Designing a Type-C Charger with 12V Input for Phone and Laptop Charging
I want to design a charging system that has type c output port. The charger will have its supply from a 12v battery. I want the type c to charge my mobile phone and can also charge my laptop. I know i am going to need a PD ic probably STUSB4500, FUSB302, or TPS25750.
My challenge now is i am trying to wrap my head around the voltage levels, for example my phone will require 5v to charge, my laptop will require 18.3v or there about to charge. Will i have to design a buck converter that can step down to 5v and also a boost converter that can boost 12v to 18.3v for the laptop? How will the PD switch between the boost converter and buck converter as needed? What IC can be recommeneded to use? I would appreciate help and directions on this project. If more information is needed i can drop more information.
My challenge now is i am trying to wrap my head around the voltage levels, for example my phone will require 5v to charge, my laptop will require 18.3v or there about to charge. Will i have to design a buck converter that can step down to 5v and also a boost converter that can boost 12v to 18.3v for the laptop? How will the PD switch between the boost converter and buck converter as needed? What IC can be recommeneded to use? I would appreciate help and directions on this project. If more information is needed i can drop more information.
Solution
You will need a buck converter (5V for phone), boost converter (18.3V for laptop), PD controller, and power multiplexer. The PD controller negotiates voltage, while the multiplexer switches between converters. Consider TPS62903 (buck), LM2733 (boost), and TPS65987D (multiplexer) as potential ICs. The system will dynamically adjust output based on the connected device's requirements.
