LM25576, LM25576-Q1
www.ti.com
SNVS470G –JANUARY 2007–REVISED APRIL 2013
LM25576/LM25576-Q1 SIMPLE SWITCHER® 42V, 3A Step-Down Switching Regulator
Check for Samples: LM25576, LM25576-Q1
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FEATURES
DESCRIPTION
The LM25576 is an easy to use SIMPLE
SWITCHER® buck regulator which allows design
engineers to design and optimize a robust power
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LM25576-Q1 is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (−40°C to +
125°C Operating Junction Temperature)
supply using
a
minimum set of components.
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Integrated 42V, 170mΩ N-channel MOSFET
Ultra-Wide Input Voltage Range from 6V to 42V
Adjustable Output Voltage as Low as 1.225V
1.5% Feedback Reference Accuracy
Operating with an input voltage range of 6 - 42V, the
LM25576 delivers 3A of continuous output current
with an integrated 170mΩ 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 50kHz to
1MHz 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.
Operating Frequency Adjustable Between
50kHz and 1MHz with Single Resistor
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Master or Slave Frequency Synchronization
Adjustable Soft-Start
Emulated Current Mode Control Architecture
Wide Bandwidth Error Amplifier
Built-in Protection
Automotive Grade Product Datasheet that is
AEC-Q100 Grade 0 Qualified is Available Upon
Request.
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(−40°C to + 150°C Operating Junction
Temperature)
APPLICATIONS
PACKAGE
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Automotive
Industrial
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HTSSOP-20EP (Exposed Pad)
Simplified Application Schematic
VIN
BST
SW
VIN
VOUT
SYNC
LM25576
SD
IS
OUT
FB
RT
VCC
SS
COMP
GND
RAMP
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
WEBENCH is a registered trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2013, Texas Instruments Incorporated