Industry's First Fully Integrated 22V, 5A Regulator in 4 mm
                              Package

IRVINE, Calif., Feb. 18, 2010 (GLOBE NEWSWIRE) -- Microsemi Corporation
(Nasdaq:MSCC), a leading manufacturer of high performance analog/mixed
signal integrated circuits and high reliability semiconductors, today
extended its family of DC-to-DC controllers and switching regulators
with the introduction of a synchronous buck switching regulator in a
compact multi-chip module with built-in power functionality. The
NX9415(TM) is designed for step-down DC-to-DC converter applications in
LCD TVs, set-top boxes, DSL modems, netbooks, telecom, networking and
other point-of-load DC-to-DC applications.

Microsemi's use of advanced multi-chip module (MCM) packaging enables
the NX9415 to convert 8- to 22-volt input voltages down to as low as
0.8 volts with an output current of up to 5A amps, while occupying a
small, 4mm x 4mm footprint and maintaining the device's high-frequency
capability. Alternative, monolithic silicon solutions require a die
size with a significantly larger footprint in order to achieve the same
high frequency and low drain to source on-resistance (RDS(on)) as the
NX9415.

"The NX9415 solves the problem of achieving up to 5 amps output current
on an 8 to 22 volt bus using the smallest possible switching regulator
with internal power FETs," said Amir Asvadi, Director of Marketing with
Microsemi's Analog Mixed Signal Group.

"We continue to drive down the size and cost of high-output integrated
power solutions using advanced MCM packaging, while also offering a
growing family of monolithic controllers that work with our customers'
choice of external power devices," Asvadi said. "The unique advantages
of MCM DC-to-DC solutions as compared to monolithic solutions are
especially significant in the 12-volt-and-higher voltage input range
that, until now, required an external adaptor."

The NX9415 incorporates a 2MHz controller that supports an 8- to
22-volt input supply voltage, plus two metal oxide semiconductor field
effect transistors (MOSFETs) with a low, 31-milliohm RDS(on) and the
ability to deliver 5 amps of maximum current output. An internal 5-volt
regulator, which provides the voltage supply to internal logic and a
driver circuit, allows for single supply operation. The module operates
from 200kHz to 2.2MHz and employs loss-less current limiting by sensing
the RDS(on) of the synchronous MOSFETs.

Other key features include an internal boost Schottky diode, adjustable
frequency for circuit optimization, and adjustable over-current
protection with Hiccup logic. Additionally, the module features thermal
shutdown capability, a 5-volt gate drive and adaptive deadband control,
as well as an internal digital soft-start capability, and a 5-volt
undervoltage lock-out and shutdown capability.

Microsemi offers a broad and growing family of DC-to-DC products that
support up to 40-volt input voltages across a wide range of current
output, up to 40 amps. The family includes switching regulators with
built-in power FETs, as well as controllers that use external power
FETs and can operate at frequencies up to 2MHz.

In addition to the NX9415, Microsemi plans to extend its switching
regulator family to include both monolithic and multi-chip-module (MCM)
products ranging from 1-amp to 8-amp output currents and input voltages
of 5-volts to 18-volts, giving customers a broad portfolio of options.

Technical data sheets are available on the Microsemi website:
www.microsemi.com. The NX9415 is packaged in a 4mm x 4mm, 24-lead
quad-flat no-lead (QFN) package with excellent thermal capability.
Samples are available immediately, and the module is priced at $0.50 in
OEM volumes of 1,000.

Microsemi will feature the NX9415 and other power product innovations
in Booth 122 at the Applied Power Electronics Conference and Exhibition
(APEC), February 21-25, at the Palm Springs Convention Center, Palm
Springs, Calif.

About Microsemi

Microsemi Corporation, with corporate headquarters in Irvine,
California, is a leading designer, manufacturer and marketer of high
performance analog and mixed-signal integrated circuits, high
reliability semiconductors and RF subsystems. The company's
semiconductors manage and control or regulate power, protect against
transient voltage spikes and transmit, receive and amplify signals.

Microsemi's products include individual components as well as
integrated circuit solutions that enhance customer designs by improving
performance and reliability, battery optimization, reducing size or
protecting circuits. The principal markets the company serves include
implanted medical, defense/aerospace and satellite, notebook computers,
monitors and LCD TVs, automotive and mobile connectivity applications.
More information may be obtained by contacting the company directly or
by visiting its website at http://www.microsemi.com.

The Microsemi Corporation logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=1233

"Safe Harbor" Statement under the Private Securities Litigation Reform
Act of 1995: Any statements set forth in this news release that are not
entirely historical and factual in nature, including without limitation
statements concerning the introduction of a synchronous buck switching
regulator in a compact multi-chip module with built-in power
functionality, are forward-looking statements. These forward-looking
statements are based on our current expectations and are inherently
subject to risks and uncertainties that could cause actual results to
differ materially from those expressed in the forward-looking
statements. The potential risks and uncertainties include, but are not
limited to, such factors as rapidly changing technology and product
obsolescence, potential cost increases, variations in customer order
preferences, weakness or competitive pricing environment of the
marketplace, uncertain demand for and acceptance of the company's
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in-process or planned development or marketing and promotional
campaigns, difficulties foreseeing future demand, potential
non-realization of expected orders or non-realization of backlog,
product returns, product liability, and other potential unexpected
business and economic conditions or adverse changes in current or
expected industry conditions, difficulties and costs of protecting
patents and other proprietary rights, inventory obsolescence and
difficulties regarding customer qualification of products. In addition
to these factors and any other factors mentioned elsewhere in this news
release, the reader should refer as well to the factors, uncertainties
or risks identified in the company's most recent Form 10-K and all
subsequent Form 10-Q reports filed by Microsemi with the SEC.
Additional risk factors may be identified from time to time in
Microsemi's future filings. The forward-looking statements included in
this release speak only as of the date hereof, and Microsemi does not
undertake any obligation to update these forward-looking statements to
reflect subsequent events or circumstances.


CONTACT:  Microsemi Corporation
          Financial Contact:
          John Hohener, Vice President and CFO
            (949) 221-7100
          Editorial Contact:
          Cliff Silver, Corporate Communications Manager
            (949) 221-7100