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Power Management in Portable Applications: Charging Lithium-Ion/Lithium-Polymer Batteries

From Microchip Technology, Inc.
 

 
Powering today's portable world poses many challenges for system designers. The use of batteries as a prime power source is on the rise. As a result, a burden has been placed on the system designer to create sophisticated systems utilizing the battery's full potential. Each application is unique, but one common theme rings true: maximize battery capacity usage. This theme directly relates to how energy is properly restored to rechargeable batteries. While no single method is ideal for all battery chemistries, an understanding of the charging characteristics of the battery, along with the application's requirements, is essential when designing an appropriate and reliable battery-charging system. Each method has its associated advantages and disadvantages, with the particular application (and its individual requirements) determining the best method to use. This application note focuses on the fundamentals of charging Lithium-Ion/Lithium-Polymer batteries. In particular, a linear, stand-alone solution utilizing Microchip's MCP73841 will be explored.
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