Automatic 2S Li-ion Charger Control

I’m building a small home-electronics product that runs from a 2-cell Li-ion pack (8.4 V when full). I need a proven control circuit that automatically disconnects a 9 V wall adapter – routed through a TP5100 module – once the pack reaches 8.4 V, then reconnects it when the voltage falls back to roughly 7.2 V.

The heart of the design will be a voltage-comparator stage. I’m fine with the classic LM393, but you may choose any pin-compatible or better device if it improves accuracy or power draw. The switching element can likewise be an N-MOSFET, P-MOSFET, or even a compact relay; I mainly care about low losses, no back-feeding into the adapter, and rock-solid hysteresis between OFF (8.4 V) and ON (≈7.2 V).

What I need from you
• Complete schematic with all part values and reference designators
• Simulation or verification files (LTspice, Proteus, Altium, KiCad, or similar) showing the turn-off/turn-on thresholds and no-oscillation behavior
• Brief design note explaining how the hysteresis network, switching device, and protection components work together
• A bill of materials that I can hand straight to a distributor

If you can deliver a design that is compact, reliable, and ready for quick PCB layout, let’s get started.