Synchronous buck controller for 4V to 38V rails
The LTC3867EUF#PBF is a single-phase synchronous step-down DC/DC controller from Analog Devices, designed to drive external N-channel MOSFETs. It accepts a 4V to 38V supply and delivers a regulated positive output via a transistor driver. Control features include current limit, enable, frequency control, power-good flag, soft start, and tracking — enough for sequenced power-up in multi-rail systems. The 24-QFN (4x4 mm) package with exposed pad handles the thermal load.
What the switching frequency range means for the BOM
A 200kHz to 1.2MHz programmable range gives the designer a real choice: run at the low end for best efficiency and wider inductor saturation margin, or push toward 1.2MHz to shrink the inductor footprint and reduce output capacitor count. The 98% maximum duty cycle supports high step-down ratios without dropout issues.
ROHS3 compliant. No LTB risk on the horizon.