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Design a load sharing system power path management with Microchip's stand-alone Li-ion battery charger

Posted: 11 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion battery? battery charger? consumer electronics?

Batteries often serve as the main energy source for portable electronic devices. Although they depend on batteries, portable consumer electronic products, such as GPS and multimedia players, often consume energy directly from AC/DC wall adapter or accessory power adapter (or "Auto Adapter") when the battery is low or the device is in a stationary mode.

Relatively high energy density and maintenance free make Li-ion batteries popular in the portable consumer electronic products. Li-Ion batteries are the example of the portable power source in this applications note.

Depending on the product design or local government regulations, rechargeable batteries are often charged inside the handheld devices or from battery charger cradles. Due to the safety concerns or design concepts in some products, the batteries are required to be removed from the portable device and charge directly from the battery charger cradle.

However, most of time, batteries are designed to be recharged inside the devices while the devices are still in the operational mode. An end-user can extend run time while refilling the energy back to the battery for the next mobile action. The adapter now has to power up the device while charging the battery. The battery can deliver energy to the system load when the power source is absent.

Portable electronic devices play an important role in a person's daily life from grocery shopping to personal data assistant and have dramatically changed the way people live and work. With the emerging technologies that are available today, portable electronic designers are trying to integrate more features into smaller and lighter form-factors while extending the system run times.

This application note is intended to assist product designers by taking advantage of using Microchip's fully integrated simple Li-Ion battery charge management controllers with common directional control to build a system and battery load sharing circuitry.

View the PDF document for more information.

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