The LM5574-Q1 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 - 75 V,
the LM5574-Q1 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 500 kHz to allow optimization of size and efficiency. To reduce EMI, a
frequency synchronization pin allows multiple ICs from the LM(2)557x family to self-synchronize or
to synchronize to an external clock. The LM5574-Q1 ensures 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 LM5574-Q1 is supported by the full suite of
WEBENCH On-Line design tools.
