High-Power Fuse Packs Value-Added Features

The STEF01 programmable electronic fuse from STMicroelectronics handles up to 4A continuous current over a wide operating input-voltage range of 8V to 48V, with low insertion loss thanks to a low-RDS(ON) VIPower MOSFET. When connected in series to the main power rail, the STEF01 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 the company’s BCD8 high-voltage process to integrate value-added 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. Programmable Under-Voltage Lockout (UVLO), also set using external components, allows the user to fine-tune the desired voltage-rail minimum value to suit the load requirements.

FREE SENSORS NEWSLETTER

Like this story? Subscribe to Sensors Online!

Sensors delivers a suite of newsletters, each serving as an information resource to help engineers and engineering professionals make efficient design and business decisions. Sign up to get news and updates delivered to your inbox and read on the go.

 

Other features include thermal shutdown with latching or auto-retry, maximum dissipated-power protection, a power-good indicator, and an enable/fault pin that can be used as either a status monitor or to control the device. A dedicated gate-driver output for controlling an external N-channel MOSFET simplifies implementation of reverse-current protection.

 

The STEF01 is available now in a 14-pin HTSSOP14 package, priced from $1 each/1,000 pieces. For further information, download the STEF01 datasheet.