New Industry Products

Microsemi Intros LX1673 Power Supply Controller

August 11, 2002 by Jeff Shepard

Microsemi Corp. (Irvine, CA) announced a new highly integrated, high-frequency, power supply controller combining a synchronous PWM switching regulator with an adjustable linear regulator driver. Designated the LX1673, the new dc/dc controller is designed to reduce circuit component costs in video card power supplies, double data rate memory termination, computer peripherals, computer add-on cards, low-voltage applications and 3.3V power conversion applications.

Featuring two independently regulated outputs, the LX1673 can provide outputs as low as 0.8V from an internal one-percent reference. The PWM output is capable of sourcing up to 15A, while the adjustable low dropout regulator can simultaneously supply up to 5A for input/output, memory and other supplies surrounding microprocessor designs. The LX1673 can be configured for power conversion from any input voltage up to 12V, and three high-switching frequency options are provided at 300KHz, 600KHz and 900KHz. High-current MOSFET drivers are integrated as are soft-start and power sequencing control functions. Integrated hiccup-mode current limiting enables the LX1673 to monitor maximum current-limit conditions without the use of costly external-current sense resistors.

The LX1673 is available for immediate sampling and delivery in a space-saving, 20-pin, MLP (Jedec MO-229), surface-mount, power package, with 10,000-unit quantity pricing at $0.99.