The LM25574 is an easy to use buck regulator which allows design engineers to design and
optimize a robust power supply using a minimum set of components. Operating with an input voltage
range of 6 V to 42 V, the LM25574 delivers 0.5-A of continuous output current with an integrated
750-mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which
provides inherent line regulation, tight load transient response, and ease of loop compensation
without the usual limitation of low-duty cycles associated with current mode regulators. The
operating frequency is adjustable from 50 kHz to 1-MHz to allow optimization of size and
efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x
family to self-synchronize or to synchronize to an external clock. The LM25574 guarantees
robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and
remote shut-down. The device is available in a TSSOP-16 package. The LM25574 is supported by the
full suite of WEBENCH® On-Line design
tools.
