75V, 0.5A Step-Down Switching Regulator

The LM5574-Q1 is an easy-to-use, buck

regulator that allows design engineers to design and optimize a robust power supply

using a minimum set of components. Operating with an input voltage range of 6V to

75V, the LM5574-Q1 delivers 0.5A of continuous output current with an integrated

750mΩ N-Channel MOSFET. The regulator uses 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 50kHz to

500kHz 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 makes sure of

robustness with cycle-by-cycle current limit, short-circuit protection, thermal

shutdown, and remote shutdown. The device is available in a 16-pin TSSOP package.

The LM5574-Q1 is supported by the full suite of WEBENCH online design tools.