New Microsemi Integrated Circuits Generate Both Boost Drive for LEDs and Adjustable Bias Voltages for LCD Displays
Monday August 25, 8:32 am ET
-- Dual Function in Single Surface Mount Packages Save Space, Cut System Cost
IRVINE, Calif.--(BUSINESS WIRE)--Aug. 25, 2003-- -- Greater Than 90% Efficiency: Ideal for Portable Applications
Microsemi Corp. (Nasdaq:MSCC - News), a leading manufacturer of analog and mixed signal integrated circuits, has introduced two new ICs that in a single compact package boost a low voltage supply to drive a series string of white or color LEDs, while simultaneously providing an adjustable bias voltage for the LCD displays they light.
The LX1744(TM) PFM boost controller provides an adjustable LED drive and one adjustable +/- bias supply output. The LX1745(TM) controller includes the LED drive and two adjustable bias supplies. With efficiency rated at greater than 90%, the new regulators save space and system cost in handheld applications that include PDAs, smart-phones, digital cameras and pagers.
The two boost controllers are optimized for portable power management. They include a logic-controlled shutdown current of less than 1microamp, with a choice of input voltage ranging from 1.6V to 6.0V. Start-up is guaranteed at 1.6V, with sustained operation from as little as 1.1V.
LED drive currents are easily programmed using one external current sense resistor in series with the LEDs. Depending upon the MOSFET selected, the LX1744 can support an LED drive in excess of 1.5 watts and the LX1745 in excess of 1.0 watt.
Dynamic current output adjustment for 0 to 100% full range LED dimming can be accomplished with either a direct PWM input signal or an analog reference signal. The LCD Bias output voltage is adjustable up to +/-15% (typ.)
The LX1744 is available in a choice of 14-pin TSSOP or 16-pin MLPQ plastic packages, priced at $1.49 and $1.51 respectively in 10K quantities. The LX1745, in a 20-pin TSSOP plastic package, is priced at $1.94 in 10k quantities.
Complete technical information is available on the Microsemi Web site, www.Microsemi.com. Samples can be ordered through this site, or from Microsemi sales representatives and franchised distributors.
About Microsemi
Microsemi is a leading designer, manufacturer and marketer of analog, mixed-signal and discrete semiconductors. The company's semiconductors typically 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 complete circuit solutions that enhance customer designs by improving reliability, battery optimization, reducing size or protecting circuits. Markets the company serves include mobile connectivity, computer/peripherals, datacom, medical, industrial, automotive, digital media, space/satellite and military.
More information may be obtained by contacting the company directly or by visiting its Web site at microsemi.com.
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Investor Inquiries: David R. Sonksen, Microsemi Corp., Irvine, Calif. 949-221-7101.
Contact:
Microsemi Corp., Irvine
David R. Sonksen (financial), 949-221-7101
or
Cliff Silver (editorial), 949-221-7112
Source: Microsemi Corp. |
