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STMicroelectronics Electronic Components Datasheet

STEF4S Datasheet

Electronic fuse

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STEF4S
Electronic fuse for 3.3 V and 5 V lines
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Features
Power MOSFET on-resistance (typ.): 40 mΩ
Enable function
Output clamp voltage (typ.): 5.7 V in 5 V mode,
and 3.8 V in 3.3 V mode
Undervoltage lockout
Short-circuit limit
Overload foldback current limit
Controlled soft-start
Thermal auto-retry
Internal sensing FET
Operative temp. range: - 40 °C to 85 °C
Available in DFN 3x3 10L package
Description
The STEF4S is an integrated electronic fuse
optimized for monitoring the output current and
the input voltage. It can be connected in series to
3.3 V or 5 V rails, protecting the electronic
circuitry on its output from overcurrent and
overvoltage. The operating mode (5 V or 3.3 V)
can be selected by a dedicated pin. The STEF4S
has a controlled turn-on time, adjustable by an
external capacitor. When an overload condition
occurs the device limits the output current to a
Datasheet - production data
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,
the E-fuse limits the output current to a safe
value.
In case of overvoltage on the input, the device
clamps the output voltage to a predefined value
and protects the load.
If the anomalous fault condition pe rsists, the
internal thermal protection circuit shuts down the
device and then automatically attempts to re-
supply the load until the fault condition is
removed.
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.
Applications
Hard disk drives
Solid state drives (SSD)
Hard disk and SSD arrays
Set-top boxes
DVD and blu-ray disc drivers
Table 1. Device summary
Order code
Package
Packing
STEF4SPUR DFN 3x3 10L Tape and reel
October 2013
This is information on a product in full production.
DocID025259 Rev 1
1/21
www.st.com
21


STMicroelectronics Electronic Components Datasheet

STEF4S Datasheet

Electronic fuse

No Preview Available !

Contents
Contents
STEF4S
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.1 Turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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 and auto-retry function . . . . . . . . . . . . . . . . . . . . . . . 9
5.2 Startup time and CSS calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 UVLO and voltage clamp selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 DocID025259 Rev 1


Part Number STEF4S
Description Electronic fuse
Maker STMicroelectronics
Total Page 21 Pages
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