The MP5021 is a hot-swap protection device designed to protect circuitry on its output from transients on its input. It also protects its input from undesired shorts and transients coming from its output. At start up, the slew rate at the output limits the in-rush current. An external capacitor at the SS pin controls the slew rate. The maximum output load is current limited using a sense FET topology whereby a low-power resistor from the ISET pin to ground controls the magnitude of the current limit. An internal charge pump drives the gate of the power device, allowing for a power FET with a very low ON resistance of 7mΩ. The MP5021 includes an IMON option to produce a voltage proportional to the current through the power device, as set by a resistor from the IMON pin to ground. The MP5021 includes an optional discharge function that provides a discharge path for the external output capacitor when the part is disabled. Fault protections include current-limit protection, thermal shutdown, and damaged-MOSFET detection. Both the current limit and thermal shutdown have user-settable auto-retry and latch-off mode. The device also features over-voltage protection and under-voltage protection. The MP5021 is available in a 3mm×5mm QFN package.
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