The A6303D series are highly precise, low noise positive voltage LDO regulators manufactured using CMOS processes. The A6303D achieves high ripple rejection and low dropout and consists of a voltage reference, an error amplifier, a current limiter and a phase compensation circuit plus a driver transistor. The A603D is also compatible with low ESR ceramic capacitors which give added output stability. https://www.campuscomponent.com/products/ait-semiconductor-a6303de5r-33-cmos-low-dropout-voltage-regulator-ldo-ic-1601-/2208614000003253687