Today an increasing number of portable electronic devices like PDA’s, cameras, mobile phones and other portable storage devices use the USB interface to communicate and exchange data with PC’s. This paper addresses the power management concerns of these devices by explaining how the boost mode operation of bq24150/1/2 devices can be used to easily meet the power requirements specified in the USB-OTG standard. Various other features like light load efficiency (PFM mode), overload protection are also discussed.