Enhanced-product 36V 3A synchronous step-down converter with 1.5µA IQ and low EMI

The LMR66430-EP is a small 36V, 3A, synchronous step-down DC/DC converter with an enhanced HotRod QFN package. This easy-to-use converter supports a wide input voltage range of 2.7V to 36V (after start-up or after operating) with transients up to 42V.

The LMR66430-EP is specifically designed to meet low standby power requirements for always-on, applications. Auto mode enables frequency foldback when operating at light loads, allowing high light load efficiency. A seamless transition between pulse width modulation (PWM) and pulse frequency modulation (PFM) modes along with very low MOSFET ON resistances makes sure there is exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are an excellent choice for an ultra-small design size with minimal output capacitance. The device minimizes input filter size by using dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod QFN package, and an optimized pinout. 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 short circuits between pins. The rich feature set of the LMR66430-EP is designed to simplify implementation for a wide range of industrial end equipment.