STEF12 STMicroelectronics, STEF12 Datasheet
STEF12
Specifications of STEF12
Available stocks
Related parts for STEF12
STEF12 Summary of contents
Page 1
... Set-top boxes ■ DVD and Blu-ray disc drivers Description The STEF12 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 019056 Rev 4 STEF12 ...
Page 3
... STEF12 1 Device block diagram Figure 1. STEF12 block diagram AM09891v1 Doc ID 019056 Rev 4 Device block diagram 3/20 ...
Page 4
... Not connected Connected to the source of the internal power MOSFET and to the output terminal of the /Source OUT fuse 11 V Exposed pad. Positive input voltage must be connected 4/20 GND dv/ I-Limit N/C AM09880v1 Doc ID 019056 Rev 4 Source Source Source Source Source Note . CC STEF12 ...
Page 5
... STEF12 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Positive power supply voltage (steady state Positive power supply voltage (max 100ms) V /source (max 100ms) OUT I-Limit (max 100ms) 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 Table 6. Electrical characteristics for STEF12 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 D Current limit ...
Page 7
... STEF12 Table 6. Electrical characteristics for STEF12 (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 (1) Doc ID 019056 Rev 4 Electrical characteristics Min. ...
Page 8
... After an initial delay time of typically 350 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 019056 Rev 4 STEF12 AM09869v1 ...
Page 9
... STEF12 5.1.2 Normal operating condition The STEF12 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 the input voltage exceeds this threshold ...
Page 10
... OUT delay ramp-up time time Time threshold and then releasing it. il Doc ID 019056 Rev 4 STEF12 slope ( Figure OUT × dvdt AM09882v1 En/Fault VOUT Figure 6 ). This signal can ...
Page 11
... STEF12 Figure 6. Enable/Fault pin status Normal operating condition Thermal fault condition Off/Reset time Doc ID 019056 Rev 4 Typical application AM09871v1 11/20 ...
Page 12
... V = from LIMIT -40 - Temperature ° infinite - Temperature ° Ω LIMIT LOAD -40 - Temperature °C STEF12 AM09884v1 125 150 AM09886v1 125 150 AM09888v1 85 125 ...
Page 13
... STEF12 Figure 13. Current limit vs 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0. External Sensing Resistor (Ω) Figure 15. V ramp-up vs. Enable OUT µ µ OUT 25°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 14/20 Figure 20. Startup into output short-circuit (fast rise Ω LIMIT Doc ID 019056 Rev 4 STEF12 = Connected to GND OUT ...
Page 15
... STEF12 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 019056 Rev 4 STEF12 7426335_G ...
Page 17
... STEF12 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 019056 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 019056 Rev 4 STEF12 ...
Page 19
... STEF12 8 Revision history Table 8. Document revision history Date Revision 15-Jul-2011 1 08-Aug-2011 2 14-Dec-2011 3 06-Mar-2012 4 Initial release. Modified definition for T in Table 3: Absolute maximum ratings op Removed V and I rows from dv/dt circuit dv/dt dv/dt Updated: package mechanical data Figure 22 on page 18 and . Doc ID 019056 Rev 4 Revision history Changes ...
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 019056 Rev 4 STEF12 ...