The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speedcomparator. This device detects overcurrent conditions by measuring the voltage developed across acurrent-shunt resistor and comparing that voltage to a user-defined threshold limit set by thecomparator reference pin. The current-shunt monitor can measure differential voltage signals oncommon-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.
The open-drain alert output can be configured to operate in two modes: transparent orlatched. In transparent mode, the output status follows the input state. In latched mode, the alertoutput is cleared only when the latch is reset. The standalone comparator large-signal alertresponse time is less than 2 µs, allowing for quick detection of overcurrent events. The totalsystem overcurrent protection response time provided by the INA381 is less than 10 µs.
This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supplycurrent of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C,and is available in 8-pin WSON and 10-pin VSSOP packages.