It uses an unknown 16 pin chip on the underside that directly controls the display, and an IP5328 power controller, the datasheet is in chinese but the scematic is easy to follow, I would guess the micro-b and lightning are paralled.
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Results of all my testing are below.
Q.C. 3.0 and 2.0 voltage range 5.15v to 12v

voltage and current before current limiting kicks in:
QC port 1: closest to Type-C port
5.15v at 3.10A = 15.97W
9.10v at 2.15A = 19.57W
12.0v at 1.50A = 18W
QC port 2: closest to LED
5.10v at 3.10A = 15.81W
9.07v at 2.15A = 19.5W
12.0v at 1.50A = 18W

Power output efficiency at 3.7v input
5v 88.31%
in: 3.70v 4.68A 17.36W
out: 5.11v 3.00A 15.33W

9v 87.23%
in: 3.70v 5.95A 22.02W
out: 9.06v 2.12A 19.21W

12v 85.19%
in: 3.70v 5.71A 21.13W
out: 12.0v 1.50A 18.00W

Charge efficiency
Micro-B: 87.12%
in: 4.97v 1.91A 9.49W
out: 3.81v 2.17A 8.27W

Lightning: 85.99%
in: 5.01v 0.85A 4.26W
out: 3.70v 0.99A 3.66W

Type-C 5v: 85.53%
in: 5.03v 1.85A 9.31W
out: 3.81v 2.09A 7.96W

Type-C 9v: 72.10%
in: 8.86v 1.45A 16.39W
out: 3.90v 3.03A 11.82W

Passthrough efficiency 92.19%
in: 5.03v 1.07A 5.38W
charge: 3.78v 0.40A 1.51W
5v out: 4.60v 0.75A 3.45W
Note: 0.75A output draw is the maximum current you can draw before the charge current going into the battery starts dropping

no longer charging current: 89.70%
in: 5.03v 1.11A 5.58W
out: 4.55v 1.10A 5.01W

Idle consumption 4v battery
0.084mA off
24.00mA on 5v
27.30mA on 5v with Q.C. trigger plugged in
44.90mA on 9v "
55.90mA on 12v "
60mA LED on and powerbank off

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