Hi all,
I'm working on a design that in which I would like to use a one cell 3000 or 4000mAh li-ion battery. I would like to charge this battery over the same usb connection that I'll be using for serial communication with my microcontroller (using an onboard serial converter). The absolute worst-case peak load of the microcontroller and the peripherals is 1.5A at 5V (although it will normally be much less).
Since the device needs to run off the usb port even when the battery is dead, USB-C with its 1.5A of current in the default profile seems to be perfect. This would offer me enough current to both charge the battery and run my system at the same time.
However, I would still like to be able to charge it (slowly) using regular USB 2.0. I would love to use one IC to charge the battery and power the system (so some kind of power path management), utilizing the USB-C current when possible but respecting the 500mA usb 2.0 inrush spec when connected to a usb 2.0 port.
So basically I'm looking for an IC (or it that doesn't exist another nice way too):
Utilize the 1.5A of USB-C when present to charge the battery while maintaining stable power to the system (automatic power management of load/battery)
While adhering to the USB 2.0 spec of 500mAh when connected to a USB 2.0 port to charge the battery (/limit the discharge of the battery when the system is being used)
Thanks!