STEF4S [ETC]
Electronic fuse for 3.3 V and 5 V lines;
| 型号： | STEF4S |
| 厂家： | 
ETC |
| 描述： | Electronic fuse for 3.3 V and 5 V lines |
| 文件： | 总21页 (文件大小：2293K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
STEF4S
Electronic fuse for 3.3 V and 5 V lines
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.
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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.
Features
• Power MOSFET on-resistance (typ.): 40 mΩ
• Enable function
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.
• Output clamp voltage (typ.): 5.7 V in 5 V mode,
and 3.8 V in 3.3 V mode
• Undervoltage lockout
Applications
• Short-circuit limit
• Hard disk drives
• Overload foldback current limit
• Controlled soft-start
• Solid state drives (SSD)
• Hard disk and SSD arrays
• Set-top boxes
• Thermal auto-retry
• Internal sensing FET
• DVD and blu-ray disc drivers
• Operative temp. range: - 40 °C to 85 °C
• Available in DFN 3x3 10L package
Table 1. Device summary
Order code
Package
Packing
Description
STEF4SPUR
DFN 3x3 10L
Tape and reel
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
October 2013
DocID025259 Rev 1
1/21
This is information on a product in full production.
www.st.com
21
Contents
STEF4S
Contents
1
2
3
4
5
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
Turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Normal operating condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output voltage clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thermal shutdown and auto-retry function . . . . . . . . . . . . . . . . . . . . . . . 9
5.2
5.3
5.4
Startup time and CSS calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
UVLO and voltage clamp selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
7
8
9
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
DocID025259 Rev 1
STEF4S
Block diagram
1
Block diagram
Figure 1. Device block diagram
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DocID025259 Rev 1
3/21
Pin configuration
STEF4S
2
Pin configuration
Figure 2. Pin configuration (top view)
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Table 2. Pin description
Note
Pin n°
Symbol
1, 2, 3
VIN
VCP
GND
Input supply voltage pin
4
5
Voltage clamping and UVLO selection pin (high state 5 V, low state 3.3 V)
Ground pin (can be left floating if TAB is connected to GND)
Soft-start time selection pin. A capacitor can be connected between this pin and GND to
increase the startup time
6
SST
7
EN
Enable pin (active high)
8,9,10
EXP
VOUT
GND
Output voltage pin
Exposed pad is internally connected to GND
4/21
DocID025259 Rev 1
STEF4S
Maximum ratings
3
Maximum ratings
Table 3. Absolute maximum ratings
Parameter
Positive power supply voltage
Symbol
Value
Unit
VIN
VOUT
VCP
EN
-0.3 to 15
-0.3 to 7
V
V
Output voltage
UVLO and voltage clamp selection pin
Enable pin
-0.3 to VIN
-0.3 to VIN
-0.3 to 4.6
-40 to 125
-65 to 150
260
V
V
SST
TJ
Soft-start time selection pin
Max. junction temperature(1)
Storage temperature range
Lead temperature (soldering) 10 s
V
°C
°C
°C
TSTG
TLEAD
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
Value
Unit
RthJA
RthJC
Thermal resistance junction-ambient
Thermal resistance junction-case
40
°C/W
°C/W
2.5
DocID025259 Rev 1
5/21
Electrical characteristics
STEF4S
4
Electrical characteristics
Unless otherwise specified, typical values are referred to VIN= 5 V for VCP = VIN and VIN
