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CAMPBELL,
CA -- October 18, 2000 -- Summit
Microelectronics, Inc has introduced the next
generation of hot swap controllers for
telecommunications systems, the SMH4804;
a distributed power hot-swap controller for telecom
and data communications applications that require
multiple DC-DC converters. The This device was
developed to address the increasing power
requirements and complexity of distributed power
systems offerings telecom design engineers an
integrated method of controlling multiple
converters, with many new features previously
unseen on existing hot-swap controllers. The
SMH4804
utilizes programmable analog technology to provide
design engineers with a large degree of
flexibility, without the need for excessive
external discrete components.
One
of the major challenges facing telecom engineers
today is to maintain system operation during hot
swapping. This means that the hot swap function,
which historically was focused on the power
transitioning of the individual line card during
insertion and removal, now must also prevent
disruption of other cards in the system. The
SMH4804
not only provides the required soft start and
insertion detection circuitry that is required for
the most basic Hot Swap implementation, but also
features advanced fault detection capabilities
which monitor primary side voltage for over and
under voltage conditions as well as current
consumption of the line card.
Rick
Orlando, CEO and President, said, "Simple fault
detection is not enough in today's
telecommunications environment. Most of the
traditional fault-sensing techniques are prone to
inadvertent activation during unusual events, such
as initial powering of the card, or insertion of
other cards into the rack. The SMH4804
was designed to extend carrier-class availability
of the system and its real benefits are its ability
to ignore spurious events and only react to actual
faults. The SMH4804 was also developed with
easy-to-use programmable design tools to provide
near instant customizable options for varying power
management requirements of line cards thereby
improving time to market concerns for our telecom
customers."
Communications
between the secondary side and the hot swap
controller are essential in carrier-class designs.
Rick Orlando added, "Our customers are facing great
challenges in increasing the bandwidth or existing
equipment racks while trying to stay within the
installed power supply capabilities. Cards that
previously required a few amps now require tens of
amps from the same supply, greatly increasing the
complexity of the hot-swap function. It is not
uncommon for a single line card to have greater
than 4 supplies, with various combinations of DC/DC
converters and LDO's and various voltage sequencing
requirements. The SMH4804
represents a major step in the integration of the
advanced features that telecommunications designers
need today to provide carrier-class solutions to
their customers."
Operating
from a typical -48V supply, the SMH4804
provides in rush current limiting, but can also
provide current regulation, allowing large
capacitances to be charge regulated for a defined
period. Pin detect inputs are provided to ensure
board seating, while programmable delay times
ensure that the power is not applied during contact
bounce.
The
circuit breaker functions include programmable
Quick-Trip™ values and selectable duty-cycle
to latched-mode operation. Another new programmable
feature is the non-volatile circuit breaker, which
prevents power from being reapplied to a card that
has previously had an over current
fault.
The
SMH4804
controls up to 4 converters, and includes
programmable sequencing between successive
converters. Another feature is the additional
Enable pins that allow the device to hold each
successive converter until the previous converter
has reached its threshold (via opto-isolation). The
sequence timer input can also be enabled, allowing
forced shutdown of the -48V source in the event of
a fault detected on the secondary of the DC-DC
converter.
Programming
of the device is accomplished through a
standardized programming interface, driven from a
parallel port of a PC, and an intuitive GUI, which
allows the telecom designer to optimize the various
parameters of the SMH4804
for a particular line card. This standardized
interface allows the device to be programmed in
system, eliminating the need for external
programming. The GUI also outputs an industry
standard Hex file, which can be used with standard
programming or ATE equipment for production
quantities. The Hex file can also be submitted to
Summit for programming of the components prior to
product shipment. achieved by a Windows user
interface, on any PC. The device is also in system
programmable to allow development without the need
to remove the device. The SMH4804
is provided in SO-28 and TQFP48, which is just 7
square millimeters. And is available for full
production today, pricing in range of $6.00 - $8.00
depending on quantity.
A
video application note is available on CDROM upon
request. The Summit programming interface cable
kit, GUI software, SMH804 video application note on
CDROM and complete data sheet are available upon
request through the Summit website.
About Summit Microelectronics
Summit Microelectronics, Inc. develops
semiconductors that manage the power functions in
communications systems equipment. These devices
detect, localize, predict and analyze failures in
line cards to increase overall system integrity.
Using Summit's proprietary technology, customers
can achieve carrier-class availability, the highest
standard of reliability available today for
telecommunications and data communications
applications.
Founded in 1997, Summit is headquartered in
Campbell, California. The Company is ISO 9001
certified and is in the process of gaining ISO
14000 and STACK certification. Summit's website is
www.summitmicro.com.
###
Summit
Microelectronics, Inc.
1717 Fox Drive
San Jose, CA 95131-2312
Tel: +1.408-436-9890
Email:
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