The LTC3649 is an efficient 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistance programmable output voltage, internal compensation and high efficiency over a wide VOUT range. The step-down regulator has an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output range from (VIN-0.5V) to ground with an output current of up to 4A.
Typical application
Switching frequency is also regulated by external resistance. A user selectable mode input is provided to allow users to trade ripple noise under light load. Burst mode operation provides maximum efficiency under light load, 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 features a peak current mode architecture that allows for fast transient response with inherent period-to-cycle term current protection. It also has programmable output current limiting, current monitoring and input voltage regulation functions.
Function diagram
