Nisshinbo Micro Devices R5541K001D-E2, 1Low Side, Low Side Power Control Switch 6-Pin, DFN(PL)1212-6F

The Nisshinbo Micro Devices Load Switch IC is an ideal switch for supplying the power from the secondary power source such as the output of a step down DC/DC converter to the load circuit. A built in Nch. transistor with typically 18 mΩ ON resistance allows it to provide a low dropout voltage and prevents the reverse current during shutdown mode. Internally, a single IC consists of an internal voltage step up circuit, a soft start circuit, a thermal shutdown circuit, a chip enable circuit and a UVLO circuit.

Single Nch MOSFET circuit
Soft start function
Thermal shutdown circuit