1 Features
• Precision design 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
• High small signal bandwidth : 1MHz
• Excellent CMRR
– 160dB DC CMRR
– 114dB AC CMRR at 50kHz
• High measurement accuracy
– System Gain error (maximum)
• Version A: ±0.35%, ±35ppm/°C drift
• Version B: ±1%, ±100ppm/°C drift
– Offset current (maximum)
• Version A: ±40mA, ±70mA over temperature
• Version B: ±210mA, ±250mA over
temperature
• Adjustable gain with external resistor divider
network: 20mV/A to 400mV/A
• Open-drain temperature alert at TJ of 160°C

2 Applications
• 48V DC/DC Converter
• 48V battery management systems (BMS)
• Test & Measurement
• Macro remote radio unit (RRU)
• 48V rack server
• 48V merchant network & server power supply
(PSU)

3 Description
The INA791x is a voltage output, current sense
amplifier with an integrated shunt resistor of 400μΩ.
The INA791x 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.
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.