Linear voltage regulator with selectable light and heavy load paths
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United States of America Patent
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Sep 12, 2006
Grant Date -
Aug 3, 2006
app pub date -
Feb 3, 2005
filing date -
Feb 3, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light-load power transistor and a heavy-load power transistor are connected in parallel between an input voltage and an output voltage. The light-load power transistor has a smaller current driving capability, i.e. a smaller dimension of a current path. During a light-load mode, only is the light-load power transistor activated to reduce the current consumption caused by an error amplifier, thereby enhancing the efficiency. When a detection current signal is higher than a threshold current signal, the heavy-load power transistor is additionally activated through a gate control circuit by a mode selection circuit, thereby achieving a sufficient current driving capability.
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