New charger topology maximizes battery charging speed
Fran Hoffart
Abstract
The LT1511, a high efficiency 200kHz switching regulator IC in a step-down configuration suitable for charging lithium-ion batteries, is described.
Keywords
Lithium-ion battery
battery charger
LT1511
Introduction
Battery charging in notebook computers and other portable products generally involves compromises. A notebook computer’s AC adapter is usually sized to charge the battery at its maximum rate when the computer is off. In this condition, the computer draws essentially no power, so the full capacity of the adapter can be used for charging the battery. However, when the computer is turned on, charging current is usually reduced to a low rate ...
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