Overview
The NCP398, produced by onsemi, is an overvoltage protection device designed to safeguard VCONN against high-speed overvoltages originating from the VBUS supply. This IC is particularly useful in applications where VCONN is directly derived from the VBUS. The device features an integrated power MOSFET that is automatically controlled to reduce inrush current during power-up. It continuously monitors undervoltage, overvoltage, and thermal events, ensuring robust protection for connected systems.
Key Specifications
| Characteristics | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Range | VIN | - | - | 28 | V |
| Under Voltage Lockout (UVLO) | VIN rising | 2.4 | 2.8 | - | V |
| Over Voltage Lockout (OVLO) | VIN rising | 5.50 | 5.65 | 5.80 | V |
| Maximum DC Current | IMAX | - | - | 0.8 | A |
| Operating Ambient Temperature Range | TA | -40 | - | 85 | °C |
| Storage Temperature Range | TSTG | -65 | - | 150 | °C |
| Junction Operating Temperature | TJ | - | - | 125 | °C |
| Human Body Model (HBM) ESD Rating | ESD HBM | - | - | 2 kV | - |
| Charged Device Model (CDM) ESD Rating | ESD CDM | - | - | 1 kV | - |
| On-chip Low Rdson NMOS Transistors | Rdson | 190 | 220 | - | mΩ |
| Supply Quiescent Current | IDD | - | 40 | 60 | μA |
| OFF Current | IOFF | - | - | 1.5 | μA |
Key Features
- Over-voltage Protection up to +28 V
- On-chip low Rdson NMOS transistors: Typical 190 mΩ
- Under-voltage Lockout (UVLO)
- Over-voltage Lockout (OVLO)
- Shutdown EN Input
- Output Discharge Path
- Thermal Shutdown Protection
- Available in WLCSP4 (0.84 x 0.84 mm) and UDFN6 (2 x 2 mm) packages
Applications
- Type-C USB
- Smartphones
- Tablets
- Wearable devices
- Wireless devices
Q & A
- What is the primary function of the NCP398?
The NCP398 is an overvoltage protection device designed to protect VCONN against high-speed overvoltages coming from the VBUS supply.
- What are the package options for the NCP398?
The NCP398 is available in WLCSP4 (0.84 x 0.84 mm) and UDFN6 (2 x 2 mm) packages.
- What is the maximum input voltage the NCP398 can handle?
The NCP398 can handle a maximum input voltage of 28 V.
- What is the typical on-chip low Rdson NMOS transistor resistance?
The typical on-chip low Rdson NMOS transistor resistance is 190 mΩ.
- Does the NCP398 have thermal shutdown protection?
Yes, the NCP398 includes thermal shutdown protection to prevent overheating.
- How does the NCP398 handle undervoltage conditions?
The NCP398 features an under-voltage lockout (UVLO) comparator with built-in hysteresis to ensure proper operation under undervoltage conditions.
- What is the purpose of the EN pin on the NCP398?
The EN pin is used to enable or disable the device. A high level on this pin forces the internal switch off and reduces current consumption.
- Does the NCP398 have an output discharge path?
Yes, the NCP398 includes an output discharge path to eliminate residual voltage after the device is turned off.
- What are some common applications for the NCP398?
Common applications include Type-C USB, smartphones, tablets, wearable devices, and wireless devices.
- What are the ESD ratings for the NCP398?
The NCP398 has an ESD rating of 2 kV for Human Body Model (HBM) and 1 kV for Charged Device Model (CDM).
