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.