Wide-input buck-boost controller for demanding rails
The Analog Devices LT8705IFE#PBF is a step-up/step-down (buck-boost) DC/DC switching controller designed to regulate an output voltage whether the input is above, below, or equal to the output. Its 2.8V to 80V supply range makes it a natural fit for automotive battery-stabilized rails, industrial 24V and 48V buses, and battery-powered systems that must hold regulation through deep discharge and overvoltage transients. The controller uses synchronous rectification for high efficiency and drives external N-channel MOSFETs in a 2-phase configuration, which spreads the thermal load and reduces input/output ripple. Switching frequency is programmable from 100kHz to 400kHz, with clock sync available to place switching noise outside a sensitive band.
What the 2.8V to 80V supply range means for the BOM
The 2.8V to 80V supply range covers automotive cold-crank and load dump without an external linear regulator.
Lifecycle and compliance: active and RoHS3
It is ROHS3 compliant, meaning no restricted substances above the threshold limits and no time-limited exemptions — it ships clean for global markets. The control features include enable, frequency control, and soft start, giving the designer a standard set of sequencing and startup management hooks.