circuit recommendation to switch between LiP battery and usb source?

[dotconnector]

RE: nrf52840QIAA - Can you recommend circuitry necessary to switch source between the usb and LiP battery?  Can you recommend inexpensive/small footprint boost circuitry to charge LiP? 

[awneil]

Look at Analog Devices (formerly Linear Technology), Texas Instruments, Maxim, et al ...

Fpr the switching between sources, "power path" is the search term you need ...

[dotconnector]

thanks for the reply.  I see the 52840 has a pmic of a sort built-in, but I notice only buck regulators.  I'd like to understand if the pmic internally decides which source to use, battery or usb.  Or how much of this circuitry has to provided externally?  I thought this would be a really common design issue with off-the-shelf solution.  

[awneil]

What does the datasheet tell you ?