What the 60 dB PSRR at 100 Hz means for a noise-sensitive rail
The MAX8530ETTP2 is a dual-output LDO that delivers a fixed 2.5 V rail at 200 mA and a fixed 1.8 V rail at 150 mA. The 60 dB PSRR at 100 Hz means it attenuates 100 Hz ripple — the fundamental of a full-wave rectified mains supply — by a factor of 1000. If the input has 100 mV of 100 Hz ripple, the output sees about 100 µV. That is clean enough to feed an analog front-end or a PLL supply without an additional LC filter.
Dropout headroom and quiescent draw — the real BOM numbers
Maximum dropout is 200 mV at 100 mA per channel. If the input rail is 2.7 V, the 2.5 V output stays in regulation down to 100 mA load. Below that, headroom improves. The 220 µA quiescent current is the sum of both channels — not per regulator — so in a battery-backed always-on rail the LDO's own draw is under a quarter milliamp. That matters when the system spends most of its life in a low-power state and wakes to supply an ADC or a wireless transceiver.
Protection set and temperature grade — field-service perspective
Over-current, over-temperature, and short-circuit protection are on-die. No external supervisor or reset IC is needed for the output rails — the Enable and Reset control pins let a host processor sequence the outputs or hold them off during power-up.