The first is the desire for more performance. Today’s electronics have processing power in orders of magnitude more than their predecessors just since the early part of the millennium! The second is the desire for even smaller form factors.
Historically, temperature has been used to manage the thermal protection of these systems. In many systems today, rather than measuring the lagging indicator (temperature), current (or the power which is the voltage times the current) is being measured, which is a leading indicator for thermal increase.
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