[EE]:: All singing all dancing 1 to 4 cell LiIon charger / OTG output / Solar MPPT IIC, ... IC

150 pages of interesting reading:
*https://www.ti.com/lit/ds/symlink/bq25798.pdf
<https://www.ti.com/lit/ds/symlink/bq25798.pdf>*

I see specs for many ICs I'll never use.
Most I note with appropriate interest and pass by.
This one was cited on Stack Exchange EE in a user query and looked so
useful  to be worth flagging.

Very high efficiency buck/boost 1 to 4 cell LiIon charger and OTG USB C
output.
MPPT, solar and USB and "almost anything else" input.

About $US8.x/1 at Mouser and about half that at LCSC.
29 pin QFN to keep you awake :-) (0.4mm pin-pin)


TI SAY

BQ25798
*I2C Controlled, *
1- to 4-Cell, 5-A Buck-Boost Battery Charger with
Dual-Input Selector,
MPPT for Solar Panels and
Fast Backup Mode

Powers USB port from battery (USB OTG) –
2.8-V to 22-V OTG output voltage with 10-mV resolution to support USB-PD
PPS –
OTG output current regulation up to 3.32 A with 40-mA resolution
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