# USB-C PD # In [this video](https://www.youtube.com/watch?v=WiyAI1VHXDM), we showcased a tiny, fully functional USB-C powerbank that supports charging speeds up to 12W and weighs about the same as an alkaline AA battery. In a [following video](https://www.youtube.com/watch?v=hIVcsL-rVuM) , the highly integrated TPS25751D chip from TI was used to build a 45W powerbank charging circuit, shown below. Our favourite PD protocol chips for ease-of-use are from TI, Diodes, and Injoinic. ![[usbcdesign.png|554]] *Example design: PD system section of BMS X based on [TIDA-050047](https://www.ti.com/tool/TIDA-050047) reference design* To do: - make highly efficient 240W EPR battery system - make fully featured USB-C PD powerbanks with newer (and more expensive) technology than competing solutions, using casing materials that are most environmentally friendly based on a detailed analysis