Overview
The NCP349MNTBG, produced by onsemi, is a Positive Overvoltage Protection Controller designed to protect electronic systems from overvoltage and undervoltage conditions. This device integrates an internal low RDS(on) NMOS FET, eliminating the need for external components and reducing system cost and PCB area. It provides instantaneous disconnection of the output from the input if the input voltage exceeds the overvoltage threshold (OVLO) or falls below the undervoltage threshold (UVLO). The NCP349 also features a soft-start function, an alert FLAG output, and a shutdown EN input, making it a comprehensive solution for voltage protection in various applications.
Key Specifications
| Characteristic | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Voltage Range | Vin | - | 1.2 | - | 28 | V |
| Undervoltage Lockout Threshold | UVLO | Vin falls below UVLO threshold from 5 V to 2.7 V | 2.8 | 3.0 | 3.25 | V |
| Undervoltage Lockout Hysteresis | UVLOhyst | Vin rises above UVLO + UVLOhyst | 30 | 60 | 90 | mV |
| Overvoltage Lockout Threshold | OVLO | - | 5.68 | - | 6.85 | V |
| Output Turn Off Time | toff | From Vin > OVLO to Vout <= 0.3 V | 1.5 | - | 5.0 | μs |
| Alert Delay | tstop | From Vin > OVLO to FLAG <= 0.4 V | 1.0 | - | - | μs |
| Disable Time | tdis | From EN >= 1.2 V to Vout < 0.3 V | 1.0 | - | 5.0 | μs |
| ESD Ratings (Air) | - | - | - | - | 15 kV | - |
| ESD Ratings (Contact) | - | - | - | - | 8.0 kV | - |
| Package Type | - | - | - | - | DFN6 1.6x2 mm | - |
Key Features
- Overvoltage Protection up to 28 V
- On-Chip Low RDS(on) NMOS Transistor: 65 mΩ
- Internal Charge Pump
- Overvoltage Lockout (OVLO) and Undervoltage Lockout (UVLO)
- Soft-Start Function
- Alert FLAG Output
- Shutdown EN Input
- Compliance to IEC61000-4-2 (Level 4)
- ESD Ratings: Machine Model = B, Human Body Model = 2
- Pb-Free Device
Applications
- Cell Phones
- Camera Phones
- Digital Still Cameras
- Personal Digital Applications
- MP3 Players
Q & A
- What is the primary function of the NCP349MNTBG?
The primary function of the NCP349MNTBG is to provide overvoltage and undervoltage protection for electronic systems.
- What is the maximum overvoltage protection provided by the NCP349MNTBG?
The NCP349MNTBG provides overvoltage protection up to 28 V.
- What is the RDS(on) of the internal NMOS FET in the NCP349MNTBG?
The RDS(on) of the internal NMOS FET is 65 mΩ.
- What is the purpose of the FLAG output in the NCP349MNTBG?
The FLAG output alerts the system that a fault has occurred, such as exceeding the OVLO or falling below the UVLO threshold.
- How does the EN input affect the operation of the NCP349MNTBG?
The EN input allows the device to enter shutdown mode when tied to a high level, disconnecting the output from the input.
- What are the ESD ratings for the NCP349MNTBG?
The NCP349MNTBG has ESD ratings of 15 kV (Air) and 8.0 kV (Contact) when bypassed with a 1.0 μF or larger capacitor.
- What package type is the NCP349MNTBG available in?
The NCP349MNTBG is available in a DFN6 1.6x2 mm package.
- Is the NCP349MNTBG a Pb-Free device?
Yes, the NCP349MNTBG is a Pb-Free device.
- What are some typical applications for the NCP349MNTBG?
Typical applications include cell phones, camera phones, digital still cameras, personal digital applications, and MP3 players.
- How does the soft-start function work in the NCP349MNTBG?
The soft-start function ensures that the output voltage rises gradually after the input voltage exceeds the undervoltage threshold, preventing inrush currents.
