POWER MANAGEMENT DEVICE AND METHOD THEREOF
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United States of America Patent
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Issued Date -
Jun 21, 2012
app pub date -
Dec 15, 2011
filing date -
Dec 16, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A power management device of an SD memory card reader includes a power supply regulator and a controller. The controller controls the power supply regulator to provide a memory card voltage according to an external control signal transmitted from a single control pin. Wherein when the external control signal denotes an enable state, the power supply regulator provides the memory card voltage; when the external control signal denotes a disable state, the power supply regulator stops providing the memory card voltage and discharges the load capacitor; and when the external control signal returns to the enable state from the disable state in a predetermined duration, the power supply regulator changes the memory card voltage.
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