1 Features

1• Qualified for Automotive Applications

• AEC-Q100 Qualified With the Following Results:

– Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

• 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-20 EP (Exposed Pad)

• Create a Custom Design Using the LM25576-Q1

With the WEBENCH® Power Designer

2 Applications

• Industrial

3 Description

The LM25576-Q1 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-Q1 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-Q1

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-Q1 is supported by the full suite of

WEBENCH® On-Line design tools.