Overview
The NCP349MNAETBG is a Positive Overvoltage Protection Controller produced by onsemi. This device is designed to protect electronic systems from overvoltage conditions, ensuring reliable operation and preventing damage. It features an internal low RDS(on) NMOS FET, which eliminates the need for external components, reducing system cost and PCB area. The NCP349MNAETBG provides comprehensive protection against both overvoltage and undervoltage conditions, making it suitable for a variety of applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 1.2 | - | 28 | V |
| Operating Supply Current (No Load, EN = GND) | 70 | - | 150 | μA |
| Minimum Operating Temperature | -40 | - | - | °C |
| Undervoltage Lockout Threshold (UVLO) | 2.95 | 3.0 | 3.25 | V |
| Overvoltage Lockout Threshold (OVLO) | 5.68 | 6.0 | 6.40 | V |
| RDS(on) of NMOS FET | 65 | - | 110 | mΩ |
| FLAG Output Low Voltage | 20 | - | 400 | mV |
| Startup Delay (ton) | 1.0 | - | 6.0 | ms |
| Output Turn Off Time (toff) | 1.5 | - | 5.0 | μs |
Key Features
- Overvoltage Protection: Up to 28 V, protecting systems from positive overvoltage conditions.
- Internal Low RDS(on) NMOS FET: 65 mΩ, reducing system losses and eliminating the need for external components.
- Undervoltage Lockout (UVLO): Ensures the output remains disconnected until the input voltage exceeds the UVLO threshold.
- Overvoltage Lockout (OVLO): Disables the output if the input voltage exceeds the OVLO threshold.
- Soft-Start and Alert FLAG Output: Provides a negative-going flag output to alert the system of a fault, with an additional delay between output signal and FLAG signal.
- Shutdown EN Input: Allows for disabling the output by setting the EN pin to a high level.
- ESD Protection: Compliant with IEC61000-4-2, providing ±15 kV air and ±8.0 kV contact ESD protection.
- Pb-Free and DFN6 Package: 1.6x2 mm package, enhancing thermal performance and reducing PCB area.
Applications
- Cell Phones
- Camera Phones
- Digital Still Cameras
- Personal Digital Assistants
- MP3 Players
Q & A
- What is the maximum supply voltage for the NCP349MNAETBG?
The maximum supply voltage is 28 V.
- What is the purpose of the internal NMOS FET in the NCP349MNAETBG?
The internal NMOS FET protects the system from positive overvoltage conditions and reduces system losses.
- How does the NCP349MNAETBG handle undervoltage conditions?
The device has a built-in undervoltage lockout (UVLO) circuit that keeps the output disconnected until the input voltage exceeds the UVLO threshold.
- What is the function of the FLAG output in the NCP349MNAETBG?
The FLAG output alerts the system that a fault has occurred, such as exceeding the OVLO threshold or falling below the UVLO threshold.
- How do you disable the output of the NCP349MNAETBG?
The output can be disabled by setting the EN pin to a high level.
- What is the ESD protection level of the NCP349MNAETBG?
The device is compliant with IEC61000-4-2, providing ±15 kV air and ±8.0 kV contact ESD protection.
- What package type is the NCP349MNAETBG available in?
The device is available in a DFN6 package, measuring 1.6x2 mm.
- What are the typical applications of the NCP349MNAETBG?
Typical applications include cell phones, camera phones, digital still cameras, personal digital assistants, and MP3 players.
- How does the NCP349MNAETBG handle overvoltage conditions?
The device has a built-in overvoltage lockout (OVLO) circuit that disables the output if the input voltage exceeds the OVLO threshold.
- What is the significance of the startup delay (ton) in the NCP349MNAETBG?
The startup delay ensures a soft-start of the output after the input voltage exceeds the UVLO threshold, preventing inrush current issues.
