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TPS82085: switching frequency for low dropout

Part Number: TPS82085

Hi there,

My customer used TPS82085 to convert 3.3Vin to 2.8V. They found two units' switching frequency is only 990kHz, even they had increased the output current to 1.5A.

In another 5Vin to 3.3V design, the fsw is 2.9MHz. 

I would like to know what makes the fsw changed. Thanks.