The 6.4 V max supply voltage covers the USB 5 V rail with margin, but anything above that — a miswired adapter or a hot-plug transient — hits the over-voltage protection before it reaches the battery.
Charge current, protection, and programmability
Charge current is constant and programmable via an external resistor — set it at the BOM level, not in firmware. The programmable timer gives a safety timeout if the battery never reaches the 4.2 V termination voltage. Fault protection covers over-temperature, over-voltage, reverse-current, and short-circuit — four separate monitors that each can shut down the charger independently. If you are comparing against a charger that lacks reverse-current protection, the BQ24075RGTT blocks battery discharge back into the USB port when the bus is unpowered — that matters for designs where the battery stays connected while the charger input floats.
Lifecycle, compliance, and sourcing posture
No end-of-life notice or PCN on the public record. The base product number BQ24075 covers a family of pin-compatible variants with different charge voltages and timer options — if your BOM calls for the RGTT suffix (VQFN-16, tape-and-reel), confirm the exact charge voltage and timer settings match the original design.