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PDF STEF4S Data sheet ( Hoja de datos )
| Número de pieza | STEF4S | |
| Descripción | Electronic fuse | |
| Fabricantes | STMicroelectronics | |
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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
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www.st.com
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1 page  
STEF4S
3 Maximum ratings
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VIN Positive power supply voltage
-0.3 to 15
V
VOUT
Output voltage
-0.3 to 7
V
VCP UVLO and voltage clamp selection pin
-0.3 to VIN
V
EN Enable pin
-0.3 to VIN
V
SST Soft-start time selection pin
-0.3 to 4.6
V
TJ Max. junction temperature(1)
-40 to 125
°C
TSTG
Storage temperature range
-65 to 150
°C
TLEAD
Lead temperature (soldering) 10 s
260 °C
1. The thermal limit is set above the maximum thermal rating. It is not recommended the device to operate at temperatures
greater than the maximum ratings for extended periods of time.
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Thermal data
Symbol
Parameter
RthJA
RthJC
Thermal resistance junction-ambient
Thermal resistance junction-case
Value
40
2.5
Unit
°C/W
°C/W
DocID025259 Rev 1
5/21
5 Page 
STEF4S
Typical performance characteristics
6 Typical performance characteristics
(The following plots are referred to the typical application circuit and, unless otherwise
noted, at TA = 25 °C)
Figure 5. RDS(on) vs temperature (3.3 V)
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Figure 6. RDS(on) vs temperature (5 V)
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Figure 7. Clamping voltage vs temperature Figure 8. Clamping voltage vs temperature (5 V)
(3.3 V)
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DocID025259 Rev 1
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11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet STEF4S.PDF ] | |
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