Power by Linear™/Analog Devices’ LTC3649 is a high-efficiency 60 V, 4 A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage, internal compensation, and high-efficiencies over a wide V_OUT range.

The step-down regulator operates from an input voltage range of 3.1 V to 60 V and provides an adjustable rail-to-rail output range from (V_IN - 0.5 V) to ground while delivering up to 4 A of output current. The switching frequency is also adjusted with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode® operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to allow the user to synchronize the switching frequency to an external clock.

The LTC3649 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. It also features programmable output current limit, current monitoring, and input voltage regulation. This regulator comes in a QFN and TSSOP packages. The LTC3649 is ideal for industrial and automotive applications.