LM25149/LM25149-Q1 Buck DC/DC Controller Texas Instruments LM25149/LM25149-Q1 Synchronous Buck DC/DC Controller is a 42V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25149/LM25149-Q1 can be set up in interleaved mode with accurate current sharing for high-current applications. It can operate with VIN as low as 3.5V, at nearly 100% duty cycle if needed.