=
3.3 V for VCP = GND, T = 25 ºC, min. and max. values are referred to T= - 40 ºC to 85 ºC.
Table 5. STEF4S electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ. Max. Unit
VIN
Operating input voltage
10
V
Under/overvoltage protection, 3.3 V mode
VClamp
VUVLO
VHyst
Output clamping voltage
Under voltage lockout
UVLO hysteresis
VIN = 10 V, VCP = GND
3.6
2.2
50
3.8
2.3
90
4.0
2.4
V
V
VCP = GND,
Turn-on, voltage going up
VCP = GND
130
mV
Under/overvoltage protection, 5 V mode
VClamp
VUVLO
VHyst
Output clamping voltage
Under voltage lockout
UVLO hysteresis
VIN = 10 V, VCP = VIN
5.4
3.4
60
5.7
3.6
105
6.0
3.8
V
V
V
CP = VIN,
Turn-on, voltage going up
VCP = VIN
150
mV
Power MOSFET
ON-resistance
RDS(on) = (VIN-VOUT)/IOUT
Current limit
IOL Protection trip current
ILim
40
RDS(on)
mΩ
Tj = 85 °C(1)
70
9
5
7
3
A
A
A
Overload current limit
5
IShort
Short-circuit current limit
VOUT = 0 V
Soft-start circuit
From VIN= VUVLO to VOUT = 90 %,
no CSS
0.6
23
Tss
Output voltage ramp time
ms
From VIN = VUVLO to VOUT = 90 %,
CSS = 100 nF
16
30
Enable pin thresholds
VEN-L
VEN-H
CP pin thresholds
VCP-L 3.3 V mode selection threshold
VCP-H 5 V mode selection threshold
Enable pin switch-off voltage
Output disabled
Output enabled
0.4
V
V
Enable pin switch-on voltage
2
2
V
3.3 V mode enabled
5 V mode enabled
0.4
V
V
6/21
DocID025259 Rev 1
STEF4S
Electrical characteristics
Table 5. STEF4S electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ. Max. Unit
Total device
ON state, VEN = VIN = 5 V
50
15
65
IBias
Vmin
Bias current
µA
V
OFF state, VEN = GND, VIN = 5 V
Device is in OFF state (VOUT = 0)
Minimum operating voltage
2
Thermal latch
Shutdown temperature
Hysteresis
140
20
°C
TSD
1. Guaranteed by design, not tested in production.
DocID025259 Rev 1
7/21
Typical characteristics
STEF4S
5
Typical characteristics
Figure 3. Application circuit
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8/21
DocID025259 Rev 1
STEF4S
Typical characteristics
5.1
Operating modes
5.1.1
Turn-on
When the input voltage is applied and the EN pin is high, the output voltage is supplied with
a slope defined by the internal dv/dt circuitry. If no additional capacitor is connected to CSS
pin, the total time from the enable signal going high and the output voltage reaching the
nominal value is around 0.6 ms.
5.1.2
5.1.3
5.1.4
Normal operating condition
The STEF4S E-fuse behaves like a mechanical fuse, buffering the circuitry on its output with
the same voltage shown at its input, apart from a small voltage fall due to the MOSFET
RDS(on)
.
Output voltage clamp
The internal voltage clamp circuit clamps the output voltage to the VClamp values reported in
Table 5 if the input voltage exceeds the typical thresholds of 3.8 V in the 3.3 V mode and 5.7
V in the 5 V mode.
Current limiting
When an overload event occurs, the current limiting circuit reduces the conductivity of the
power MOSFET, in order to clamp the input current at the pre-programmed value. The
current limit circuit has a foldback characteristic to reduce the power dissipation over the
power MOSFET in short-circuit condition.
5.1.5
Thermal shutdown and auto-retry function
If the device temperature exceeds the thermal shutdown threshold, typically 140 °C, the
thermal shutdown circuitry turns the power MOSFET off and disconnects the load. Once the
die temperature has decreased about 20 °C the device automatically attempts to apply
again the power to the load (auto-retry). This cycle persists until the fault condition is
removed.
5.2
Startup time and C calculation
SS
Connecting a capacitor between the CSS pin and GND allows the modification of the output
voltage startup time.The startup time (Tss) is defined as the time interval between the device
UVLO threshold, which has been overcome, and VOUT , which has reached 90% of the
nominal value as shown in Figure 4.
The below Table 6 shows the typical startup time obtained with the industry-standard values
of CSS
.
