Overview
The NCP380LMUAJAATBG is a high-side power-distribution switch designed by onsemi, specifically tailored for applications involving heavy capacitive loads and potential short-circuits. This device integrates an P-channel MOSFET and is available in a UDFN6 package. It features adjustable current-limiting capabilities, allowing users to set the current-limit threshold using an external resistor. The NCP380 protects the input supply voltage against overcurrent, reverse voltage, and thermal shutdown conditions, making it robust for various power distribution needs.
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 |
| Maximum DC Current (UDFN-6 Package) | IOUT | - | - | 2.1 | A |
| Static Drain-source On-state Resistance (UDFN Package) | RDS(on) | - | 55 | 75 | mΩ |
| Thermal Resistance Junction-to-Air (UDFN-6 Package) | RθJA | - | 120 | - | °C/W |
| FLAG Output Low Voltage | VOL | - | 400 | - | mV |
| FLAG Deglitch Time due to Overcurrent or Reverse Voltage Condition | TFLG | 4.0 | 6.0 | 9.0 | ms |
| Thermal Shutdown Threshold | TSD | - | 140 | - | °C |
Key Features
- Adjustable Current Limiting: The current-limit threshold can be set using an external resistor, allowing for a range of 500 mA to 2.1 A.
- Overcurrent Protection: Switches into a constant-current regulation mode when the output current exceeds the set threshold, protecting against overcurrent conditions.
- Reverse Voltage Protection: Disables the power switch if the output voltage is higher than the input voltage, safeguarding the input side devices.
- Thermal Shutdown: Turns off the power MOSFET if the die temperature exceeds the thermal shutdown threshold, with a hysteresis to prevent oscillation.
- FLAG Indicator: An open-drain output that asserts low during overcurrent, reverse-voltage, or overtemperature conditions, providing real-time fault indication.
- Soft Start Circuitry: Limits large current and voltage surges during startup, ensuring smooth operation.
- Enable Input: Controlled by a logic enable input that can be driven by CMOS or TTL compatible signals.
Applications
- USB Ports and Hubs: Ideal for protecting USB ports against overcurrent and short-circuit conditions, ensuring compliance with USB specifications.
- Power Distribution Systems: Suitable for various power distribution applications where heavy capacitive loads and short-circuits are common.
- Consumer Electronics: Used in consumer electronics to protect against overcurrent and thermal issues, enhancing device reliability.
- Industrial Control Systems: Applicable in industrial settings where robust power management and protection are critical).
Q & A
- What is the primary function of the NCP380LMUAJAATBG?
The NCP380LMUAJAATBG is a high-side power-distribution switch designed to protect against heavy capacitive loads, short-circuits, and overcurrent conditions.
- How can the current-limit threshold be adjusted?
The current-limit threshold can be adjusted using an external resistor connected to the ILIM pin, allowing for a range of 500 mA to 2.1 A.
- 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, providing real-time fault indication.
- What is the thermal shutdown threshold for the NCP380LMUAJAATBG?
The thermal shutdown threshold is 140°C, with a hysteresis to prevent oscillation.
- How is the enable input controlled?
The enable input can be controlled by a logic signal (CMOS or TTL compatible) or connected to ground. It can also be delayed using a 10 kΩ/100 nF RC network if necessary.
- What are the recommended PCB design considerations?
The PCB design should ensure proper heat evacuation, with the UDFN6 PAD1 connected to the ground plane to increase heat transfer.
- 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 static drain-source on-state resistance for the UDFN package?
The static drain-source on-state resistance for the UDFN package is typically 55 mΩ.
- How does the NCP380LMUAJAATBG protect against reverse voltage conditions?
The device disables the power switch if the output voltage exceeds the input voltage, protecting the input side devices.
- What are some common applications for the NCP380LMUAJAATBG?
Common applications include USB ports and hubs, power distribution systems, consumer electronics, and industrial control systems.
