Overview
The INA169NA/3KG4, produced by Texas Instruments, is a high-side, unipolar current shunt monitor. This device is part of the INA1x9 family and is designed to measure small differential voltages across a shunt resistor in the presence of large common-mode voltages. The INA169 is particularly suited for applications requiring high voltage measurement capabilities, with a common-mode input range of 2.7 V to 60 V. It features a low quiescent current of 60 µA, making it energy-efficient for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.7 to 60 | V |
| Common-Mode Input Range | 2.7 to 60 | V |
| Full-Scale Sense Voltage | 100 to 500 | mV |
| Offset Voltage (RTI) | ±0.2 to ±1.5 | mV |
| Quiescent Current | 60 | µA |
| Temperature Range | –40 to +85 | °C |
| 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 | |
| Package | 5-pin SOT-23 |
Key Features
- Complete Unipolar High-Side Current Measurement Circuit: The INA169 provides a complete solution for measuring current on the high side of a shunt resistor.
- Wide Supply and Common-Mode Range: Operates with supply voltages from 2.7 V to 60 V and common-mode input voltages up to 60 V.
- Independent Supply and Input Common-Mode Voltages: Allows the power supply to be independent of the input common-mode voltage.
- Single Resistor Gain Set: Gain can be set using a single external resistor.
- Low Quiescent Current: Typical quiescent current of 60 µA, making it suitable for power-sensitive applications.
- High Accuracy and Linearity: Offers high accuracy with nonlinearity error as low as ±0.01% to ±0.1% over the full-scale sense voltage range.
Applications
- Current Shunt Measurement: Ideal for measuring current in automotive, telephone, and computer systems.
- Portable and Battery-Backup Systems: Suitable for use in battery-powered devices and backup systems.
- Battery Chargers: Used in battery charging circuits to monitor and control charging currents.
- Power Management: Employed in power management systems to monitor and manage power consumption.
- Cell Phones and Other Portable Electronics: Used in various portable electronic devices for current measurement and monitoring.
Q & A
- What is the common-mode input voltage range of the INA169?
The common-mode input voltage range of the INA169 is from 2.7 V to 60 V.
- What is the typical quiescent current of the INA169?
The typical quiescent current of the INA169 is 60 µA.
- How is the gain set in the INA169?
The gain in the INA169 can be set using a single external resistor.
- What is the temperature range for the INA169?
The INA169 is specified for a temperature range of –40°C to +85°C.
- What is the bandwidth of the INA169 when using a 10 kΩ load resistor?
The bandwidth of the INA169 is 440 kHz when using a 10 kΩ load resistor.
- How does the INA169 handle differential input voltages?
The INA169 can handle differential input voltages up to 2 V without damage, but accurate measurements are limited to a maximum differential input voltage of 0.5 V.
- Can the INA169 be used in safety-critical applications?
No, the INA169 is not recommended for use in safety-critical applications. Refer to the datasheet for detailed information on usage and limitations.
- What package type is the INA169 available in?
The INA169 is available in a 5-pin SOT-23 package.
- How does the output current of the INA169 relate to the input voltage?
The output current of the INA169 is directly proportional to the differential input voltage across the shunt resistor, with a transconductance of 1000 µA/V.
- What are some typical applications of the INA169?
The INA169 is typically used in current shunt measurement, automotive systems, telephone systems, battery chargers, power management systems, and portable electronics.
