2.7V to 18V input, 4A output eFuse in a 2x2 mm WSON
The Texas Instruments TPS259571DSGR is an electronic fuse (eFuse) that protects downstream circuitry from overcurrent, overvoltage, and inrush events. It operates from a 2.7V to 18V input rail and delivers up to 4A continuous output — covering common 3.3V, 5V, 12V, and 15V supply buses in industrial, automotive, and telecom equipment.
Current-limit accuracy and protection margin
The TPS259571DSGR specifies a current-limit accuracy of ±7.5%. This tolerance sets the headroom between the nominal load current and the programmed trip threshold — a ±7.5% band means the designer must budget for a minimum trip point 7.5% below the set value to avoid nuisance trips at full load. The 4A continuous output rating is the steady-state current the device can carry without exceeding the thermal limits of the 8-WSON package. Actual current capability depends on PCB copper area, airflow, and ambient temperature — the datasheet's thermal derating curves should be consulted for the specific layout.
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