Hey there,
I’ve been scrutinizing datasheets, reference designs and this forum for a week now and still couldn’t find a solution. It is pretty straightforward – I am trying to design my first power bank and chose to go with TI’s hardware because of quality and performance.
I know the functionality of simple 1s USB Designs but I am trying to make a 2s, USB PD (2 USB C: DRP + Source ^1) power bank capable of delivering 5-20v at 3A max through one of the ports.
- Is there a way to design this without a MCU? -
I’ve found standalone Battery Chargers (BQ246XX - programmable via hardware) and have been looking at the TPS25740/LM5175 combo recently (TPS25740EVM), yet the DRP has given me hard times. The TPS6598X Family seems to be capable of standalone mode, is it possible to simply combine these 3? (Have requested TPS65990 datasheet, but not received yet). Preferably, I’d like to go as small as possible, are the TUSB422 f.e. of any good use?
In a TI training video, the non-existent? TPS65988 worked together with a BQ25703A via I2C (TIDA-01515 Power Bank example) without MCU, but I don’t understand the need for flash storage…
Or is there even any need for 2s to reach 20v output? Instead of 2s1p, 1s2p offers reduced efficiency if I am not mistaken.
PCB space is extremely limited, the device’s goal is simple and I have little experience with I2C (Arduino), but none regarding MSP430s - so I really try and avoid MCUs.
Sorry for spamming so much, I am new to E2E (first post) so I thank you very much for any resources for further reading or any contribution.
Thanks for reading,
Karim Bingoel
^1 - Sink + Source or two DRP would also be acceptable, but I guess that is more complex. Any ideas? I'm highly interested
