Dual LDO with independent 150 mA and 300 mA rails
The Micrel MIC2211-PMBML integrates two low-dropout regulators in a single 10-MLF package, delivering a fixed 3.0 V output at 150 mA and a fixed 2.8 V output at 300 mA. This dual-rail configuration suits designs that need separate analog and digital supply voltages from a single input up to 5.5 V. Each regulator includes its own enable control and independent protection against over-current and over-temperature events, allowing the system to sequence the rails or shut down one domain without affecting the other.
PSRR and noise rejection across frequency
Power supply rejection ratio is specified at 60 dB at 1 kHz, rolling off to 40 dB at 20 kHz. This profile is adequate for cleaning up switching-regulator ripple in the audio band, but the droop above 10 kHz means the LDO alone may not suppress high-frequency noise from a DC-DC converter switching at several hundred kilohertz — additional post-filter capacitance or a ferrite bead may be needed on sensitive analog rails.
Dropout voltage and quiescent current
Maximum dropout is 0.25 V at the 150 mA output and 0.42 V at the 300 mA output, so the input rail needs at least 3.25 V to maintain regulation on the 3.0 V channel under full load. Quiescent current is 80 µA typical — low enough for battery-operated equipment but not the ultra-low-Iq tier found in always-on wearables.
No official second-source cross-reference is listed, so dual-sourcing this BOM line would require qualifying a functionally equivalent dual LDO from another vendor with matching output voltages and package footprint.