1 Features

1• Integrated 42-V, 170-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-20EP (Exposed Pad)

• Create a Custom Design Using the LM25576 With

the WEBENCH® Power Designer

2 Applications

• Industrial

3 Description

The LM25576 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 LM25576 delivers 3 A of continuous

output current with an integrated 170-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 lowduty

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 selfsynchronize

or to synchronize to an external clock.

The LM25576 ensures robustness with cycle-by-cycle

current limit, short-circuit protection, thermal shutdown,

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 is supported by the full suite of

WEBENCH® On-Line design tools.