INA281A2QDBVRQ1 high Precision Current Sense Amplifier Automotive amplifiers and comparators

1 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: −4 V to +110 V

– Survival voltage: −20 V to +120 V

• Excellent CMRR:

– 120-dB DC CMRR

– 65-dB AC CMRR at 50 kHz

• Accuracy: – Gain:

• Gain error: ±0.5% (maximum)

• Gain drift: ±20 ppm/°C (maximum) – Offset:

• Offset voltage: ±55 µV (typical)

• Offset drift: ±0.1 µV/°C (typical)

• Available gains:

– INA281A1-Q1, INA281B1-Q1 : 20 V/V

– INA281A2-Q1, INA281B2-Q1 : 50 V/V

– INA281A3-Q1, INA281B3-Q1 : 100 V/V

– INA281A4-Q1, INA281B4-Q1 : 200 V/V

– INA281A5-Q1, INA281B5-Q1 : 500 V/V

• High bandwidth: 1.3 MHz

• Slew rate: 2.5V/µs

• Quiescent current: 1.5 mA

2 Applications

• Automatic transmission

• Automotive HVAC compressor module

• Valve/motor actuator

• Gasoline & diesel engine platform

• Pump

3 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 currentsensing 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.

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