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TPS54233: Issue while working with EC25 4G module

Part Number: TPS54233

Hello All,

    We are using TPS54233 buck converter in my design. I am facing issue is output voltage is getting fall down when my wireless module during transmission. Actually my design input voltage is 12V and output is 4.2V burst current is up to 2A, output voltage getting down to 3.6V and input voltage getting down to 9V. Find attachment of my design schematic and data sheet of wireless module,Please suggest.

Regards,

Nilesh Kulkarni