Sustaining up to 4 A continuous current over a wide operating input voltage range of 8 V to 48 V, with low insertion loss thanks to its integrated low-RDS(ON) VIPower MOSFET, the STEF01 programmable electronic fuse from STMicroelectronics extends the benefits of fast-acting overload protection to applications at higher power ratings.
When connected in series to the main power rail, the device protects the load against over-current and over-voltage. The voltage is clamped to a user-defined maximum, preset with external resistors. Excessive current is restricted to the programmed safe limit by controlling the internal power MOSFET, and folds back to a lower limit if a strong over-current or short circuit is detected.
The STEF01 leverages ST’s BCD8 high-voltage process to integrate features including dV/dt control to prevent excessive inrush current during startup or hot-swap insertion. This slows the output voltage ramp-up time to at least 3 ms, which can be increased if desired by connecting an external capacitor.
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