Other Parts Discussed in Thread: TPS92390, BQ25713, BQ25792, BQ25306, BQ25723, , TPS25750, BQ4050, TIDA-050047
I am designing a device that will run off 2x 18650 batteries in series (e.g. 7.4V, 2600mAh). I'm looking to understand if there's any fully integrated solution with USB C PD controller, Battery Charger, and Fuel Gauge. If not, I'm looking for help in understanding the differences in your product line and your recommendation for my application.
A few specifics about my design:
- Application: LED lighting (I am considering TPS92390 boost current regulator to drive the LEDs)
- Max operating power: 15W
- Battery: 2S 18650 (7.4V, 2600mAh). Battery pack will include protection circuitry, but temperature sensor will not be fed into our unit.
- Desired battery charge time < 2hrs.
- Power path required. We want to be able to power device from USB regardless of battery state.
- As we'd like to provide full power while being able to provide some energy to battery, this is driving the requirement of USB C PD controller as USB C 1.2 maxes at 15W. I am planning to use a 27W USB C charger setup for 9V,3A.
- There is no need for our device to supply power out (e.g. OTG).
- We need to be able to give 20% increments for battery life which I believe would require a fuel gauge to work reliably (please correct me if I'm wrong here).
I have looked at the following parts:
Battery Charger: BQ25306, BQ25713, BQ25730, BQ25723, BQ25703, BQ25792
PD Controller: TPS25750, TPS65987
Fuel Gauge: TPS65987, TPS25750, bq4050
I also found a reference design, TIDA-050047 using BQ25792 with TPS25750.
I understand the BQ25792 has a big difference of integrated FETs, but besides that these parts all look very similar. I'd appreciate any insight you have into the differences in these parts and what you'd recommend for my application (including any potential insight into chip shortage concern).