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October 16, 2008
LM25575Q0
SIMPLE SWITCHER 42V, 1.5A Step-Down Switching
Regulator
General Description
The LM25575Q0 is an easy to use SIMPLE SWITCHER
buck regulator which allows design engineers to design and
optimize a robust power supply using a minimum set of com-
ponents. Operating with an input voltage range of 6 - 42V, the
LM25575Q0 delivers 1.5A of continuous output current with
an integrated 330m
N-Channel MOSFET. The regulator uti-
lizes 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 al-
low 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 LM25575Q0 guarantees 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 TSSOP-16 package featuring an exposed
die attach pad for thermal dissipation. The LM25575Q0 is
supported by the full suite of WEBENCH On-Line design
tools.
Features
■ LM25575Q0 is an Automotive Grade product that is AEC-
Q100 grade 0 qualified
■ -40°C to 150°C operating junction temperature
■ Integrated 42V, 330m N-channel MOSFET
■ Ultra-wide input voltage range from 6V to 42V
■ Adjustable output voltage as low as 1.225V
■ 1.65% feedback reference accuracy
■ Operating frequency adjustable between 50kHz and
1MHz with single resistor
■ Master or slave frequency synchronization
■ Adjustable soft-start
■ Emulated current mode control architecture
■ Wide bandwidth error amplifier
■ Built-in protection
Package
■ TSSOP-16EP (Exposed Pad)
Applications
■ Automotive
■ Industrial
Simplified Application Schematic
30071101
WEBENCH is a registered trademark of National Semiconductor Corporation.
2008 National Semiconductor Corporation
300711
www.national.com
LM25575Q0
SIMPLE
SWITCHER
42V,
1.5A
Step-Down
Switching
Regulator
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