The SY24634 includes a high common-mode, current-sensing amplifier, as well as a high-speed comparator that can be configured to detect under-current conditions. The Current Sense Amplifier is used to accurately measure a small voltage developed across a shunt resistor and provide a proportional analog value at its output.
The built-in comparator measures the voltage developed at the output of the Current Sense Amplifier and compares that voltage with an externally configured threshold. When the voltage at the Amplifier output is lower than the threshold, its open-drain output will be driven low, effectively enabling fast under-current detection in a system. A single external resistor can be used to configure the under-current threshold. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0V up to 36V, independent of the supply voltage.
The open-drain Alert Output can be configured to operate in either transparent mode or latched mode. The device alert response time is under 3μs, which allows for quick detection of under-current events.
The SY24634 operates from a single 2.7V to 5.5V supply, drawing a maximum supply current of 400μA.The device is specified over the extended operating temperature range (-40°C to +125°C), and is available in an 8-pin MSOP package.
