With MCP73831 you´ll charge lithium cells easily and safely

And it can be added that also simply and cheaply. MCP73831 from company Microchip is „all-in-one“ solution for charging a single Li-ion/Li-Po cell.
This is an archive article published 04/17/2015. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

Li-Ion a Li-Polymer cells are becoming a No.1 choice for many applications, where they persuade by high energy density, low weight, low self-discharge and for majority of applications also by their favorable flat shape (Li-Po). Their price is also affordable (in regard to their properties) and so there´s usually only one “difficulty” - to solve charging, or more exactly - overall management of these cells. Basic principles were highlighted to you in our article "Try the most favourite types of batteries". To reach a maximum cell lifetime, it´s also advisable to use initial (preconditioning) slow charging and also important is a proper charging termination as well as repeated recharging after reaching a certain degree of discharge.

It´s obvious, that to construct such a circuit from discrete components would be possible, but impractical, bulky and expensive. That´s why there are various charging controllers on the market and in many cases a single chip solution is an ideal solution. This is also a case of MCP73831 chip - a fully integrated linear charging controller. If you use only a single cell and maximum charging current of 500mA is sufficient for you, then MCP73831 will meet all requirements for a quality and safe recharging solution. MCP73831 has integrated output (FET) transistor, current sensing and reverse discharge protection.

With MCP73831 you´ll charge lithium cells easily and safely
Charging current can be easily adjusted by a single resistor, what´s also associated with other parameters like preconditioning current and charging termination. MCP73831 also contains a thermal regulation, which decreases output current in case of increased chip temperature (for example because of higher ambient temperature).

MCP7383x is available in four versions with factory-set regulation (max. charging) voltage. In our store can be found “the safest” first version with 4.20V regulation voltage - MCP73831T-2ATI/OT. In datasheet (p. 25) we can also read that this is the “AT“ version, which starts repeated charging at 94% Vreg (i.e. at approx. 3.95V), in a SOT23-5 package. Supply voltage can be in a range of 3.75-6V, while in respect to a thermal stress of a chip it´s better to supply it by a voltage close to max. output voltage (4,20V).

The chip can be easily supplied by a standard 5V voltage, but in cases of increased risk of overheating (operation at higher ambient temperatures, densely populated PCB,...), a common Si diode in series can be helpful. This will decrease supply voltage in 0.6-0.7V (and takes a portion of thermal loss on itself).
Charging status can be found at the "Charge status output" pin, which can drive an indication LED or can be connected to a host microcontroller.

In case of interest in any Microchip component, please contact us at info@soselectronic.com.

Advantages/ Features:

  • fully integrated linear charge management controller for Li-ion/Li-Po cells
  • integrated output power transistor
  • adjustable charging current - 15...500 mA
  • available in several versions
  • low power consumption
  • automatic power down and repeated recharging
  • thermal regulation
  • industrial range of operating temperatures -40..+85°C
  • miniature SOT-23-5 package

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