Maxim Integrated MAX4945ELA T

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.
All switches feature a minimum 1.2A current-limit protection. During a short-circuit occurrence, the MAX4944B and MAX4945B place the switch in a latchoff state where the switch turns off and remains off. For the autoretry devices, the switch turns off and continuously checks after a 15ms (typ) retry time.
The overvoltage thresholds (OVLO) are preset to 7.4V, 6.35V, 5.8V, 4.56V, or 8.9V. The undervoltage-lockout (UVLO) thresholds are preset to 2.45V and 4.15V. When the input voltage drops below the undervoltage-lockout (UVLO) threshold, the devices enter a low-current standby mode.
All devices are offered in a small, 8-pin DFN (2mm x 2mm) package and are specified for operation over the -40°C to 85°C temperature range.

Features
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
PDAs and Palmtop Devices
Digital Still Cameras
MP3 Players