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TPS564201: Voltage Drop

Part Number: TPS564201


I am using TPS564201 IC. Input: 12V, Output: 5V. It's said in the datasheet, I'm using a 3.3uH coil. Model number of the coil SRP7050AA-3R3M.

When I load 1A from the 5V, there is a voltage drop of 0.5V. (output voltage 4.5~4.6V)

What is the reason?