STEF05DPUR STMicroelectronics

STEF05D Electronic fuse for 5 V line Datasheet - production data Hard disk and SSD arrays Set-top boxes DVD and Blu-ray disc drivers Description 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 DFN10 (3 x 3 mm) 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 Features the load from the power supply. If a continuous Continuous current typ: 3.6 A short-circuit is present on the board, when power is re-applied the E-fuse initially limits the output N-channel on-resistance typ: 40 m current to a safe value, and then again goes into Enable/fault functions an open state. Output clamp voltage typ: 6.65 V The device is equipped with a thermal protection Undervoltage lockout circuit. The intervention of the thermal protection Short-circuit limit is signal led to the board monitoring circuits through a signal on the Fault pin. Overload current limit Unlike mechanical fuses, which must be Controlled output voltage ramp physically replaced after a single event, the E- Thermal latch typ: 165 C fuse does not degrade in its performance after Uses tiny capacitors short-circuit/thermal protection interventions and it is reset either by recycling the supply voltage or Operating junction temp. - 40 C to 125 C using the Enable pin. Available in DFN10 (3 x 3 mm). The companion chip for 12 V power rails is also available with part number STEF12. Applications Hard disk drives Solid state drives (SSD) Table 1. Device summary Order code Package Packaging STEF05DPUR DFN10 (3 x 3 mm) Tape and reel May 2020 DocID024394 Rev 2 1/19 This is information on a product in full production. www.st.com 19Contents STEF05D Contents 1 Block diagram 3 2 Pin configuration 4 3 Maximum ratings 5 4 Electrical characteristics . 6 5 Typical application 8 5.1 Operating modes 8 5.1.1 Turn-on 8 5.1.2 Normal operating condition . 9 5.1.3 Output voltage clamp 9 5.1.4 Current limiting . 9 5.1.5 Thermal shutdown 9 5.2 R calculation . 9 Limit 5.3 C calculation . 9 dv/dt 5.4 Enable/fault pin 10 6 Typical performance characteristics . 12 7 Package mechanical data 14 8 Revision history . 18 2/19 DocID024394 Rev 2