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.

DFN10 (3x3 mm)

Maturity status link

STEF12E

Device summary

Order code

STEF12EPUR

Package

DFN10 (3x3 mm)

Packing

Tape and reel

Electronic fuse for 12 V line

STEF12E

Datasheet

DS12800 - Rev 2 - June 2022

For further information contact your local STMicroelectronics sales office.

www.st.com