Overview
The NIS5420MT7TXG is a cost-effective, resettable electronic fuse (eFuse) designed by onsemi. This component is engineered to enhance the reliability of various circuits, including hard drives, by protecting them from both catastrophic and shutdown failures. It buffers the load device from excessive input voltage, thereby safeguarding sensitive circuits. The NIS5420MT7TXG also features an overvoltage clamp circuit that limits the output voltage during transients, allowing the load circuit to continue operation without shutdown.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage, operating, steady-state (VCC to GND) | VIN | -0.6 | - | 18 | V |
| Transient Input Voltage (100 ms) | VIN | -0.6 | - | 25 | V |
| Operating Ambient Temperature Range | TA | -40 | - | 125 | °C |
| Operating Junction Temperature Range | TJ | -40 | - | 150 | °C |
| Continuous Current (TA = 25°C, 100 mm2 copper) | ID | - | - | 4.6 | A |
| Kelvin Short Circuit Current Limit (RLimit = 20 Ω) | ILim-SS | 1.76 | 2.1 | 2.64 | A |
| Kelvin Overload Current Limit (RLimit = 20 Ω) | ILim-OL | - | - | 4.2 | A |
| Thermal Shutdown Temperature | TSD | 150 | 175 | 200 | °C |
| Thermal Hysteresis (Auto-retry part only) | THyst | - | - | 45 | °C |
| Output Clamping Voltage | VClamp | 12.5 | - | 14.5 | V |
| Undervoltage Lockout | VUVLO | 6 | 6.5 | 7 | V |
Key Features
- Integrated Power Device: The NIS5420MT7TXG includes an integrated power FET, which is thermally protected to ensure reliable operation.
- No External Current Shunt Required: The device does not need an external current shunt, simplifying the circuit design.
- Internal Charge Pump: An internal charge pump is included to manage the device's operation efficiently.
- Internal Undervoltage Lockout Circuit: This circuit monitors the input voltage and switches the output to a high impedance state if the voltage drops below the specified level.
- Internal Overvoltage Clamp: The overvoltage clamp limits the output voltage during transients, protecting the load circuit.
- Load Current Monitor: The device allows real-time monitoring of the load current through the ISENSE pin.
- Thermal Protection: The device includes an internal temperature sensing circuit that shuts down the device if the temperature exceeds 175°C.
- ESD Ratings: Human Body Model (HBM) rated at 2000 V.
- RoHS Compliant: The device is Pb-free, halogen-free, and BFR-free, making it environmentally friendly.
Applications
- Hard Drives: Protects hard drives from excessive input voltage and other failures.
- Mother Board Power Management: Used in power management circuits on motherboards to ensure reliable operation.
- Fan Drives: Can be used to protect fan drives from overvoltage and overcurrent conditions.
Q & A
- What is the primary function of the NIS5420MT7TXG?
The primary function of the NIS5420MT7TXG is to act as a resettable electronic fuse, protecting circuits from excessive input voltage and other failures.
- What is the input voltage range for the NIS5420MT7TXG?
The input voltage range is from 8 V to 18 V.
- How does the overvoltage clamp circuit work?
The overvoltage clamp circuit monitors the output voltage and reduces the gate drive of the main FET if the input voltage exceeds the overvoltage value, thereby limiting the output voltage during transients.
- What is the purpose of the undervoltage lockout circuit?
The undervoltage lockout circuit switches the output to a high impedance state if the input voltage drops below the specified level, protecting the load circuit.
- How does the thermal protection work?
The device includes an internal temperature sensing circuit that shuts down the device if the temperature exceeds 175°C, and power can be restored by recycling the input power or toggling the enable pin.
- Can the NIS5420MT7TXG be used in fan drives?
- What is the typical continuous current rating for the NIS5420MT7TXG at 25°C?
The typical continuous current rating is 4.6 A.
- Is the NIS5420MT7TXG RoHS compliant?
- How does the load current monitor work?
The load current monitor allows real-time monitoring of the load current through the ISENSE pin.
- What is the ESD rating of the NIS5420MT7TXG?
The ESD rating is 2000 V according to the Human Body Model (HBM).
