Load switch safeguards USB ports
The AP22802 single channel load switch from Diodes Incorporated ensures complete protection for interconnects subject to the risk of surges and short circuits. Optimised for regular USB and other hot-swap applications, this highly integrated device is provided in the small form factor SOT25 package, offering a footprint of only 9mm2.
Operating over an input voltage range from 2.7V to 5.5V, the AP22802 sets a typical current limit of 2.7A to guard against overloads. Response time is fast, the device immediately clamping output current to a safe level on fault sensing. For added flexibility, the load switch offers circuit designers the choice of either active low and active high enable inputs.
The device’s under voltage lockout function ensures that the internal power switch remains off until input power level has reached a minimum of 2V, even if the switch is enabled; a useful facility in the design of single channel hot-insert systems.
To safely handle residual output voltage when the switch is disabled the AP22802’s automatic discharge function and internal N-MOS power switch combine to provide a dependable resistive discharge path.
Other protection features of the load switch include over-temperature detection with auto-recovery, reverse current blocking and controlled rise time. An open drain flag output is also included, with an in-built 6ms deglitch to prevent false reporting of over current and over temperature conditions.
The AP22802 single channel load switch pricing is $0.06USD each for a 1k piece quantity.
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