800 mA buck — input range and output floor
The MAX1927REUB+: The adjustable output goes down to 0.75 V, which suits low-voltage core rails for MCUs and FPGAs that have migrated below 1 V. The switching frequency spans 800 kHz to 1.2 MHz, letting the designer trade inductor size against switching losses. At 1.2 MHz the inductor can be as small as 2.2 µH, but the transition losses in the internal FETs rise — a 10-µH inductor at 800 kHz keeps efficiency higher at light loads.
Synchronous rectification and thermal envelope
Internal synchronous rectifier means no external Schottky catch diode — the low-side FET replaces it, boosting efficiency especially at low output voltages where a diode's forward drop would eat a large fraction of the output. The trade-off is a slightly higher quiescent current than a diode-based part at very light loads.
Active lifecycle and compliance posture
It is ROHS3 compliant (no exemptions), which clears EU and UKCA markets without a waiver.