Overview
The INA181A4IDBVR is a bidirectional, low- and high-side voltage output, current-sense amplifier produced by Texas Instruments. This device is part of the INA181 family, which is designed to sense voltage drops across current-sense resistors at common-mode voltages ranging from –0.2 V to +26 V, independent of the supply voltage. The INA181A4IDBVR operates from a single 2.7-V to 5.5-V power supply and is available in a 6-pin SOT-23 package.
This amplifier is optimized for cost and performance, making it suitable for various applications requiring accurate current measurement. It integrates a matched resistor gain network, which minimizes gain error and reduces temperature drift.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VS) | 2.7 | 5.5 | V | |
| Common-Mode Range (VCM) | –0.2 | +26 | V | |
| Offset Voltage at VCM = 0 V | ±150 µV | |||
| Offset Voltage at VCM = 12 V | ±500 µV | |||
| Output Slew Rate | 2 V/µs | |||
| Bandwidth (A4 Devices) | 105 kHz | |||
| Gain (A4 Devices) | 200 V/V | |||
| Quiescent Current | 195 | 260 µA | ||
| Operating Free-Air Temperature | –40 | +125 | °C | |
| Junction Temperature | 150 | °C | ||
| Storage Temperature | –65 | 150 | °C |
Key Features
- Bidirectional Current-Sensing Capability: The INA181A4IDBVR can measure current in both directions.
- High Bandwidth: Supports small-signal bandwidths up to 350 kHz for A1 devices and 105 kHz for A4 devices.
- Low Offset Voltage: Maximum offset voltage of ±150 µV at VCM = 0 V and ±500 µV at VCM = 12 V.
- High Accuracy: ±1% gain error and 1-µV/°C offset drift.
- Fixed Gain Options: Available in four fixed-gain options: 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- Low Quiescent Current: Maximum quiescent current of 260 µA.
- Wide Operating Temperature Range: Specified over the extended operating temperature range of –40°C to +125°C.
- Compact Package: Available in a 6-pin SOT-23 package.
Applications
- Motor Control: Used in motor control systems to monitor and control current flow.
- Battery Monitoring: Suitable for battery management systems to measure current and voltage.
- Power Management: Applied in power management circuits to sense and regulate current.
- Lighting Control: Used in lighting control systems to monitor and adjust current levels.
- Overcurrent Detection: Utilized for detecting overcurrent conditions in various electronic systems.
Q & A
- What is the common-mode range of the INA181A4IDBVR?
The common-mode range is from –0.2 V to +26 V.
- What are the gain options available for the INA181 family?
The gain options are 20 V/V, 50 V/V, 100 V/V, and 200 V/V.
- What is the maximum quiescent current of the INA181A4IDBVR?
The maximum quiescent current is 260 µA.
- What is the operating temperature range of the INA181A4IDBVR?
The operating temperature range is from –40°C to +125°C.
- What is the bandwidth of the INA181A4IDBVR?
The bandwidth for A4 devices is 105 kHz.
- What is the output slew rate of the INA181A4IDBVR?
The output slew rate is 2 V/µs.
- What are the typical applications of the INA181A4IDBVR?
Typical applications include motor control, battery monitoring, power management, lighting control, and overcurrent detection.
- What is the package type of the INA181A4IDBVR?
The device is available in a 6-pin SOT-23 package.
- What is the maximum offset voltage of the INA181A4IDBVR at VCM = 0 V?
The maximum offset voltage at VCM = 0 V is ±150 µV.
- What is the gain error of the INA181A4IDBVR?
The gain error is ±1% maximum.
