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1 Features

1? Integrated 42-V, 330-mΩ N-Channel MOSFET

? Ultra-Wide Input Voltage Range From 6 V to 42 V

? Adjustable Output Voltage as Low as 1.225 V

? 1.5% Feedback Reference Accuracy

? Operating Frequency Adjustable Between 50 kHz

and 1 MHz With Single Resistor

? Master or Slave Frequency Synchronization

? Adjustable Soft-Start

? Emulated Current Mode Control Architecture

? Wide Bandwidth Error Amplifier

? Built-In Protection

? HTSSOP-16EP (Exposed Pad)

? Create a Custom Design Using the LM25575 With

the WEBENCH? Power Designer

2 Applications

? Industrial

3 Description

The LM25575 is an easy to use 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 V to 42 V, the LM25575 delivers 1.5-A of

continuous output current with an integrated 330-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 1-MHz 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 LM25575

ensures robustness with cycle-by-cycle current limit,

short-circuit protection, thermal shut-down, and

remote shut-down. The device is available in a power

enhanced HTSSOP-16 package featuring an

exposed die attach pad for thermal dissipation. The

LM25575 is supported by the full suite of

WEBENCH? On-Line design tools.