LMR436x0/LMR436x0-Q1 Synchronous Buck Regulator Texas Instruments LMR436x0/LMR436x0-Q1 Synchronous Buck Regulator is a small 36V, 2A and 1A synchronous step-down DC/DC converter in a 2mm × 2mm HotRod package. This easy-to-use converter supports a wide input voltage range of 3.0V to 36V with transients up to 42V.