Блог компании Mingjiada Supply TI INA281A1 20V/V Gain, High-Precision Current-Sense Amplifier

In motor drives, power management, battery charging and discharging, and industrial automation systems, the accuracy and response speed of current sensing directly affect control efficiency, protection reliability and system safety. The TI INA281A1 is a bidirectional current sense amplifier in the INA281 series with a gain of 20 V/V. Featuring a bandwidth of 1.3 MHz, a wide common-mode range of –4 V to 80 V and a low offset voltage, it is suitable for current sense designs requiring fast response and moderate gain. Mingjiada Electronics is a long-standing supplier of TI analogue and power management devices, offering corporate clients support with sample enquiries, small-batch procurement and BOM fulfilment for the INA281A1.

INA281A1 Product Overview

The INA281A1 is a high-precision current sense amplifier that measures the voltage drop across a shunt resistor over a wide common-mode range of –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground potential, enabling accurate measurement of recirculating currents in half-bridge applications. The combination of low offset voltage, low gain error and high DC CMRR enables high-precision current measurement. With a high bandwidth of 1.3 MHz and an AC CMRR of 65 dB (at 50 kHz), the INA281-Q1 is suitable not only for DC current measurement but also for high-speed applications (such as fast overcurrent protection).

Compared to standard current sense amplifiers, the INA281A1 offers a balance of a wide common-mode range, low offset voltage and high common-mode rejection ratio. The 20 V/V gain is suitable for amplifying signals with moderate shunt voltages, whilst the 1.3 MHz bandwidth facilitates rapid overcurrent detection and current sampling in switch-mode power supply loops.

Key parameters of the INA281A1:

Device model: INA281A1QDBVRQ1

Device type: Bidirectional current sense amplifier

Gain: 20 V/V

Bandwidth: 1.3 MHz

Common-mode input range: –4 V to 80 V

Supply voltage range: 2.7 V to 20 V

Offset voltage: Low offset, maximum approximately ±150 µV

Gain error: Maximum approximately ±0.5%

Common-mode rejection ratio (CMRR): High CMRR, typically approximately 140 dB

Quiescent current: approx. 370 µA (typical)

Operating temperature range: –40 °C to +125 °C

INA281A1 Product Features:

Wide common-mode voltage range:

Operating voltage: –4 V to +110 V

Withstand voltage: –20 V to +120 V

Excellent common-mode rejection ratio (CMRR):

120 dB DC CMRR

65 dB AC CMRR (at 50 kHz)

High bandwidth: 1.3 MHz

Slew rate: 2.5 V/µs

Quiescent current: 1.5 mA

Accuracy:

Gain:

Gain error: ±0.5% (maximum)

Gain drift: ±20 ppm/°C (maximum)

Offset voltage:

Offset voltage: ±55 µV (typical)

Temperature drift: ±0.1 µV/°C (typical)

Typical applications for the INA281A1:

Automatic transmissions

Automotive HVAC compressor modules

Valve/motor actuators

Petrol and diesel engine platforms

With a gain of 20 V/V, a bandwidth of 1.3 MHz, a common-mode range of –4 V to 80 V and bidirectional sensing capability, the TI INA281A1 is suitable for current sensing applications such as motor drives, power management, battery management and industrial automation. Mingjiada Electronics can provide support for the INA281A1, including sample enquiries, BOM order fulfilment and supply.

For further product information regarding the [TI] INA281A1 | 1.3 MHz current sense amplifier, or to enquire about sample prices, please visit the Mingjiada Electronics website (https://www.integrated-ic.com/) for further supply details.

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