Irvine, Calif. - Microsemi Corp.'s LX1672 high-frequency multiphase dc/dc controller chip is aimed at double-data-rate termination, multioutput power supplies, video card power supplies and set-top box applications. The chip, which is the second device in the company's LoadShare series, operates at 300, 500 or 600 kHz, has up to three independently regulated outputs from a two-phase pulse-width-modulation (PWM) controller and a linear regulator driver. Each PWM phase can deliver sufficient drive for external MOSFETs delivering up to 15 amps at an output down to 0.8 volts from a 3- to 12-V input while the linear regulator can deliver up to 5 A.
The two voltage-mode PWM phases can be configured for either a single biphase high-current output or two independently regulated outputs.
The LX1672 is available in a 24-pin TSSOP or MLPQ surface-mount package. It's priced at $1.38 and $1.44, respectively, in 10,000 pieces. Samples and evaluation boards can be ordered from the company Web site.
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