42V, 3A Step-Down Switching Regulator

The LM25576-Q1 is an easy-to-use buck

regulator which allows users to design and optimize a robust power supply using a

minimum set of components. Operating with an input voltage range of 6V to 42V, the

LM25576-Q1 delivers 3A of continuous output current with an integrated 170mΩ

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 1MHz 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 LM25576-Q1 establishes robustness with a cycle-by-cycle

current limit, short-circuit protection, thermal shut-down, and remote shut-down.

The device is available in a power enhanced HTSSOP-20 package featuring an exposed

die attach pad for thermal dissipation. The LM25576-Q1 is supported by the full

suite of WEBENCH On-Line design tools.