The NCV51411 is a 1.5 A buck regulator IC operating at a fixed-frequency of 260 kHz. The device uses the V2t control architecture to provide unmatched transient response, the best overall regulation and the simplest loop compensation for today's high-speed logic. The NCV51411 accommodates input voltages from 4.5 V to 40 V and contains synchronization circuitry. The on-chip NPN transistor is capable of providing a minimum of 1.5 A of output current, and is biased by an external "boost" capacitor to ensure saturation, thus minimizing on-chip power dissipation. Protection circuitry includes thermal shutdown, cycle-by-cycle current limiting and frequency foldback. The NCV51411 is functionally pin-compatible with the LT1375.