1 Features

• 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 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 LM25576 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-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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Application Schematic