Positive Overvoltage Protection Controller with Internal Low RON NMOS FET
The NCP349 is able io disconnect the systems from its output pin when wrong input operating conditions are detected. The system is positive overvoltage protected up to +28 V.
This device uses an internal NMOS and therefore, no external device is necessary, reducing the system cost and the PCB area of the application board.
The NCP349 is able to instantaneously disconnect the output from the input, due to integrated Low Ron Power NMOS (65 mQ), if the input voltage exceeds the overvoltage threshold (OVLO) or falls below the undervoltage threshold (UVLO).
At powerup (EN pin = low level), the Voul turns on ton time after the Vjn exceeds the undervoltage threshold.
The NCP349 provides a negative going flag (FLAG) output, which alerts the system that a fault has occurred.
In addition, the device has ESD-protected input (15 kV Air) when bypassed with a 1.0 uFor larger capacitor.
Features
• Overvoltage Protection up to 28 V
• On-Chip Low RdS(od) NMOS Transistor: 65 mQ
• Internal Charge Pump
• Overvoltage Lockout (OVLO)
• Undervoltage Lockout (UVLO)
• Soft-Start
• Alert FLAG Output
• Shutdown £Л' Input
• Compliance to IEC61000-4-2 (Level 4)
8.0 kV (Contact) 15 kV (Air)
• ESD Ratings: Machine Model = В
Human Body Model = 2
• DFN6 1.6x2 mm Package
• This is a Pb-Free Device
Applications
• Cell Phones
• Camera Phones
• Digital Still Cameras
• Personal Digital Applications
• MP3 Players