Current sense amplifier with integrated over-current comparator

The Texas Instruments INA381 includes both a 26V common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-shunt resistor and comparing that voltage to a defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from –0.2V up to 26V, independent of the supply voltage. The open-drain alert output can be configured to run in either 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. The standalone comparator alert response time is under 3µs, allowing for quick detection of overcurrent events. The total system overcurrent protection provided by the device is under 10µs. This device operates from a single 2.7V to 5.5V supply, drawing a maximum supply current of 350µA. The device is specified over the extended operating temperature range (-40C to +125C) and is available in an 8-pin WSON package.