Current-sensing comparator configured to detect over-current conditions

This post is sponsored by Texas Instruments. The Texas Instruments (TI) INA300 is a high common-mode, current-sensing comparator is configured to detect over-current conditions through measuring the voltage developed across a current sensing or shunt resistor. The device can measure this differential voltage signal on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage. The device features an adjustable threshold range that is set using a single external limit-setting resistor. A selectable hysteresis feature enables adjustable operation of the comparator to accommodate the wide input signal range of 0mV to 250mV. An open-drain alert output on the device can be configured to operate 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 cleared. The device response time setting is selectable, enabling overcurrent alerts to be issued in as quickly as 10µs. This device operates from a single 2.7V to 5.5V supply, drawing a maximum supply current of 135 µA. It is specified over the extended operating temperature range (-40C to +125C) and is available in a QFN-10 package.