3.3V fixed LDO with 72dB PSRR at 1kHz
The MAX8511EXK33-T: Its 90µA quiescent current suits battery-powered or always-on loads where standby draw matters. Power-supply rejection ratio (PSRR) is 72dB at 1kHz, rolling off to 46dB at 100kHz — enough to clean up ripple from a switching preregulator feeding sensitive analog circuitry.
Dropout and protection at operating temperature
Maximum dropout voltage is 0.12V at the full 120mA load, typical — the headroom between input and 3.3V output must stay above this across the load range to maintain regulation. On-chip protection includes over-current and over-temperature shutdown, covering the output against sustained shorts or thermal runaway. The shutdown control feature lets a system microcontroller gate the output for sequenced power-up.
SC-70-5 package and board-fit
Housed in a 5-lead SC-70-5 (SOT-353) package — 2.0mm × 2.1mm footprint with 0.65mm pin pitch. The small body suits space-constrained layouts on multi-layer PCBs where the decoupling caps sit close to the input and output pins. Surface-mount assembly with standard reflow profiles; no exposed thermal pad, so the junction-to-ambient thermal resistance relies on the copper plane area under the package.