Battery Charger (MCP73844) - Overheating of p-MOSFET

Here are some suggested steps you can use to check why the p-MOSFET is overheating in the battery charging circuit:

  1. Calculate the power dissipation in the transistor. Calculation examples and formulas are provided in Section 6 of the device datasheet, which can be found on the product landing page.
  2. The higher the value of RDSON, the more power is dissipated causing your MOSFET to heat up. The aim is to have a RDSON value as minimum as possible.
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