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

• Precision design with integrated shunt resistor

– ±35A continuous current at 25°C

– ±25A continuous current from at 125°C

– Shunt resistor: 800μΩ

– Shunt inductance: 2.5nH

• Wide common-mode voltage range: –4V to +110V

• High small signal bandwidth : 1MHz

• Excellent CMRR

– 160dB DC CMRR

– 114dB AC CMRR at 50kHz

• High measurement accuracy

– System Gain error (maximum)

• Version A: ±0.4%, ±40ppm/°C drift

• Version B: ±1%, ±100ppm/°C drift

– Offset current (maximum)

• Version A: ±20mA, ±35mA over temperature

• Version B: ±105mA, ±125mA over temperature

• Adjustable gain with external resistor divider network: 40mV/A to 800mV/A

• Open-drain temperature alert at TJ of 160°C

2 Applications

• DC/DC converter

• Battery management systems (BMS)

• Fuel cell control unit

• Smart junction box

3 Description

The INA751x-Q1 is a voltage output, current sense amplifier with an integrated shunt resistor of 800μΩ. The INA751x-Q1 is designed to monitor bidirectional current over a common-mode range of –4V to +110V, independent of the supply voltage. Adjustable gain option assists in optimizing the system dynamic range. The integration of the Kelvin connected shunt resistor with a zero-drift chopped amplifier provides calibration equivalent measurement accuracy, ultralow temperature drift performance of ±40ppm/°C, and an optimized layout for the sensing resistor.

This device operates from a single 2.7V to 5.5V power supply, drawing a maximum of 4.25mA of supply current. All versions are specified over the extended operating temperature range (–40°C to +125°C), and are available in a 14-pin wettable flank VQFN

package.