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TPS548D22: TPS548D22 switching frequency

Part Number: TPS548D22

I set the switching frequency at 650 KHz for TPS548D22 and found out that the maximum load current is merely 574KHz, which is way below 

the datasheet definition. Is this normal?

Vin 12V

Vout 3.3V 

Iout 31.38A