The input overvoltage protection protects the device and downstream components connected to PMID, SYS, and BAT against damage from overvoltage on the input supply. When V_IN > V_OVP an OVP fault is determined to exist. During the OVP fault, the device turns the battery discharge FET on, sends a single 128-µs pulse on INT, and the FAULT bits are updated over I²C. Once the OVP fault is removed, after the deglitch time, t_{DGL_OVP}, STAT and FAULT bits are cleared and the device returns to normal operation. The FAULT bits are not cleared until they are read in from I²C after the OVP condition no longer exists. The OVP threshold for the device is set to operate from standard USB sources.

The input under-voltage status indication is used to notify the host or other device when the input voltage falls below a desired threshold. When V_IN < V_UVLO, after the deglitch time t_{DGL_UVLO}, a UVLO fault is determined to exist. During the V_IN UVLO fault, the device sends a single 128-µs pulse on INT, and the STAT and FAULT bits are updated over I²C. The FAULT bits are not cleared until they are read in from I²C after the UVLO condition no longer exists.