Table 6. Startup time vs. Css capacitor value
Value
Parameter
Css [nF]
Tss [ms]
None
0.6
10
47
100
23
2.3
10.8
DocID025259 Rev 1
9/21
Typical characteristics
STEF4S
The capacitance to be added to CSS pin can be also estimated by using the following
theoretical formula:
Equation 1
CSS = 4.35 × 10–6 × Tss
The above value is not valid if CSS is not connected. CSS is expressed in Farad and the time
in seconds.
A ceramic low leakage capacitor is suggested for this purpose. The formula is meant as a
theoretical support to choose the CSS capacitor and it does not take into account the
capacitor tolerance, temperature and process variations.
Figure 4. Startup time
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5.3
UVLO and voltage clamp selection
The device can be used either on the 3.3 V or on the 5 V lines. The operating mode can be
selected through the VCP pin.
If this pin is set at high level (VCP > 2 V) the operating mode is 5 V. In this mode the UVLO
threshold is 3.6 V typical, the clamping voltage is set to 5.7 V.
If the VCP pin is pulled to low level (VCP < 0.4 V), the operating mode is 3.3 V. In this mode
the UVLO threshold is 2.3 V typical, the clamping voltage is set to 3.8 V.
5.4
Enable pin
The EN pin is used to turn on/off the device. The device is disabled when the EN pin voltage
is lower than 0.4 V, enabled if the EN pin voltage is higher than 2 V.
10/21
DocID025259 Rev 1
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)
Figure 6. RDS(on) vs temperature (5 V)
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Figure 7. Clamping voltage vs temperature
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Figure 8. Clamping voltage vs temperature (5 V)
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DocID025259 Rev 1
11/21
Typical performance characteristics
STEF4S
Figure 9. UVLO threshold vs temperature (3.3 V) Figure 10. UVLO threshold vs temperature (5 V)
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Figure 11. Bias current vs temperature (3.3 V)
Figure 12. Bias current vs temperature (5 V)
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Figure 13. Shutdown current vs temperature
(3.3 V)
Figure 14. Shutdown current vs temperature
(5 V)
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12/21
DocID025259 Rev 1
STEF4S
Typical performance characteristics
Figure 15. Trip point, overload and short-circuit Figure 16. Trip point, overload and short-circuit
current (3.3 V) current (5 V)
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Figure 17. Startup into short-circuit (3.3 V)
Figure 18. Startup into short-circuit (5 V)
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Figure 19. Soft-start behavior (3.3 V)
Figure 20. Soft-start behavior (5 V)
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DocID025259 Rev 1
13/21
Package mechanical data
STEF4S
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 7. DFN6 (3 x 3 mm) mechanical data
mm
Dim.
Min.
Typ.
Max.
A
A1
b
0.70
0.00
0.18
0.75
0.02
0.25
3.00
3.00
0.5
0.80
0.05
0.30
D
E
e
D2
E2
K
2.234
1.496
0.20
2.384
1.646
2.484
1.746
L
0.30
0.40
0.05
0.10
0.10
0.05
0.08
0.50
aaa
bbb
ccc
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eee
14/21
DocID025259 Rev 1
STEF4S
Package mechanical data
Figure 21. DFN6 (3 x 3 mm) drawings
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DocID025259 Rev 1
15/21
Package mechanical data
STEF4S
Figure 22. DFN6 footprint (dimensions in mm)
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16/21
DocID025259 Rev 1
STEF4S
Packaging mechanical data
8
Packaging mechanical data
Table 8. DFN6 tape and reel mechanical data
mm
Dim.
Min.
Typ.
Max.
A0
B0
K0
3.20
3.20
1
3.30
3.30
1.10
3.40
3.40
1.20
DocID025259 Rev 1
17/21
Packaging mechanical data
STEF4S
Figure 23. Tape for DFN6
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18/21
DocID025259 Rev 1
STEF4S
Packaging mechanical data
Figure 24. Reel for DFN6
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Figure 25. Schematic drawing orientation
DocID025259 Rev 1
19/21
Revision history
STEF4S
9
Revision history
Table 9. Document revision history
Changes
Date
Revision
23-Oct-2013
1
Initial release.
20/21
DocID025259 Rev 1
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