Project Analog - December 2007 - (Page 5)

charging Lithium-ion batteries: system considerations By Scott Dearborn Microchip Technology / Chandler, AZ / www.microchip.com IntroductIon 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 through: maximize battery capacity usage. This theme directly relates to how energy is properly restored to rechargeable batteries. An understanding of the charging characteristics of the battery and the application’s requirements is essential in order to design an appropriate and reliable 5 · prOject AnALOg · Dec 07 mcP73861 Contents Viewpoint Charging lithium-ion batteries New trends in battery-powered portable devices Low power design: LDO thermal considerations Analog news battery charging system. This article explores some of the key system considerations when designing a battery charging circuit. LI-Ion chargIng— SyStem conSIderatIonS A high-performance charging system is required to recharge any battery quickly and reliably. The following system parameters should be considered in order to ensure a reliable, cost-effective solution. Input Source Many applications use very inexpensive wall cubes for the input supply. The output voltage is highly dependent on the AC input voltage and the The MCP73861 is an advanced singlecell Li-ion battery charge management controller featuring up to a 1.2A highpower rapid-charge current. The ±0.5% output voltage regulation accuracy ensures your battery is fully charged. Other battery chargers only have a ±1.0% accuracy, which can undercharge your battery nearly 10%. The MCP73861 boasts multiple advanced capabilities and safety features – preconditioning, automatic end-of-charge control, thermal regulation, safety charge timers, automatic power-down, cell temperature monitoring, and charge status outputs. Output voltage options include 4.1V or 4.2V to support both coke and graphite anodes. click here for more information on the MCP73861. Microchip analog page Battery charger overview Sample center microchipDIRECT Reference designs/ app notes Technical training http://www.microchip.com http://www.microchip.com http://www.microchip.com/analog http://www.microchip.com/analog http://www.microchip.com/batterychargers http://www.microchip.com/batterychargers http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en020210 http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

Table of Contents Feed for the Digital Edition of Project Analog - December 2007

Project Analog - December 2007 Contents Viewpoint About Project Analog Sponsor4 Charging Lithium-Ion Batteries: System Considerations New Trends In Battery-Powered Portable Devices Low Power Design: LDO Thermal Considerations Runtime Measurements for a Hybrid Power Source Battery-Powered System Design Considerations Analog News—Analog News from Multiple Sources Enter to Win an iPhone Contact Project Analog Sponsor Mindi™ Battery & Power Circuit Simulator Microchip Advanced Parts Selector (MAPS)

Project Analog - December 2007

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