INA301 Current-Sensing Amplifiers

Texas Instruments' INA301 includes both high common-mode, current-sensing amplifiers and high-speed comparators configured to detect overcurrent conditions. This is done by measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. These devices feature an adjustable limit threshold range that is set using a single external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert outputs can be configured to operate either in a transparent mode, where the output status follows the input state, or in a latched mode, where the alert output is cleared when the latch is reset. These devices' alert response time is under 1 µs, allowing for quick detection of overcurrent events.

These devices operate from a single 2.7 V to 5.5 V supply, drawing a maximum supply current of 700 µA. They are specified over the extended operating temperature range (-40°C to 125°C) and are available in an 8-pin VSSOP package.