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  • Li-Ion/Li-Poly Battery Charge and System Load Sharing Management

  • Created: May 16, 2016

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This reference design stresses the importance of battery chargers especially that most devices require recharging. This device can effectively recharge Li-Ion/Li-Poly batteries, which are widely used in today’s portable consumer electronics. It is a simple system load sharing and battery management system with Microchip’s popular MCP73871 for cost-sensitive applications. This management allows seamless switching between system load and charge current in different conditions. In addition, it offers an independent charge current setting through resistors and preset logic inputs.

The device is a fully integrated linear solution for system load sharing and Li-Ion/Li-Polymer battery charge management, with AC-DC wall adapter and USB port power sources selections. It is capable of autonomous power source selection between input and battery. Along with its small physical size, the low number of required external components makes the device ideally suited for portable applications. The MCP73871 device automatically obtains power for the system load from a single-cell Li-Ion battery or an input power source, which is AC-DC wall adapter or USB port. In addition, this device specifically adheres to the current draw limits governed by the USB specification. While an AC-DC wall adapter provides power to the system, an external resistor sets the magnitude of 1A maximum charge current that supports up to 1.8A total current for the system load and battery charge current.

This design is applicable to system that requires an average of 100 mA load current and consumes a maximum of 500mA peak current for a short duration of time. It can also be used as a typical application of a smart phone, PDA, portable media players, MP3 players, digital camera, handheld medical devices, Bluetooth headsets, ultra-mobile PC and portable transmitters.



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