3V rail for noise-sensitive loads
The ROHM BU30TA2WNVX-TR is a fixed 3V output LDO regulator rated for 200mA continuous output. The 4-UDFN exposed-pad package (SSON004X1216) keeps the footprint small — roughly 1.2 mm × 1.6 mm — which matters when board area is tight.
Dropout headroom and the 0.66V max
Dropout is specified at 0.66V maximum when delivering 200mA. That means a 3.6V input rail still holds the 3V output in regulation through a mild sag — useful in battery-powered gear where the cell voltage droops under load. If the input drops below 3.66V, the output starts to track the input minus dropout, so budget at least 0.7V of margin in the rail design.
PSRR at 1 kHz — what 65 dB buys you
With 65 dB of power-supply rejection at 1 kHz, this LDO attenuates ripple from a switching pre-regulator by roughly a factor of 1800 at that frequency. For an audio-codec supply or a precision ADC reference, that keeps the switching noise out of the signal band. The rejection rolls off above a few hundred kHz, so a small ceramic bypass at the input helps with higher-frequency hash.
Enable pin and protection
The enable pin lets a GPIO or power-management sequencer turn the output on and off without a separate load switch. Over-current and over-temperature protection are built in — the part folds back or shuts down rather than letting the junction run away. Quiescent current sits at 95 µA typical, which is moderate for a 200 mA LDO; not the lowest-Iq option for always-on wearables, but fine for peripherals that are gated by the enable pin.
Sourcing and lifecycle
ROHM lists the BU30TA2WNVX-TR as Active. The part is ROHS3 compliant.