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Features

? Continuous current typ. 3.6 A

? N-channel on-resistance typ. 45 mΩ

? Enable/fault functions

? Output clamp voltage typ. 15 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 (3x3 mm) package

? UL2367 Recognized - File N. E468771

Applications

? Hard disk drives

? Solid state drives (SSD)

? Hard disk and SSD arrays

? Set-top boxes

? DVD and Blu-ray disc drivers

Description

The STEF12E is an integrated electronic fuse optimized for monitoring output current

and input voltage. Connected in series to a 12 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

STEF12E 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 board monitoring

circuits through a signal on the Fault pin. Unlike the mechanical fuses, which must

be physically replaced after a single event, the Efuse 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 the 5

V power rails is also available with part number STEF05.