The electronic part FP6166S5CTR is a low dropout (LDO) positive adjustable voltage regulator with a rating of 890mV @ 600mA. It operates on a 5.5V input voltage and provides an output voltage of 1V to 5.5V with a maximum current output of 600mA. It comes in a 5-pin SOT-23-5 form factor and is RoHS compliant, manufactured by Fitipower.