Make sure the SMAJ58 TVS and 0.1uF cap are very close to TPS23xxx (or LM50xx per post title) Vdd and Vss pins and are connected with low inductance copper.
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Make sure the SMAJ58 TVS and 0.1uF cap are very close to TPS23xxx (or LM50xx per post title) Vdd and Vss pins and are connected with low inductance copper.