40°C to +125°C.
- Compact SOT-23 Package: The 5-pin SOT-23 package makes it suitable for space-constrained applications.
Applications
- Current Sensing and Monitoring: Ideal for measuring current in high-side configurations, such as in power supplies, motor control systems, and battery management systems.
- Automotive Systems: Suitable for use in automotive applications due to its wide operating temperature range and robust design.
- Industrial Automation: Can be used in various industrial automation applications requiring precise current measurement and monitoring.
- Power Management Systems: Useful in power management systems where accurate current sensing is crucial for efficient operation.
Q & A
- What is the primary function of the INA168NA/250?
The primary function of the INA168NA/250 is to measure small differential voltages across a shunt resistor in high-side current measurement applications.
- What is the supply voltage range for the INA168NA/250?
The supply voltage range for the INA168NA/250 is from 2.7 V to 60 V.
- What is the common-mode input voltage range for the INA168NA/250?
The common-mode input voltage range for the INA168NA/250 is from 2.7 V to 60 V.
- How is the gain set for the INA168NA/250?
The gain for the INA168NA/250 can be set using a single external resistor.
- What is the typical quiescent current of the INA168NA/250?
The typical quiescent current of the INA168NA/250 is 25 µA.
- What is the operating temperature range for the INA168NA/250?
The operating temperature range for the INA168NA/250 is from -40°C to +125°C.
- In what package is the INA168NA/250 available?
The INA168NA/250 is available in a 5-pin SOT-23 package.
- What are some common applications for the INA168NA/250?
Common applications include current sensing and monitoring in power supplies, automotive systems, industrial automation, and power management systems.
- How does the INA168NA/250 handle noise and settling time?
The device has an output-current noise density of 9 pA/√Hz and a settling time to 0.1% of 1.8 µs for a 5-V step with a 5 kΩ load resistor.
- What is the bandwidth of the INA168NA/250?
The bandwidth of the INA168NA/250 is up to 800 kHz with a 5 kΩ load resistor.
