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.