PSRR and noise-sensitive rail fit
The MIC5305-2.5YD5-TR delivers 85 dB of PSRR at 1 kHz, rolling off to 65 dB at 10 kHz — this is the spec that decides whether it cleans up a switching-regulator ripple or lets it through. For an RF or analog front-end rail, the 85 dB at 1 kHz means the LDO attenuates a 100 mVpp ripple at that frequency down to roughly 5.6 µVpp at the output, which is well below the noise floor of a 12-bit ADC or a BLE radio's supply rejection. The 150 mA output at a fixed 2.5 V suits it for powering a low-noise sensor bias, a small FPGA core, or a wireless SoC's analog supply — not a heavy digital rail, but enough for a precision load that cannot tolerate ripple.
Quiescent current and standby budget
At 150 µA quiescent current, the regulator's own draw is about 0.1% of the full load — acceptable for a battery-powered device that spends most of its time in a low-power sleep state, but not the ultra-low-Iq class (sub-1 µA) used for always-on wake circuits. For a sensor node that sleeps at 10 µA system current, the LDO's 150 µA dominates the sleep budget; a load-switch or a lower-Iq LDO would be needed ahead of it. The enable pin lets a microcontroller or a power-management sequencer shut the regulator down entirely, dropping the quiescent current to near zero in standby — a common pattern for gating the analog rail only when the measurement is active.
Temperature range and deployment context
The 125°C ceiling gives margin above the AEC-Q100 Grade 1 ambient limit of 125°C, though this part carries no explicit AEC-Q qualification in the record. The TSOT-23-5 package (1.6 mm × 2.9 mm typical) is a low-profile, small-footprint option for dense PCBs where board area is at a premium. The thin SOT-23 variant shaves about 0.2 mm off the seated height compared to a standard SOT-23, which matters in a stacked-board assembly or a handheld enclosure.
Protection and compliance
Built-in over-current and over-temperature protection means the regulator folds back or shuts down before it damages itself or the load — a standard feature for this class, but one that saves a board spin if the output is accidentally shorted during bench testing.