Discussion
A part specified for a 1.8 V to 3.6 V supply is to run from a single lithium cell falling to 2.7 V. The supply is
Answer: C
A cell falling from 4.2 V to 2.7 V stays inside a 1.8 to 3.6 V window for most of its discharge, though the top of a freshly charged cell exceeds it and needs attention. Running direct from the cell over the remainder saves a regulator and its quiescent current.
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