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STEF05D：Electronic fuse for 5 V line

The STEF05D 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 STEF05D 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 signal led to the board monitoring circuits through a signal on the Fault pin.

Unlike mechanical fuses, which must be physically replaced after a single event, the E-fuse does not degrade in its performance after short-circuit/thermal protection interventions and it is reset either by recycling the supply voltage or using the Enable pin.

The companion chip for 12 V power rails is also available with part number STEF12.

Key Features

• Continuous current typ: 3.6 A
• N-channel on-resistance typ: 40 mΩ
• Enable/fault functions
• Output clamp voltage typ: 6.65 V
• Undervoltage lockout
• Short-circuit limit
• Overload current limit
• Controlled output voltage ramp
• Thermal latch typ: 165 °C
• Uses tiny capacitors
• Operating junction temp. - 40 °C to 125 °C
• Available in DFN10 (3 x 3 mm).

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