What the 150 mA output and 165 mV dropout mean for your rail
The MAX8867EUK32+T is a 150 mA low-dropout linear regulator with a fixed 3.2 V output, housed in a SOT-23-5 package. The 63 dB PSRR at 10 kHz is the spec that matters for noise-sensitive analog supplies — it attenuates switching-regulator ripple by a factor of about 1400 at that frequency, which keeps the output clean enough for an ADC reference or an op-amp front-end.
Protection and operating range
Built-in protection covers overcurrent, overtemperature, reverse polarity, and short circuit — the regulator survives a sustained output short without damage and recovers when the fault clears. The input range goes up to 6.5 V, so it works from a 5 V rail or a lithium-ion battery (4.2 V full charge) with margin. The quiescent current is 180 µA typical, and the maximum supply current is 100 µA — low enough for battery-powered designs that spend most of their time in a light-load state.