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Charge Management Controller problem

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hakraf

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Hi,
I have designed a battery charging circuit with MCP73831 chip, after testing it for about 4h i ended with a swollen battery, this is the circuit i used
Untitled.png
the battery i'am using is 3.7v, 200mAh
45e380b9-05d3-4987-9a3b-64130b998cf2.jpg
the VDD is 4.8v, could anyone help me to found the problem ?
Thanks.
 

FvM

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Which MCP73831-X variant are you using? Does the selected Vreg fit the battery specification?
 

hakraf

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i'm using MCP73831-2, i mesured the output voltage and it is 4.2v
 

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