STEF05LJR STMicroelectronics

STEF05L Electronic fuse for 5 V line Features Continuous current typ.: 3.6 A (DFN), 2.5 A (Flip Chip) N-channel on resistance (typ): 40 m (DFN), 25 m (Flip Chip) Enable/Fault functions Output clamp voltage (typ.): 6.1 V Undervoltage lockout Short-circuit limit Overload current limit Controlled output voltage ramp Thermal latch (typ): 160 C Uses tiny capacitors Latching and auto-retry versions Operative junction temp. - 40 C to 125 C Available in DFN10 (3 x 3 mm) and Flip Chip 9 bumps Applications Hard disk drives Solid state drives (SSD) Hard disk and SSD arrays Computer DVD and Blu-Ray disc drivers Maturity status link STEF05L Description The STEF05L is an integrated electronic fuse optimized for monitoring output current and the input voltage. Connected in series to the 5 V rail, it is able to protect the electronic circuitry on its output from overcurrent and overvoltage. The STEF05L has controlled delay and turn-on time. 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, when the power is re-applied the eFuse initially limits the output current to a safe value and then goes again into the open state. The voltage clamping circuit prevents the output voltage from exceeding a fixed value, if the input voltage goes beyond this threshold. The device is equipped with a thermal protection circuit. Intervention of thermal protection is signaled to the board-monitoring circuits through an appropriate signal on the Fault pin. Unlike mechanical fuses, which must be physically replaced after a single event, the eFuse does not degrade in its performances following short-circuit/thermal protection intervention and is reset either by re-cycling the supply voltage or using the appropriate Enable pin. The STEF05L is also available in an autoretry version in case of thermal fault it automatically attempts to re-apply power to the load when the die temperature returns to a safe value. DS11527 - Rev 2 - December 2020 www.st.com For further information contact your local STMicroelectronics sales office.STEF05L Device block diagram 1 Device block diagram Figure 1. Block diagram DS11527 - Rev 2 page 2/25