STEF05D Datasheet, PDF (1/19 Pages) STMicroelectronics – Electronic fuse for 5 V line

STEF05D
Electronic fuse for 5 V line
Datasheet - preliminary data
 Hard disk and SSD arrays
 Set-top boxes
 DVD and Blu-ray disc drivers
DFN10 (3 x 3 mm)
Features
 Continuous current typ: 3.6 A
 N-channel on-resistance typ: 40 m
 Enable/fault functions
 Output clamp voltage typ: 6.65 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 (3 x 3 mm).
Applications
 Hard disk drives
 Solid state drives (SSD)
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
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
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 signal led to the board monitoring circuits
through a signal on the Fault pin.
Unlike mechanical fuses, which must be
physically replaced after a single event, the E-
fuse 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 12 V power rails is also
available with part number STEF12.
Table 1. Device summary
Order code
STEF05DPUR
Package
DFN10 (3 x 3 mm)
Packaging
Tape and reel
March 2013
DocID024394 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/19
www.st.com
19