Microchip’s Li-ion battery charger MCP73831 IC



Microchip’s Li-ion battery charger MCP73831 IC


Microchip announced the expansion of its analog power-management family with the MCP73831 battery charger, a fully-integrated, single-cell, Li-ion/Li-Polymer charge-management controller.

Tiny 500mA linear charge management controller can be powered directly from the USB port. Includes integrated 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 per cent to 0.75 per cent) results in more fully charged batteries and extended battery life.

Since the MCP73831 charge-management controller includes a pass transistor, current sense and reverse-discharge protection on a single chip, it reduces the number of system components needed for battery-charger designs, which, added Microchip, lowers overall system costs.



High accuracy preset output voltage regulation (+/-0.75%)

Output voltage options include 4.2V, 4.35V, 4.4V and 4.5V

User-programmable charge current

Charge status output can directly drive LEDs

On-chip thermal regulation

Preconditioning and end-of-charge ratio options

Under-voltage lockout

The integrated charger provides highly accurate output-voltage regulation, with a maximum accuracy of 0.5 per cent to 0.75 per cent, resulting in more effectively charged batteries with longer life. Its 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, preventing damage to the chip. Furthermore, the MCP73831’s charge current is user-programmable, enabling designers to customize charging currents for specific applications.

“The MCP73831 charge management controller offers the best combination of features, output-voltage regulation, and thermally-efficient packaging on the market for small, Li-ion and Li-Polymer-powered applications,” said Keith Pazul, marketing manager with Microchip’s analog and interface products division. “This new charger supports market trends toward consumer devices that deliver higher performance and longer battery life in miniature packages.”

Another key feature of the MCP73831 charger is its simple status output pin that directly drives single or multi-colour LEDs. The charger also supports multiple regulation voltage outputs, making it an effective charging solution for many types of Li-ion battery technologies. The MCP73831 is designed for battery-powered consumer applications requiring small size and thermal regulation, such as wireless headsets, MP3 players and digital cameras.

The MCP73831 is offered in 5-pin SOT-23 package and in the thermally enhanced, 2-by-3mm, 8-pin DFN package. This device is already available for sampling and volume production.



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