LM5576MH National Semiconductor, LM5576MH Datasheet
LM5576MH
Manufacturer Part Number
LM5576MH
Description
IC,SMPS CONTROLLER,CURRENT-MODE,TSSOP,20PIN,PLASTIC
Manufacturer
National Semiconductor
Specifications of LM5576MH
Rohs Compliant
NO
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© 2007 National Semiconductor Corporation
LM5576
SIMPLE SWITCHER® 75V, 3A Step-Down Switching
Regulator
General Description
The LM5576 is an easy to use SIMPLE SWITCHER® buck
regulator which allows design engineers to design and opti-
mize a robust power supply using a minimum set of compo-
nents. Operating with an input voltage range of 6 - 75V, the
LM5576 delivers 3A of continuous output current with an in-
tegrated 170mΩ N-Channel MOSFET. The regulator utilizes
an Emulated Current Mode architecture which provides in-
herent 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 operat-
ing frequency is adjustable from 50kHz to 500kHz to allow
optimization of size and efficiency. To reduce EMI, a frequen-
cy synchronization pin allows multiple IC’s from the
LM(2)557x family to self-synchronize or to synchronize to an
external clock. The LM5576 guarantees robustness with cy-
cle-by-cycle current limit, short-circuit protection, thermal
shut-down, and remote shut-down. The device is available in
a power enhanced TSSOP-20 package featuring an exposed
die attach pad for thermal dissipation. The LM5576 is sup-
ported by the full suite of WEBENCH
Simplified Application Schematic
WEBENCH
®
is a registered trademark of National Semiconductor Corporation.
®
On-Line design tools.
201899
Features
■
■
■
■
■
■
■
■
■
■
Package
■
Integrated 75V, 170mΩ N-channel MOSFET
Ultra-wide input voltage range from 6V to 75V
Adjustable output voltage as low as 1.225V
1.5% feedback reference accuracy
Operating frequency adjustable between 50kHz and
500kHz with single resistor
Master or slave frequency synchronization
Adjustable soft-start
Emulated current mode control architecture
Wide bandwidth error amplifier
Built-in protection
TSSOP-20EP (Exposed Pad)
20189901
www.national.com
March 2007
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