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, ultra-low 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 3.75mA 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.
PIN | Type | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
ALERT | 14 | Digital Out | Open-drain temperature alert |
FB | 12 | Analog Input | Gain adjustment feedback; connect to resistor divider to adjust device gain |
GND | 5 | Analog | Ground |
IN– | 9 | Analog Input | Kelvin connection to internal shunt on load side and negative amplifier input |
IN+ | 1 | Analog Input | Kelvin connection to internal shunt on supply side and positive amplifier input |
IS– | 8 | Analog Input | Connect to load |
IS+ | 15 | Analog Input | Connect to supply |
NC | 2 | – | Connect to IN+ (Pin 1) |
NC | 4, 6, 7 | – | Connect to ground or leave unconnected |
NC | 10 | – | Connect to IN– (Pin 9) |
OUT | 11 | Analog Output | Output voltage |
REF | 13 | Analog Input | Reference voltage, 0V to VS |
VS | 3 | Analog | Power supply, 2.7V to 5.5V |