Maximum dropout is 300 mV at the full 100 mA load — that 300 mV headroom between input and output is the minimum you must budget across temperature and load.
PSRR and protection — bench-level considerations
PSRR is 55 dB at 120 Hz — that is the ripple rejection at the line-frequency fundamental, relevant when the input comes from a rectified AC or a switching pre-regulator. On-chip protection covers over-temperature, reverse polarity on the input, and output short-circuit, which reduces the need for external clamp diodes or supervisory ICs.
Package and footprint — DDPAK / TO-263-5
The device is supplied in the DDPAK/TO-263-5 surface-mount package (5 leads plus exposed tab), also referred to as TO-263-6, D²Pak.