INA138QPWRQ1

Product Overview

Category: Integrated Circuit (IC)

Use: The INA138QPWRQ1 is a high-side current shunt monitor IC designed for precise current measurement in automotive and industrial applications. It provides accurate current sensing with low offset voltage and high common-mode rejection.

Characteristics: - High accuracy - Low offset voltage - High common-mode rejection ratio - Wide supply voltage range - Small package size

Package: The INA138QPWRQ1 is available in a small 8-pin TSSOP package, which allows for space-efficient PCB layout designs.

Essence: The essence of the INA138QPWRQ1 lies in its ability to accurately measure current on the high side of a circuit, making it suitable for various applications where precise current monitoring is required.

Packaging/Quantity: The INA138QPWRQ1 is typically sold in reels of 2500 units per reel.

Specifications

• Supply Voltage Range: 2.7V to 36V
• Input Common-Mode Voltage Range: -0.3V to V+ + 0.3V
• Quiescent Current: 60µA (typical)
• Gain Error: ±0.5% (maximum)
• Offset Voltage: ±150µV (maximum)
• Bandwidth: 200kHz (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The INA138QPWRQ1 features an 8-pin TSSOP package with the following pin configuration:

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| | | 1 8 | | | | 2 7 | | | | 3 6 | | | | 4 5 | |___________| ```

1. V+ (Positive Supply Voltage)
2. V- (Negative Supply Voltage)
3. REF (Reference Voltage)
4. IN+ (Positive Current Sense Input)
5. OUT (Output)
6. GND (Ground)
7. NC (No Connection)
8. IN- (Negative Current Sense Input)

Functional Features

The INA138QPWRQ1 offers the following functional features:

1. High Accuracy: The IC provides precise current measurement with a gain error of ±0.5%.
2. Low Offset Voltage: It has a low offset voltage of ±150µV, ensuring accurate current sensing.
3. High Common-Mode Rejection Ratio: The IC exhibits high rejection of common-mode noise, enabling accurate measurements in noisy environments.
4. Wide Supply Voltage Range: With a supply voltage range of 2.7V to 36V, it can be used in various applications.
5. Small Package Size: The compact 8-pin TSSOP package allows for space-efficient PCB layout designs.

Advantages and Disadvantages

Advantages: - High accuracy current sensing - Low offset voltage for precise measurements - Wide supply voltage range for versatility - Compact package size for efficient PCB layout

Disadvantages: - Limited bandwidth compared to some other current shunt monitor ICs - Noisy environments may affect accuracy

Working Principles

The INA138QPWRQ1 operates based on the principle of measuring the voltage drop across a shunt resistor placed in series with the load. By amplifying this voltage drop, the IC accurately measures the current flowing through the load. The differential inputs (IN+ and IN-) sense the voltage across the shunt resistor, while the internal amplifier amplifies the voltage difference. The amplified output is then provided at the OUT pin.

Detailed Application Field Plans

The INA138QPWRQ1 finds applications in various fields, including:

1. Automotive: Current monitoring in battery management systems, motor control, and power distribution.
2. Industrial: Precision current measurement in industrial automation, robotics, and power supplies.
3. Renewable Energy: Monitoring current in solar inverters and wind turbine control systems.
4. Telecommunications: Current sensing in telecom power supplies and network equipment.

Detailed and Complete Alternative Models

1. INA139QPWRQ1: Similar to the INA138QPWRQ1, but with a higher gain error of ±1%.
2. INA169QPWRQ1: A lower-cost alternative with slightly reduced accuracy and common-mode rejection ratio.
3. INA180AIDBVR: A high-side current shunt monitor IC with an integrated ADC for digital current measurements.

These alternative models offer different trade-offs in terms of accuracy, cost, and additional features, providing options based on specific application requirements.

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