1 Features
• Precision solution with integrated shunt resistor
– ±75A continuous current at 25°C
– ±50A continuous current at +125°C
– Shunt resistor: 400μΩ
– Shunt inductance: 2nH
• Wide common-mode voltage range: –4V to +110V
• Enhanced PWM rejection optimized for systems
subject to switching common-mode voltages
– Supports switching frequencies up to 125kHz
• Excellent CMRR
– 160dB DC CMRR
– 114dB AC CMRR at 50kHz
• High measurement accuracy
– System Gain error (maximum)
• Version A: ±0.35%, ±35ppm/°C drift
• Version B: ±1%, ±100ppm/°C drift
– Offset current (maximum)
• Version A: ±30mA, ±625μA/°C drift
• Version B: ±250mA, ±1.25mA/°C drift
• Adjustable gain with external resistor divider
network:
– 20mV/A to 400mV/A
• Open-drain temperature alert at TJ of 160°C
• Package options: VQFN-15

2 Applications
• Motor drives
• Solenoids and actuators
• Injection molding machine
• Cordless power tools
• Medical cordless tools
• Drone propeller speed control

3 Description
The INA790x is a voltage output, current sense
amplifier with an integrated shunt resistor of 400μΩ.
The INA790x 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 ±35ppm/°C, and
an optimized layout for the sensing resistor.
The INA790x is designed with enhanced PWM
rejection circuitry to suppress disturbance from large
(dv/dt) common-mode transients and enable realtime
continuous current measurements in switching
systems. The continuous measurements are critical
for inline current measurements in a motor-drive
application, and for solenoid valve control application.
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 15-pin VQFN package.