Overview
The NCP380HMU05AATBG, produced by onsemi, is a high-side power-distribution switch designed to handle applications with heavy capacitive loads and potential short-circuits. This device features an integrated P-channel MOSFET and is available in various packages, including the UDFN6 package. It is engineered to protect the input supply voltage from overcurrent, reverse voltage, and thermal shutdown conditions. The NCP380 also includes a soft-start circuit to mitigate large current and voltage surges during startup.
Key Specifications
| Parameter | Symbol | Min | 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 |
| Current Limit (Adjustable) | - | 500 mA | - | 2.1 A | A |
| Current Limit (Fixed) | - | 500 mA, 1 A, 1.5 A, 2 A, 2.1 A | - | - | A |
| Static Drain-source On-state Resistance (DFN Package) | RDS(on) | - | 55 | 75 | mΩ |
| ESD Withstand Voltage (IEC 61000-4-2) | ESD IEC | - | - | 15 kV (Air), 8 kV (Contact) | kV |
| Thermal Shutdown Threshold | TSD | - | - | 140 | °C |
Key Features
- Current Limiting: User-adjustable current limit from 500 mA to 2.1 A or fixed at 500 mA, 1 A, 1.5 A, 2 A, and 2.1 A.
- Under Voltage Lock-out (UVLO): Prevents the output from connecting to the input until the input voltage exceeds the UVLO threshold.
- Soft-start and Soft Turn-off: Reduces current and voltage surges during startup and shutdown.
- Thermal Protection: Turns off the power MOSFET if the junction temperature exceeds the thermal shutdown threshold.
- Reverse Voltage Protection: Disconnects the output if the output voltage exceeds the input voltage.
- FLAG Indicator: An active-low open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions.
- Enable Input: Logic-compatible enable input that can be driven high or low to control the power switch.
- Compliance: Meets IEC61000-4-2 (Level 4) and UL Listed (File No. E343275 for NCP versions).
- Pb-Free Devices: Compliant with lead-free requirements.
Applications
- Laptops
- USB Ports/Hubs
- TVs
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 set on the NCP380?
The current limit can be set either by using an external resistor (adjustable version) or is fixed at specific values (500 mA, 1 A, 1.5 A, 2 A, 2.1 A).
- What is the purpose of the FLAG pin?
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 for the NCP380?
The thermal shutdown threshold is 140°C.
- Does the NCP380 have reverse voltage protection?
Yes, the NCP380 includes reverse voltage protection that disconnects the output if the output voltage exceeds the input voltage.
- How does the soft-start feature work?
The soft-start circuitry limits large current and voltage surges during startup.
- What are the typical applications for the NCP380?
The NCP380 is typically used in laptops, USB ports/hubs, and TVs.
- Is the NCP380 Pb-free?
Yes, the NCP380 is a Pb-free device.
- What is the ESD withstand voltage for the NCP380?
The ESD withstand voltage is 15 kV (Air) and 8 kV (Contact) according to IEC 61000-4-2.
- How is the enable input controlled?
The enable input can be controlled by a logic signal (CMOS or TTL compatible) and can be driven high or low to turn the device on or off.
