The MAX4880 is an overvoltage-protection controller with an internal current-limited switch that can be configured as a low-cost battery charger. When the input voltage exceeds the overvoltage trip level (5.7V), or drops below the undervoltage-lockout level (4.2V), the MAX4880 turns off the external n-channel MOSFET and asserts an undervoltage/overvoltage flag indicator (FLAGV) low to notify the processor. The MAX4880 internal current-limited switch limits the charge current flowing to the battery to 525mA. The switch opens when the battery voltage reaches its fullcharged state (4.2V), and a flag (BAT_OK) asserts to notify the processor. The MAX4880 includes a switchcontrol input (CB) to turn off the internal current-limited switch, regardless of the battery voltage. The MAX4880 also features a built-in startup delay that allows the adapter voltage to settle down before turning on the MOSFET. Other features include 15kV ESD protection for the input and a shutdown function (EN) to turn off the external n-channel MOSFET. The MAX4880 is available in a space-saving 10-pin TDFN package and is specified for operation over the extended -40C to +85C temperature range.