Monolithic battery charging device
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United States of America Patent
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Sep 14, 2004
Grant Date -
May 15, 2003
app pub date -
Nov 5, 2002
filing date -
Nov 5, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A monolithically formed battery charger may be fabricated as an integral part of a multifunctional integrated circuit or as independent monolithically formed integrated circuit. The monolithically formed battery charger includes at least one step-down converter having a given duty ratio coupled to a battery-terminal interface that provides a stepped-down output voltage and current that may be used to charge a rechargeable battery. The step-down converter includes one or more cascaded monolithically-formed synchronous-buck regulators operating at a frequency of at least one megahertz. Each regulator may include a capacitor, inductor, controller, switch, and rectifier. When cascaded, the high-side output node of a preceding synchronous-buck regulator is connected to the switch in a successive synchronous-buck regulator.
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