STEF4SPUR

STEF4SPUR is an integrated electronic fuse optimized for monitoring the output current and the input voltage. It can be connected in series to 3.3V or 5V rails, protecting the electronic circuitry on its output from overcurrent and overvoltage. The operating mode (5V or 3.3V) can be selected by a dedicated pin. This device has a controlled turn-on time, adjustable by an external capacitor. When an overload condition occurs, the device 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, the E-fuse limits the output current to a safe value. In case of overvoltage on the input, the device clamps the output voltage to a predefined value and protects the load. It is used in applications such as hard disk drives, solid state drives (SSD), hard disk and SSD arrays, set-top boxes, DVD and blu-ray disc drivers.

• Undervoltage lockout, short-circuit limit
• Overload foldback current limit, controlled soft-start
• Thermal auto-retry, internal sensing FET
• Enable function, power MOSFET on-resistance is 40m ohm typ at (T = 25°C)
• Bias current is 50µA typ at (ON state, VEN = VIN = 5V, T = 25°C)
• Protection trip current is 5A typical at (T = 25°C)
• Output voltage ramp time is 0.6ms typ at (from VIN= VUVLO to VOUT = 90%, no CSS)
• Under voltage lockout is 3.6V typ at (VCP = VIN, turn-on, voltage going up)
• Operating temperature range from -40°C to 85°C
• 10-lead DFN package