85mΩ power switch features adjustable current limit

9th May 2014
Nat Bowers

Enabling designers to set the current limit to a desired value by using an external resistor, the XC8108/9 series from Torex Semiconductor provides an adjustable current limit feature. The device incorporates an 85mΩ P-channel MOSFET power switch for low ON resistance and is optimised for USB, power line and Hot plug applications.

The over-current limiting feature has a high precision of ±10% and a high speed response time of 2µs. The current limit can be adjusted with an external resistor within the range of 0.9-2.0A(XC8108) and 0.075-1.3A (XC8109).

Protection circuits such as a current limiting, reverse current prevention, thermal shutdown, under-voltage lockout (UVLO) and soft start contribute to the safe operation of the application.

A flag function is provided to allow monitoring of the switch state. The flag pin is an N-channel open drain output which outputs a low level during detection of over-current or over-heating, or while the reverse current prevention function is operating.

The XC8108/9 is readily available in a small USP-6C package.

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