The Si9168 is a synchronous buck or boost controller for 2-cell Li+ battery operated portable communication devices. Designed for use with external high-frequency MOSFETs, the Si9168 is ideal for providing power to various power amplifiers such as TDMA, CDMA, GSM, or PCS. For ultra-high efficiency, converters are designed to operate in synchronous rectified PWM mode under full load, while transforming into externally controlled pulse skipping mode (PSM) under light load conditions. All these features are provided by Si9168 without sacrificing system integration requirements of fitting these