The LMQ664x0 is designed to meet low standby power requirements for always-on industrial applications. The auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5µA at 13.5VIN and high light load efficiency. A seamless transition between PWM and PFM modes and very low MOSFET ON resistances ensures exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are optimized for an ultra-small solution size with minimal output capacitance. The device minimizes input filter size using a dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod™ QFN package, and an optimized pin-out. The MODE/SYNC and RT pin variants can be used to set or synchronize the frequency to avoid noise-sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (optimal pin FMEA). The rich feature set of the Texas Instruments LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.