The STEF05 is an integrated electronic fuse optimized for monitoring output current and input voltage. Connected in series to a 5 V rail, it is capable of protecting the electronic circuitry on its output from overcurrent and overvoltage. The device has a controlled delay and turn-on time. When an overload condition occurs, the STEF05 limits the output current to a predefined safe value. If the anomalous overload condition persists, it goes into an open state, disconnecting the load from the power supply. If a continuous short-circuit is present on the board, when power is re-applied the E-fuse initially limits the output current to a safe value, and then again goes into an open state. The device is equipped with a thermal protection circuit. The intervention of the thermal protection is signalled to the external circuit, indicating that there is a short circuit.
The STEF05 is an integrated electronic fuse optimized for monitoring output current and input voltage on 5V rails. It protects electronic circuitry from overcurrent and overvoltage conditions by limiting current to a safe value or disconnecting the load entirely. The device features a controlled delay and turn-on time, utilizing an internal dv/dt circuit to ramp up the output voltage.
| Continuous current (typ) | 3.6 A |
|---|---|
| N-channel on-resistance (typ) | 40 mΩ |
| Output clamp voltage (typ) | 6.65 V |
| Thermal latch (typ) | 165 °C |
| Operating junction temp. | -40 °C to 125 °C |
| Package | DFN10 (3x3 mm) |
The typical continuous current is 3.6 A.
If a continuous short-circuit is present, the device initially limits the output current to a safe value and then goes into an open state to disconnect the load.
The device is reset either by recycling the supply voltage or using the Enable pin.