Batteries often serve as the main energy source for portable electronic
devices. Although they depend on batteries, portable consumer electronic
products, such as GPS devices and multi-media players, often consume
energy directly from an ac-dc wall adapter or accessory power adapter
(or “Auto Adapter”) when the battery is low or the device is in a
stationary mode. Due to their cost effectiveness over their useful life,
rechargeable batteries are often used for the power source of the
portable electronic device.
Attributes such as “relatively high energy density” and “maintenance
free” make Lithium-Ion (Li-Ion) batteries popular in the portable
consumer electronic products. Refer to the application note, AN1088,
“Selecting the Right Battery System For cost Sensitive Portable
Applications While maintaining Excellent Quality” (DS01088) for
characteristics of Li-Ion batteries. Some examples of how to properly
design with Li-Ion batteries will be discussed in this application note.
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