Overview
The INA281B1-QDBVRQ1 from Texas Instruments is a high-precision, AEC-Q100 qualified current-sense amplifier designed for automotive and other high-reliability applications. This device offers a wide common-mode voltage range from -4 V to 110 V, making it suitable for both low- and high-side current-sensing applications. The INA281B1-QDBVRQ1 features a high bandwidth of 1.3 MHz and a fast slew rate of 2.5 V/µs, enabling rapid detection and processing of overcurrent events. It operates from a single supply voltage of 2.7 V to 20 V and is available in a space-saving SOT-23 package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-Mode Voltage Range | -4 to 110 | V |
| Bandwidth | 1.3 MHz | |
| Gain Options | 20 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V | |
| Slew Rate | 2.5 V/µs | |
| Quiescent Current | 1.5 mA | |
| Supply Voltage | 2.7 to 20 V | |
| Operating Temperature Range | -40 to +125 °C | |
| Offset Voltage (Input Referred) | ±55 µV (typical) | |
| Gain Error | ±0.5% (maximum) | |
| Common-Mode Rejection Ratio (CMRR) | 120 dB (DC), 65 dB (AC at 50 kHz) |
Key Features
- Wide Common-Mode Voltage Range: Operates from -4 V to 110 V, allowing for use in both low- and high-side current-sensing applications.
- High Bandwidth and Slew Rate: 1.3 MHz bandwidth and 2.5 V/µs slew rate for fast response and high-speed applications.
- Precision and Accuracy: Low offset voltage, small gain error, and high DC CMRR ensure highly accurate current measurements.
- Multiple Gain Options: Available in five gain options (20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V) to address a wide dynamic range for current-sensing applications.
- Compact Packaging: Offered in a space-saving SOT-23 package with two pin-out variants.
Applications
- Automotive Systems: Suitable for automatic transmission, automotive HVAC compressor modules, valve/motor actuators, and gasoline & diesel engine platforms.
- Power Supplies and Servers: Can be used in power supply units and server applications requiring high-precision current sensing.
- Industrial and Consumer Electronics: Applicable in various industrial and consumer electronics where precise current measurement is critical.
Q & A
- What is the common-mode voltage range of the INA281B1-QDBVRQ1?
The common-mode voltage range is from -4 V to 110 V.
- What are the gain options available for the INA281B1-QDBVRQ1?
The device is available with gain options of 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V.
- What is the bandwidth of the INA281B1-QDBVRQ1?
The bandwidth is 1.3 MHz.
- What is the slew rate of the INA281B1-QDBVRQ1?
The slew rate is 2.5 V/µs.
- What is the quiescent current of the INA281B1-QDBVRQ1?
The quiescent current is 1.5 mA.
- What is the operating temperature range of the INA281B1-QDBVRQ1?
The operating temperature range is from -40 °C to +125 °C.
- What is the typical offset voltage of the INA281B1-QDBVRQ1?
The typical offset voltage is ±55 µV.
- What is the common-mode rejection ratio (CMRR) of the INA281B1-QDBVRQ1?
The CMRR is 120 dB (DC) and 65 dB (AC at 50 kHz).
- In what package is the INA281B1-QDBVRQ1 available?
The device is available in a SOT-23 package.
- What are some typical applications of the INA281B1-QDBVRQ1?
Typical applications include automotive systems, power supplies, and industrial electronics.
