75V, 0.5A Step-Down Switching Regulator

The LM5574 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 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 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 is supported by the full suite of

WEBENCH online design tools.