Overvoltage Protector With Active Current Limit

The MAX4978 MAX4979 MAX4980 MAX4981 overvoltage-protection devices protect low-voltage systems against voltage faults up to +28V and feature a low 85m RON FET an active cur- rent limiter, and lithium-ion battery overcharge protec- tion MAX4980 MAX4981 . These devices are used to protect the charger input port on a portable device. The overvoltage protector feature protects against volt- ages up to 28V with two different trip thresholds: 5.7V MAX4978 MAX4980 MAX4981 and 6.8V MAX4979 . There is an undervoltage protector with two different trip thresholds: 4.4V MAX4978 and 2.63V MAX4979 MAX4980 MAX4981 . By Maxim Integrated Products