描述 Description

The INA280-Q1 is a current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. It is in a highly space-efficient SC-70 package with a PCB footprint of only 2.0 mm × 2.1 mm. The current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±150 μV (maximum), a small gain error of ±0.5% (maximum), and a high DC CMRR of 140 dB (typical). The INA280-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 1.1 MHz (at gain of 20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INA280-Q1 operates from a single 2.7-V to 20-V supply and draws a 370-μA supply current (typical). The INA280-Q1 available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset and drift of the INA280-Q1 enables accurate current sensing over the extended operating temperature range of ?40 °C to +125 °C.

特性 Features

? AEC-Q100 qualified for automotive applications:
? Temperature grade 1: –40 °C to +125 °C, TA

? Functional Safety-Capable
? Documentation available to aid functional safety system design

? Wide common-mode voltage:
? Operational voltage: 2.7 V to 120 V
? Survival voltage: ?20 V to +122 V

? Excellent CMRR:
? 120-dB DC (minimum)
? 85-dB AC at 50 kHz

? Accuracy
? Gain:
? Gain error: ±0.5% (maximum)
? Gain drift: ±20 ppm/°C (maximum)

? Offset:
? Offset voltage: ±150 μV (maximum)
? Offset drift: ±1 μV/°C (maximum)


? Available gains:
? INA280A1-Q1: 20 V/V
? INA280A2-Q1: 50 V/V
? INA280A3-Q1: 100 V/V
? INA280A4-Q1: 200 V/V
? INA280A5-Q1: 500 V/V

? High bandwidth: 1.1 MHz
? Slew rate: 2 V/μs
? Quiescent current: 370 μA