INA281A1QDBVRQ1

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 ℃ to +125 ℃ and is offered in a space-saving SOT-23 package with two pin-out variants.

Applications

• Automatic transmission
• Automotive HVAC compressor module
• Valve/motor actuator
• Gasoline & diesel engine platform
• Pump

Key features

• AEC-Q100 qualified for automotive applications – Temperature grade 1: -40 ℃ to +125 ℃, 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/℃ (maximum)
• Offset:
• Offset voltage: ±55 μV (typical)
• Offset drift: ±0.1 μV/℃ (typical)
• Available gains: 20 V/V, 50 V/V, 100 V/V, 200 V/V, 500 V/V
• High bandwidth: 1.3 MHz
• Slew rate: 2.5 V/µs
• Quiescent current: 1.5 mA