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Li-Ion/Li-Polymer battery charger

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MICROCHIP Technology has expanded its analogue power-management family with the MCP73831 battery charger - a fully-integrated, single-cell, Li-Ion/Li-Polymer charge-management controller.

Equipped with a pass transistor, current sense and reverse-discharge protection, the MCP73831 charger reduces the number of components needed for battery-charger designs.

Its highly accurate, pre-set voltage regulation (maximum accuracy 0.5% to 0.75%) results in more fully charged batteries and extended battery life.

The device's SOT-23 5-pin and miniature 2mm x 3mm 8-pin, thermally enhanced DFN packages enable smaller, smarter charger designs for a wide variety of portable consumer devices such as wireless Bluetooth headsets, MP3 players and digital cameras.

The charger’s thermally efficient DFN package option allows high charging currents of up to 500mA for faster charging.

The controller also features on-chip thermal regulation that decreases charge current when temperatures become too hot, thus preventing damage to the integrated circuit.

The MCP73831's charge current is user-programmable, enabling designers to customise charging currents for specific applications.

Another key feature of the MCP73831 charger is its simple status output pin that directly drives single or multi-colour light-emitting diodes (LEDs).

The charger also supports multiple regulation voltage outputs, making it an effective charging solution for many types of Li-Ion battery technologies.

Microchip offers the MCP73831EV Evaluation Board to support the development of battery charger applications using the MCP73831 charger.

The board is available on 1 December 2005 at http://buy.microchip.com/.

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