Wide-input buck controller for 12V/24V industrial rails
The LTC3834IGN-1#PBF is a single-phase synchronous buck controller from Analog Devices, accepting a 4V to 36V supply range that covers standard 12V and 24V industrial buses without needing a pre-regulator. Its 99.4% maximum duty cycle means the output can ride within millivolts of the input rail — useful when the input sags close to the target output voltage, such as during a battery discharge event. The switching frequency is programmable from 250 kHz to 530 kHz, letting you trade inductor size against switching losses; a higher frequency shrinks the magnetics but increases FET gate-drive losses.
Synchronous rectification and control features for efficient sequencing
Built-in synchronous rectification eliminates the external Schottky catch diode, improving efficiency at higher output currents — the bottom FET conducts during the off-time instead of a diode. Control features include an enable pin for power-up sequencing, a soft-start pin to limit inrush current, and a tracking input that lets the output follow another rail during startup — useful in multi-voltage FPGA or processor designs. The output configuration is positive and the driver signal is a transistor driver, meaning it drives external N-channel MOSFETs in a standard buck arrangement.