INA281-Q1中文资料符合汽车类 AEC-Q100 标准的 -4V 至 110V、1.3MHz 电流感应放大器数据手册TI规格书

描述 Description

The INA281-Q1 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281-Q1 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).

The INA281-Q1 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281-Q1 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.

The INA281-Q1 is specified over an operating temperature range of −40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.

特性 Features

• AEC-Q100 qualified for automotive applications
• Functional Safety-Capable
• Wide common-mode voltage:
• Survival voltage: −20 V to +120 V
• Excellent CMRR:
• 65-dB AC CMRR at 50 kHz
• Accuracy:
• Gain error: ±0.5% (maximum)
• Offset:
• Offset drift: ±0.1 µV/°C (typical)
• Available gains:
• INA281A2-Q1, INA281B2-Q1 : 50 V/V
• INA281A4-Q1, INA281B4-Q1 : 200 V/V
• High bandwidth: 1.3 MHz
• Quiescent current: 1.5 mA