Microsemi Corp. today announced the introduction of a new high efficiency, high voltage boost controller for battery-powered applications including pagers, mobile phones, PDAs, handheld computers an LED drivers. Designated the LX1741(TM), the new controller features a pseudo-hysteretic pulse frequency modulation topology designed to deliver greater than 85% efficiency, reduce board size and lower cost. The LX1741's design is targeted specifically to provide enhancements that improve overall performance under very light load currents by implementing control circuitry optimized for portable systems. Its quiescent supply current is only 80 micro amps (typical) and shutdown current is less than 1 micro amp. Designers have maximum flexibility in respect to their system's efficiency and cost, by their choice of external N-Channel MOSFETs to use with the LX1741. Start-up operation is guaranteed at 1.6V input, and with an input range that extends to 6.0V, the LX1741 allows for a wide selection of system battery designs. Output voltage is programmed easily with two external resistors in conjunction with the feedback pin. Depending upon the choice of MOSFETs, the LX1741 is capable of achieving output voltages much higher than 40V. A simple dynamic adjustment of output voltage is achieved by an analog reference signal or direct PWM input signal applied to the ADJ pin. The LX1741 is available in a choice of the MLP or the MSOP industry-standard 8-pin surface mount packages. In 10K quantities, the LX1741 is priced at $0.66 in the MLP package and at $0.67 in the MSOP package. Complete technical information and data sheets can be found on the Microsemi's Web site, www.Microsemi.com, and samples purchased from the site's online store or through Microsemi franchised distributors. "Our new boost controller was designed with specifications we believe meet the very specific needs of our mobile product customers," said Kelly Jones, vice president and general manager of Microsemi Integrated Products. Integrated Products is the new umbrella organization unifying Microsemi's three Southern California integrated circuit operations. Previously, the circuit design centers in Carlsbad and Los Angeles were known as Microsemi MicroPower and Micro WaveSys, respectively, and the analog/mixed signal design and manufacturing operations in Garden Grove was named Linfinity Microelectronics.

Press Release