Overview
The NCP380LSNAJAAT1G, produced by onsemi, is a high-side power-distribution switch designed to handle applications with heavy capacitive loads and potential short-circuits. This device integrates a P-channel MOSFET and is available in both fixed and adjustable current-limiting versions. It protects the input supply voltage by switching into a constant-current regulation mode when the output current exceeds the set threshold or during short-circuit conditions. The NCP380 also features reverse-voltage detection, thermal shutdown, and an undervoltage lockout to ensure robust operation under various conditions.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operational Power Supply | VIN | 2.5 | - | 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 |
| Maximum DC Current (UDFN-6 Package) | IOUT | - | - | 2.1 | A |
| FLAG Output Low Voltage | VOL | - | - | 400 | mV |
| Thermal Shutdown Threshold | TSD | - | - | 140 | °C |
| ESD Withstand Voltage (IEC 61000-4-2) | ESD IEC | - | - | 15 | kV |
Key Features
- Current Limiting: Adjustable or fixed current limiting between 500 mA and 2.1 A using an external resistor for adjustable versions.
- Overcurrent Protection: Switches into constant-current regulation mode during overcurrent conditions.
- Reverse Voltage Protection: Disables the power switch if the output voltage exceeds the input voltage.
- Thermal Shutdown: Turns off the power MOSFET if the die temperature exceeds the thermal shutdown threshold.
- Undervoltage Lockout: Keeps the output disconnected from the input until the input voltage is above the undervoltage lockout threshold.
- FLAG Indicator: An open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions.
- Soft Start Circuitry: Limits large current and voltage surges during startup.
- Enable Input: Controlled by a logic signal (CMOS or TTL compatible) to turn the device on or off.
Applications
- USB Ports and Hubs: Ideal for protecting USB ports from overcurrent and short-circuit conditions.
- Power Distribution Systems: Used in systems requiring high-side power switching with current limiting.
- Consumer Electronics: Suitable for devices that require robust power management and protection.
- Industrial Control Systems: Protects against heavy capacitive loads and short-circuits in industrial environments.
Q & A
- What is the primary function of the NCP380?
The NCP380 is a high-side power-distribution switch designed to protect the input supply voltage from heavy capacitive loads, short-circuits, and overcurrent conditions.
- How is the current limit threshold set for the NCP380?
The current limit threshold can be set using an external resistor (for adjustable versions) or is internally fixed (for fixed versions).
- What is the purpose of the FLAG pin?
The FLAG pin is an open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions.
- What is the thermal shutdown threshold for the NCP380?
The thermal shutdown threshold is 140°C.
- How does the NCP380 handle reverse voltage conditions?
The device disconnects the output if the output voltage exceeds the input voltage to protect the power supply.
- What is the maximum DC current for the UDFN-6 package?
The maximum DC current for the UDFN-6 package is 2.1 A.
- What is the purpose of the undervoltage lockout (UVLO) circuitry?
The UVLO circuitry keeps the output disconnected from the input until the input voltage is above the undervoltage lockout threshold.
- How is the enable input controlled?
The enable input is controlled by a logic signal (CMOS or TTL compatible) to turn the device on or off.
- What are the recommended resistor values for the adjustable current limit version?
The recommended resistor values range from 5 kΩ to 250 kΩ for adjustable current limit versions.
- What are some common applications for the NCP380?
The NCP380 is commonly used in USB ports, power distribution systems, consumer electronics, and industrial control systems.
