General Description
The MAX4943–MAX4946/MAX4949 family of overvoltage-protection devices feature a low 80mΩ (typ) RON internal FET and protect low-voltage systems against voltage faults up to +28V. These devices also drive an optional external pFET to protect down to -28V when connected to a load with reverse current protection. When the input voltage exceeds the overvoltage threshold, the internal FET is turned off to prevent damage to the protected components.

FEATUREs
♦ Input Voltage Protection Up to +28V
♦ Integrated nFET Switch
♦ Preset Overvoltage Protection Trip Level
    7.40V (MAX4943)
    6.35V (MAX4944_)
    5.80V (MAX4945_)
    4.56V (MAX4946)
    8.90V (MAX4949)
♦ Low-Current Undervoltage-Lockout Mode
♦ Short-Circuit Protection (Latchoff/Autoretry)
♦ Internal 15ms (typ) Startup Delay and Retry Times
♦ Input Voltage Power-Good Logic Output
♦ Thermal-Shutdown Protection
♦ Small, 8-Pin (2mm x 2mm) µDFN Package

APPLICATIONs
    Cell Phones
    Digital Still Cameras
    PDAs and Palmtop Devices
    MP3 Players