synchronous buck converter IC

Vishay Intertechnology Inc. (Malvern, PA) recently introduced a synchronous buck converter IC that will power baseband and PA circuitry in satellite phones and other mobile communications handsets. The Si9167BQ is designed to be capable of delivering up to 600mA of output current and operates at frequencies up to 2MHz. The device is designed for use with Vishay's IHLP2525 inductor. When used together the device is 1.9mm high with output capacitance requirements of less than 10uF and peak-to-peak ripple as low as 10mV. According to Vishay, the Si9167BQ is designed to offer typical efficiencies of 95 percent under full-load conditions. The device features on-chip high-side and n-channel low-side switches designed to be optimized for high-frequency operation. The device also features a programmable pulse-skipping mode (PSM) that maintains high-efficiency operation under light-load conditions, while a 100 percent duty cycle in both PSM and full-power PWM modes ensures that battery power will be used to the fullest. The synchronizable PWM mode allows designers to fix switching frequency with a resistor. The Si9167BQ gives designers the best performance of any solution on the market in terms of efficiency, size, and synch range, said Tony Armstrong, product marketing director at Vishay Siliconix. It further minimizes the number of components required for a total solution, for which both active and passive components can be obtained from Vishay. The Si9167BQ has a footprint of less than 300mm. sq. The device is packaged in the surface mount TSSOP-20. In quantities of 100,000, pricing for the Si9167BQ is $2.00 each and samples are currently available.