Overview
The NCP380LMU10AATBG, produced by onsemi, is a high-side power-distribution switch designed to protect input supply voltages from heavy capacitive loads, short circuits, and overcurrent conditions. This device features an integrated P-channel MOSFET and is available in both fixed and adjustable current-limiting versions. The NCP380 is particularly useful in applications where robust current limiting and protection against various fault conditions are essential.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operational Power Supply | VIN | 2.5 | - | 5.5 | V |
| Enable Voltage | VEN | 0 | - | 5.5 | V |
| Ambient Temperature Range | TA | -40 | 25 | 85 | °C |
| Junction Temperature Range | TJ | -40 | 25 | 125 | °C |
| Static Drain-source On-state Resistance (DFN Package) | RDS(on) | - | 55 | 75 | mΩ |
| Static Drain-source On-state Resistance (TSOP Package) | RDS(on) | - | 70 | 95 | mΩ |
| Output Rise Time | TR | - | - | - | ms |
| FLAG Output Low Voltage | VOL | - | 400 | - | mV |
| Thermal Shutdown Threshold | TSD | - | 140 | - | °C |
Key Features
- Current Limiting: The NCP380 can limit the output current to a desired level, either fixed or adjustable via an external resistor, between 500 mA and 2.1 A.
- Overcurrent Protection: Switches into a constant-current regulation mode when the output current exceeds the current-limit threshold or during a short circuit.
- Reverse-Voltage Protection: An internal reverse-voltage detection comparator disables the power switch if the output voltage is higher than the input voltage.
- Thermal Shutdown: Protects the device from irreversible damage due to power dissipation by shutting down at a thermal threshold.
- FLAG Indicator: An active-low open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions.
- Soft Start Circuitry: Limits large current and voltage surges during startup.
- Under Voltage Lockout (UVLO): Ensures the output remains disconnected from the input until the input voltage is above the UVLO threshold.
Applications
- USB Ports and Hubs: Ideal for protecting USB ports from overcurrent and short-circuit conditions.
- Power Distribution Systems: Suitable for applications requiring robust current limiting and protection against various fault conditions.
- Consumer Electronics: Used in devices such as smartphones, tablets, and other portable electronics to ensure safe and reliable power distribution.
- Industrial and Automotive Systems: Can be used in industrial and automotive applications where reliable power distribution and protection are critical.
Q & A
- What is the operating voltage range of the NCP380?
The NCP380 operates within a voltage range of 2.5 V to 5.5 V.
- How is the current limit threshold set in the NCP380?
The current limit threshold can be set either internally (fixed) or externally using an adjustable resistor (RILIM) between 5 kΩ and 250 kΩ.
- What is the purpose of the FLAG pin in the NCP380?
The FLAG pin is an active-low open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions.
- What is the thermal shutdown threshold of the NCP380?
The thermal shutdown threshold is 140°C.
- How does the NCP380 protect against reverse voltage?
The NCP380 includes an internal reverse-voltage detection comparator that disables the power switch if the output voltage is higher than the input voltage.
- What is the maximum DC current rating for the NCP380 in the UDFN-6 package?
The maximum DC current rating for the UDFN-6 package is up to 2 A, depending on thermal considerations.
- What is the purpose of the soft start circuitry in the NCP380?
The soft start circuitry limits large current and voltage surges during startup.
- How does the under voltage lockout (UVLO) feature work in the NCP380?
The UVLO ensures the output remains disconnected from the input until the input voltage is above the UVLO threshold, providing noise immunity to transient voltages.
- What are the recommended PCB design rules for the NCP380?
The PCB design must ensure proper heat evacuation, with the UDFN6 PAD1 connected to the ground plane to increase heat transfer.
- What are some common applications of the NCP380?
The NCP380 is commonly used in USB ports, power distribution systems, consumer electronics, and industrial and automotive systems.
