100V LM5073 Features Programmable DC Current Limit up to 800 mA
Power Conversion and Intelligent Motion Conference, NUREMBERG, Germany,
May 22 /PRNewswire-FirstCall/ -- National Semiconductor Corporation (NYSE:
NSM) today introduced a Power-over-Ethernet (PoE) powered device (PD)
controller with adjustable output current level and the ability to
interface with any DC-DC converter topology.
The industry's highest power PoE controller, National's new LM5073
integrates a programmable interface port including a hot-swap controller
that exceeds the standard IEEE 802.3af specifications, allowing designers
to operate PoE appliances at power levels of 30W or more. For greater
flexibility, the LM5073 separates the PD interface from the DC-DC converter
to support a wide variety of isolated and non-isolated DC-DC converter
topologies. Applications include IP telephony, remote security cameras,
card readers, wireless access points, PoE-enabled industrial automation
systems and point-of-sale terminals.
From May 22-24, National will demonstrate the new LM5073 PoE controller
in hall 12, booth 329 at the Power Conversion and Intelligent Motion (PCIM)
Conference in Nuremberg, Germany. PCIM is one of the industry's leading
forums for presenting and discussing power electronics and its applications
in intelligent motion.
The LM5073 PoE controller supports PD designs that are fully compliant
with the IEEE 802.3af standard. If more power is required, the low RDS(ON)
hot-swap MOSFET and programmable DC current limit extend the range of
LM5073 applications to more than twice the power level of IEEE 802.3af
compliant devices. The LM5073 also provides the flexibility for the PD to
accept power from unregulated auxiliary sources such as AC adapters and
solar cells in a variety of configurations. The 100V maximum voltage rating
simplifies selection of the voltage suppressor that protects the PD from
network transients.
The LM5073 joins National's family of PoE devices, including the
LM5072, which integrates a DC-DC controller with the higher PoE power
capability of the LM5073, the LM5070, which integrates a 375 mA PoE
interface circuit with a DC-DC controller, and the LM5071, a single chip
solution specifically designed for PoE devices that operate from
alternative power sources. National's LM5073 can be used with the DP83848
single port or DP83849 dual port 10/100 Mbps Ethernet physical layer device
to provide a space and cost effective system solution for PoE Ethernet
compliant designs. The power for the node (following the PoE standard) is
supplied by standard CAT5 cable and connectors via the National devices,
which eliminates the need for expensive external power supplies while
delivering full Ethernet connectivity.
Technical Features of the New PoE Controller
Offered in a 14-pin TSSOP with exposed pad for improved thermal
performance, the LM5073 integrates a 100V, 700 milli-Ohm, N-channel MOSFET
as well as the PD signature and under-voltage lockout resistors. It
provides configurable front and rear auxiliary inputs that accept power
from AC adapters to reduce the power draw on the PoE power sourcing
equipment. Complementary control outputs provide a flexible interface to
the best DC-DC converter topology for the particular application. For
non-isolated applications, the LM5073 can be paired with National's LM5007
and LM5010 buck regulators or popular LM5574, LM5575 and LM5576
high-voltage SIMPLE SWITCHER(R) product family. For higher-power isolated
systems, the LM5073 can be paired with National's LM5020 or LM5026
pulse-width modulation (PWM) controllers. For more information on the
LM5073 or to order samples and an evaluation board, visit
http://www.national.com/pf/LM/LM5073.html.
About National's Power Management Products
National solves power management design problems in space- and energy-
constrained applications from feature-rich handheld devices through large
line-powered systems. From the novice power designer to the power expert,
National's products, people and design tools enable customers to design
green- powered systems with complex power supplies in the shortest amount
of time. High-performance products include switching regulators, such as
National's flagship SIMPLE SWITCHER(R) family, and application-specific
products including white-LED drivers and Power-over-Ethernet controllers.
More information about National's power management products is available at
http://power.national.com.
Pricing and Availability
National's new LM5073 is available now and priced at $1.30 in
1,000-unit quantities.
About National Semiconductor
National Semiconductor, the industry's premier analog company, creates
high-value analog devices and subsystems. National's leading-edge products
include power management circuits, display drivers, audio and operational
amplifiers, interface products and data conversion solutions. National's
key analog markets include wireless handsets, displays and a variety of
broad electronics markets, including medical, automotive, industrial, and
test and measurement applications. Headquartered in Santa Clara, Calif.,
National reported sales of $2.16 billion for fiscal 2006, which ended May
28, 2006. Additional company and product information is available at
http://www.national.com.
National Semiconductor is a registered trademark of National
Semiconductor Corporation. All other brands or product names are trademarks
or registered trademarks of their respective holders.
Media Contact
Gayle Bullock
National Semiconductor
(408) 721-2033
gayle.bullock@nsc.com
Reader Information
Design Support Group
(800) 272-9959
http://www.national.com
SOURCE National Semiconductor Corporation
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Related links:
http://www.national.com/
CONTACT:
Gayle Bullock of National Semiconductor,
+1-408-721-2033, gayle.bullock@nsc.com
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