New Industry Products

Microsemi Intros New LX1742 Boost Controller

July 17, 2002 by Jeff Shepard

Microsemi Corp. (Irvine, CA) announced a new high-efficiency, high-voltage boost controller for battery-powered applications, including pagers, mobile phones, PDAs, hand-held computers and LED drivers. Designated the LX1742, the new controller features a pseudo-hysteretic, pulse-frequency modulation topology designed to deliver greater than 80 percent efficiency, reduce board size and lower total circuit costs.

The LX1742 adds an internal n-channel MOSFET to the LX1741 device introduced in February. Both controllers guarantee start-up operation at 1.6V input and have an input range to 6.0V. The quiescent supply current is only 80µA (typical) and the shutdown current is less than 1µA. Output voltages as high as 25V are programmed by using two external resistors in conjunction with the LX1742's feedback pin. Dynamic voltage adjustments of ±15 percent can be achieved by either an analog reference signal or a direct PWM input signal applied to the ADJ pin.

The LX1742, offered in the industry-standard, eight-pin, MSOP, surface-mount package, is priced at $0.92 in 10,000-unit quantities.