The Si9167 is a high-frequency synchronous dc-to-dc switching buck regulator, with an operating range suitable for two-cell Li+ battery-powered applications. Capable of operation up to 2 MHz, the Si9167 can be used to supply power amplifiers and to power up baseband circuits in satellite phones. Its high operating frequency reduces the size of inductor and capacitor components, while its low on-resistance internal driver ensures maximum power conversion efficiency.