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San
Jose, Calif. - September 27, 2005
- Summit
Microelectronics has expanded
its programmable power management
family with the introduction of
an innovative, dual-feed active
OR'ing hot-swap controller. The
SMH4814
device can monitor and control
two independent -48V feeds,
allowing for redundant power
supply control. Furthermore, it
eliminates the need for passive
OR'ing diodes, which are bulky
and significantly contribute to
system power dissipation. Using
Summit's GUI-based, non-volatile
programming technology, system
designers can customize the
SMH4814 to address their specific
power management and control
requirements while using a single
part number for different
platforms.
The SMH4814 provides precise
current and voltage control
during turn-on and operation
while an internal shunt regulator
allows compatibility with a very
wide input voltage range. Unlike
traditional implementations that
utilize OR'ing diodes to connect
redundant power supplies, the
SMH4814 controls external
N-channel field effect
transistors (FETs), thereby
significantly reducing total
system power dissipation. This
in turn minimizes costs and board
space associated with cooling
fans and heat-sinks. Lower power
levels also eliminate the need
for through-hole components, so
manufacturing complexity is
reduced.
The SMH4814 offers a variety of
protection features that increase
system performance and
reliability. Included are
soft-start power-up,
"over-current circuit-breaker"
functions and integrated
over-voltage and under-voltage
monitors, allowing for full
protection from system failures.
The over-current trip levels,
forced shutdown mode, and
over-voltage/under-voltage
monitor thresholds are fully
programmable allowing for a high
degree of design flexibility.
Additionally, a programmable
glitch filter is provided on the
monitor circuits to prevent false
alarms during transients.
The SMH4814 continuously monitors
the incoming feeds and switches
to the most negative feed as
necessary. In addition, it
hot-swaps and sequences up to
four independent downstream DC-DC
converters with programmable
sequence order and delay times.
The SMH4814 ensures that a series
of conditions are met before the
external power MOSFET is turned
on and the supply voltage is
ramped up in a controlled,
well-behaved manner. The
device's integration, versatility
and high-performance meet the
most stringent requirements for
high-end systems requiring
maximum up-time. Furthermore,
all these features are offered in
a space-saving 5x5mm QFN package,
providing an 85% footprint
reduction over the traditional
SOIC-28 package.
The SMH4814 allows a variety of
add-in cards to be removed from
or inserted into a fully powered
host platform without an
interruption in the system's
operation and without damage to
any of the devices on the board.
Typical applications are those
with -48V power distribution,
including high-availability
servers, wireless base stations,
central office switches, and
telecommunications line cards
that demand both on-the-fly
configurability and redundant
power supply to the system.
Other applications include
systems designed to support the
Advanced Telecom Computing
Architecture (AdvancedTCA™)
specifications, especially the
ones with increasing power
levels.
Programming is achieved via the
convenient I2C bus and
configuration data is safely
stored in non-volatile EEPROM
memory of which 256 bytes are
available for user data storage.
The devices can be programmed
during development and then used
in a "fixed" configuration or
they may be re-programmed
in-system via the I2C interface.
Packaging, Pricing, and
Availability
The SMH4814 is offered in both
the commercial and the industrial
operating temperature range and
is packaged in the space-saving
5x5 28-pad QFN and 28-pin SOIC
packages. Available now in
production quantities, the
SMH4814 is priced at $4.18 each
in the commercial temperature
range, and at $6.43 in the
industrial temperature range for
the SOIC package in quantities of
1,000 devices. Unit pricing for
the QFN package is at $4.37 in
the commercial temperature range
and $6.75 in the industrial
temperature range in quantities
of 1,000 units.
Design Software and Programmer
for Prototype Development
To speed user product
development, Summit offers
customers the SMH4814 companion
evaluation board providing a
graphic user interface (GUI)
software so designers can quickly
see the features and benefits and
design a prototype power supply
with the SMH4814. This is a
complete development tool that
lets designers easily manipulate
the characteristics of their
systems. The SMH4814EV design
kits includes menu-driven
Microsoft Windows® graphic
user interface (GUI) software to
automate programming tasks and
also includes all necessary
hardware to interface to the
parallel or USB port of a laptop
or PC.
Once a user completes design and
prototyping, the SMH4814 kit
automatically generates a HEX
data file that can be transmitted
to Summit for review and
approval. Summit then assigns a
unique customer identification
code to the HEX file and programs
the customer's production devices
prior to final electrical test
operations. This ensures that
the device will operate properly
in the end application. The
design kit software can be
downloaded today from Summit's
website (www.summitmicro.com).
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About
Summit Microelectronics --
"Programmable power for a
digital world".
Summit Microelectronics supplies
semiconductors that manage and
provide power functions in
networking/communications,
storage/computing, industrial,
military, and consumer products.
Customers can very rapidly tailor
Summit's programmable analog
technology to multiple
applications by programming the
same part.
Founded in 1997, Summit is
headquartered in San Jose,
California. The Company is ISO
9001 certified.
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