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Semtech Launches Miniaturized Feature Rich 10A Synchronous Buck Regulator Platform
Semtech, a supplier of analog and mixed-signal semiconductors, has
announced the SC417, the first device in a new family of high current
point-of-load voltage regulators.
According to the company, benchmark power density is achieved through
advanced packaging, optimized power circuit layout and matching of
driver to internal power switches. As the number of power rails in a
system grows, driven by increasing bandwidth, content and
functionality, a versatile 10A regulator in what approaches chip-scale
packaging enables the next generation of complex system loads.
The SC417 has a wide input voltage range of 3V to 28V and achieves high
efficiencies over an extended load range. The programmable LDO can be
used to provide the 5V necessary for the gate drive bias, allowing the
part to operate from a single rail. Internal crossover circuitry
bypasses the LDO after startup if the LDO and buck outputs are the
same, for optimum efficiency. Pseudo fixed frequency adaptive on-time
control gives the part excellent transient response, reduces the output
filter capacitance required and greatly simplifies the design process
by removing external compensation components, the company said.
Featuring Semtech's SmartDrive technology, which reduces EMI and
eliminates snubbing components and gate drive resistors, the company
said the SC417 regulator also features attractive power save functions.
Selectable ultrasonic power save allows the device to operate in
discontinuous conduction mode at light load conditions, saving
quiescent current, while limiting the "floor" frequency to avoid
audible noise. The second device in the SC4x7 family, the SC427, with
regular power save (no frequency floor) will release next quarter.
Semtech's Smart Power Save technique enables these devices to re-enter
continuous conduction mode when active loads attempt to pull the output
high while in power save mode, pulling the output back down and
avoiding over voltage latch-off, the company said.
"The SC417 10A buck regulator in a 5mm x 5mm QFN package breaks new
ground with regards to the footprint and profile required for
point-of-load power solutions. Able to be used as a module replacement,
its flexibility, ease of use and full feature set make it broadly
applicable and very attractive to power supply designers," said Alan
Burchfield, Product Marketing Manager for Semtech's Power Management
Group. "The wide input operating range permits its use in a broad range
of applications including ultra-mobile, industrial and notebook PCs to
multi-function printers and digital TV."
((Comments on this story may be sent to newsdesk@closeupmedia.com))
((Distributed via M2 Communications Ltd - http://www.m2.com))
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