LM25574

www.DataSheet4U.com LM25574 42V, 0.5A Step-Down Switching Regulator January 2007 LM25574 42V, 0.5A Step-Down Switching Regulator General Description The LM25574 is an easy to use SIMPLE SWITCHER® 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 - 42V, the LM25574 delivers 0.5A of continuous output current with an integrated 750mΩ 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 lowduty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 1MHz 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. Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Integrated 42V, 750mΩ N-channel MOSFET Ultra-wide input voltage range from 6V to 42V Adjustable output voltage as low as 1.225V 1.5% feedback reference accuracy Operating frequency adjustable between 50kHz and 1MHz with single res...