Circuit and method combining a switching regulator with one or more low-drop-out linear voltage regulators for improved efficiency
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United States of America Patent
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Feb 3, 2009
Grant Date -
Nov 30, 2006
app pub date -
May 25, 2006
filing date -
May 25, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Various embodiments provide a system comprising a regulator and one or more low-drop-out linear regulators for improved efficiency. In one embodiment, a system comprises a regulator and one low-drop-out linear regulator comprising a pass transistor, and furthermore, another transistor matched to the pass transistor except for size. The matching transistor provides information regarding the source-drain voltage drop of the pass transistor. A controller circuit makes use of this information to set the regulator's output voltage to improve the efficiency of the system. Other embodiments are described and claimed.
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