STEF05 STMicroelectronics, STEF05 Datasheet

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STEF05

Manufacturer Part Number
STEF05
Description
Electronic fuse for 5 V line
Manufacturer
STMicroelectronics
Datasheet

Specifications of STEF05

Continuous Current (typ)
3.6 A
N-channel On-resistance (typ)
40 mΩ
Output Clamp Voltage (typ)
6.65 V
Thermal Latch (typ)
165 °C

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Features
Applications
Description
The STEF05 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 STEF05
limits the output current to a predefined safe
value. If the anomalous overload condition
Table 1.
March 2012
This is information on a product in full production.
Continuous current (typ): 3.6 A
N-channel on-resistance (typ): 40 mΩ
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 (3x3 mm) package
Hard disk drives
Solid state drives (SSD)
Hard disk and SSD arrays
Set-top boxes
DVD and Blu-ray disc drivers
STEF05PUR
Order code
Device summary
Doc ID 019055 Rev 4
DFN10 (3x3 mm)
Package
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 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.
Electronic fuse for 5 V line
DFN10 (3x3 mm)
Datasheet
Tape and reel
Packaging
STEF05
production data
www.st.com
1/20
20

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STEF05 Summary of contents

Page 1

... Set-top boxes ■ DVD and Blu-ray disc drivers Description The STEF05 is an integrated electronic fuse optimized for monitoring output current and input voltage. Connected in series rail capable of protecting the electronic circuitry on its output from overcurrent and overvoltage. The device has a controlled delay and turn-on time ...

Page 2

... Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.2 R limit calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.3 C calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 dv/dt 5.4 Enable/Fault pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 Turn- Normal operating condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output voltage clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Doc ID 019055 Rev 4 STEF05 ...

Page 3

... STEF05 1 Device block diagram Figure 1. STEF05 block diagram AM09891v1 Doc ID 019055 Rev 4 Device block diagram 3/20 ...

Page 4

... An external capacitor can be 9 dv/dt added to this pin to increase the ramp time additional capacitor is not required, this pin should be left open. 10 GND Ground pin 11 V Exposed pad. Positive input voltage must be connected 4/20 GND dv/dt V En/fault CC I-Limit N/C AM09867v1 Note Doc ID 019055 Rev 4 STEF05 . CC ...

Page 5

... STEF05 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Positive power supply voltage (steady state Positive power supply voltage (max 100 ms) V /source (max 100 ms) OUT I-Limit (max 100 ms) En/Fault dv/dt T Operating junction temperature range op T Storage temperature range STG T Lead temperature (soldering) 10 sec LEAD 1 ...

Page 6

... Electrical characteristics 4 Electrical characteristics 3 Table 6. Electrical characteristics for the STEF05 Symbol Parameter Under/overvoltage protection V Output clamping voltage Clamp V Undervoltage lockout UVLO V UVLO hysteresis Hyst Power MOSFET t Delay time dly R On-resistance DSon V Off state output voltage OFF I Continuous current ...

Page 7

... STEF05 Table 6. Electrical characteristics for the STEF05 (continued) Symbol Parameter V Minimum operating voltage min Thermal latch TSD Shutdown temperature 1. Pulse test: Pulse width = 300 µs, duty cycle = 2% 2. Guaranteed by design, but not tested in production Test conditions (2) Doc ID 019055 Rev 4 Electrical characteristics Min ...

Page 8

... After an initial delay time of typically 500 µs, the output voltage is supplied with a slope defined by the internal dv/dt circuitry additional capacitor is connected to dv/dt pin, the total time from the Enable signal going high and the output voltage reaching the nominal value is around 1 ms (refer to 8/20 Figure Doc ID 019055 Rev 4 STEF05 AM09868v1 AM09869v1 ...

Page 9

... STEF05 5.1.2 Normal operating condition The STEF05 E-fuse behaves like a mechanical fuse, buffering the circuitry on its output with the same voltage shown at its input, with a small voltage fall due to the N-channel MOSFET R . DSOn 5.1.3 Output voltage clamp This internal protection circuit clamps the output voltage to a maximum safe value, typically 6 ...

Page 10

... OUT delay ramp-up time time Time threshold and then releasing it. il Doc ID 019055 Rev 4 STEF05 slope (Figure 5 ). OUT × dvdt AM09870v1 VOUT EN/Fault Figure 6 ). This signal can ...

Page 11

... STEF05 Figure 6. Enable/Fault pin status Normal operating condition Thermal fault condition Off/Reset time Doc ID 019055 Rev 4 Typical application AM09871v1 11/20 ...

Page 12

... Doc ID 019055 Rev 4 UVLO voltage vs. temperature - 125 Temperature ° infinite - 125 Temperature ° Ω LIMIT LOAD - 125 Temperature °C STEF05 AM09873v1 150 AM09875v1 150 AM09877v1 150 ...

Page 13

... STEF05 Figure 13. Current limit vs ° 5.00 4.00 3.00 2.00 1.00 0. External Sense Resistor (Ω ) Figure 15. V ramp-up vs. Enable OUT µ 100 µ OUT C dv/dt Figure 17. Line transient = 22 Ω from LIMIT 100 µs Figure 14. Thermal latch delay vs. power ...

Page 14

... Typical performance characteristics Figure 19. Thermal latch from 2 A load to short-circuit = 22 Ω LIMIT 14/20 Figure 20. Startup into output short-circuit (fast rise Ω LIMIT Doc ID 019055 Rev 4 STEF05 = Connected to GND OUT ...

Page 15

... STEF05 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: ® ECOPACK trademark. Table 7. DFN10L (3x3 mm.) mechanical data Dim ...

Page 16

... Package mechanical data Figure 21. DFN10L package outline 16/20 Doc ID 019055 Rev 4 STEF05 7426335_G ...

Page 17

... STEF05 Tape & reel QFNxx/DFNxx (3x3) mechanical data Dim. Min 12 mm. Typ. Max. Min. 180 13.2 0.504 0.795 2.362 14.4 3.3 3.3 1 Doc ID 019055 Rev 4 Package mechanical data inch. Typ. Max. 7.087 0.519 0.567 0.130 0.130 0.043 0.157 0.315 ...

Page 18

... Package mechanical data Figure 22. DFN10L footprint - recommended data (dimensions in mm.) 18/20 7426335_G Doc ID 019055 Rev 4 STEF05 ...

Page 19

... STEF05 8 Revision history Table 8. Document revision history Date 15-Jul-2011 08-Aug-2011 15-Dec-2011 06-Mar-2012 Revision 1 Initial release. 2 Modified definition for T 3 Removed V and I dv/dt Updated: package mechanical data 4 on page 16 Figure 22 on page 18 and Doc ID 019055 Rev 4 Revision history Changes in Table 3: Absolute maximum ratings ...

Page 20

... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 20/20 Please Read Carefully: © 2012 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 019055 Rev 4 STEF05 ...

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