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quiescent current which ensures for the internal circuitry to work properly depends on the ambient temperature.

This statement seems to get the relationship between quiescent current and the operation of internal circuitry backwards.

Quiescent current doesn’t power the internal circuitry. Quiescent current is a measure of current consumed by the internal circuitry while it’s idle.

The temperature relationship exists because the circuitry consumes more power when it hot. But there isn’t some temperature dependent magically quiescent current provider that must work correctly for the rest of circuitry to operate. Just like there isn’t a “standby power provider” inside of a TV to allow it to remain in standby. The standby power is just a measure of the power consumed while in standby.

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