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The RT9554A is designed for over-current detection. The current sense amplifier amplifies the voltage across resistor which is connected between CSP and CSN by 200. The amplified voltage is compared with the voltage of BAT_REF and check whether over-current happens or not. The RT9554A also provides a comparator with two input pins, AC_REAL and AC_REF for users. There is an output pin FLAG as an indicator which is a N-MOSFET in open-drain configuration. Users can connect one resistor between the FLAG pin and supply voltage. Either over-current condition occurs or the AC_REAL voltage is larger than the AC_REF voltage, the FLAG is pulled low. The RT9554A is a available in the WDFN-8L 2x2 package.
Common Mode Input Range up to 24V
VCC Operating Current : 200μA
VCC Shutdown Current : 5μA (under S3/S4/S5)
Programmable Over-Current Level
FLAG Signal goes Low when OCP
RoHS Compliant and Halogen Free
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