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STEF033 Datasheet(PDF) 1 Page - STMicroelectronics |
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STEF033 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 25 page  This is information on a product in full production. January 2015 DocID025099 Rev 2 1/25 STEF033 Electronic fuse for 3.3 V line Datasheet - production data Features • Continuous current typ.: 3.6 A (DFN), 2.5 A (Flip Chip) • N-channel on resistance (typ): 40 mΩ (DFN), 25 m Ω (Flip Chip) • Enable/Fault functions • Output clamp voltage (typ): 4.5 V • Undervoltage lockout • Short-circuit limit • Overload current limit • Controlled output voltage ramp • Thermal latch (typ): 160 °C • Uses tiny capacitors • Latching and auto-retry versions • Operative junction temp. - 40 °C to 125 °C • Available in DFN10 3x3 and Flip Chip 9 bumps Applications • Hard disk drives • Solid state drives (SSD) • Hard disk and SSD arrays • Computer • DVD and Blu-Ray disc drivers Description The STEF033 is an integrated electronic fuse optimized for monitoring output current and the input voltage. Connected in series to the 3.3 V rail, it is able to protect the electronic circuitry on its output from overcurrent and overvoltage. The STEF033 has controlled delay and turn-on time. When an overload condition occurs, the device limits the output current to a 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, when the power is re-applied the E-fuse initially limits the output current to a safe value and then goes again into the open state. The voltage clamping circuit prevents the output voltage from exceeding a fixed value, if the input voltage goes beyond this threshold. The device is equipped with a thermal protection circuit. Intervention of thermal protection is signaled to the board-monitoring circuits through an appropriate 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 performances following short-circuit/thermal protection intervention and is reset either by re-cycling the supply voltage or using the appropriate Enable pin. The STEF033 is also available in an auto- retry version; in case of thermal fault it automatically attempts to re-apply power to the load when the die temperature returns to a safe value. DFN10 (3 x 3 mm) Flip Chip 9 www.st.com |
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