Providing the 5 V needed for the gate drive bias, Semtech’s SC417 point-of-load (POL) synchronous buck regulator uses an adjustable 150-mA LDO for operation from a single rail. The RoHS-compliant unit offers an input voltage range from 3 V to 28 V, internal crossover circuitry, pseudo fixed frequency adaptive on-time control, SmartDrive technology, and selectable ultrasonic power save. The 5 mm² QFN-packaged component utilizes 7/17-mO low- and high-side MOSFETS to enable efficiencies of >90% between 1 A and 10 A. The products exhibits built-in soft-start, cycle-by-cycle current limiting, overtemperature, overvoltage, and undervoltage protection. Pricing is $2.58 each in 1,000 quantities.