INA250A4PW

Product Overview

Category: Integrated Circuit (IC)

Use: The INA250A4PW is a precision current-sensing IC designed for use in various applications that require accurate current measurements. It is commonly used in power management systems, battery chargers, motor control circuits, and other electronic devices.

Characteristics: - High accuracy: The INA250A4PW offers exceptional accuracy in current sensing, allowing for precise measurements. - Wide input voltage range: It can operate with input voltages ranging from 2.7V to 5.5V, making it suitable for a wide range of applications. - Low offset voltage: The IC has a low offset voltage, ensuring minimal errors in current measurements. - Small package size: The INA250A4PW comes in a small SOT-23 package, which makes it ideal for space-constrained designs. - Low power consumption: It consumes very low power, making it energy-efficient.

Package and Quantity: The INA250A4PW is available in a SOT-23 package. It is typically sold in reels containing 3000 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Input Common-Mode Voltage Range: -0.3V to Vcc+0.3V
• Operating Temperature Range: -40°C to +125°C
• Gain Error: ±0.5%
• Offset Voltage: ±50µV
• Bandwidth: 200kHz

Pin Configuration

The INA250A4PW has four pins arranged as follows:

```

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| | --| V+ OUT |-- --| GND REF |-- |___________| ```

1. V+: Positive supply voltage pin.
2. OUT: Output pin for the sensed current.
3. GND: Ground reference pin.
4. REF: Reference voltage pin.

Functional Features

• High-side or low-side current sensing: The INA250A4PW can be used for both high-side and low-side current sensing applications, providing flexibility in circuit design.
• Integrated shunt resistor: It incorporates an internal precision shunt resistor, eliminating the need for an external shunt resistor.
• Programmable gain: The IC allows for programmable gain, enabling customization of the current measurement range.
• Overcurrent detection: It features an overcurrent detection function that can be used to trigger protective measures in the system.

Advantages and Disadvantages

Advantages: - High accuracy and precision - Wide input voltage range - Small package size - Low power consumption - Integrated shunt resistor simplifies design

Disadvantages: - Limited bandwidth (200kHz) - Requires careful PCB layout for optimal performance

Working Principles

The INA250A4PW utilizes a current-shunt voltage measurement technique to accurately sense the current flowing through the load. It measures the voltage drop across the internal shunt resistor and converts it into a proportional output voltage. This output voltage can then be amplified and processed to obtain the desired current measurement.

Application Field Plans

The INA250A4PW finds extensive use in various applications, including:

1. Power management systems: It is employed in power supplies, DC-DC converters, and voltage regulators to monitor and control the current flow.
2. Battery chargers: The IC is used in battery charging circuits to measure the charging/discharging currents accurately.
3. Motor control circuits: It enables precise current monitoring in motor control applications, ensuring efficient and safe operation.
4. Energy monitoring systems: The INA250A4PW is utilized in energy monitoring devices to measure and track power consumption.

Alternative Models

Here are some alternative models that can be considered as alternatives to the INA250A4PW:

1. INA219: This IC offers similar functionality but with a higher bandwidth and additional features like bus voltage measurement.
2. ACS712: It is a Hall-effect-based current sensor that provides galvanic isolation and high immunity to noise.
3. MAX4080: This precision current-sensing IC offers a wide input voltage range and high accuracy.

These alternative models can be evaluated based on specific application requirements to determine the most suitable choice.

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