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MC33063A: work in LDO mode

Part Number: MC33063A

Hi team,

Does this device able to work at LDO mode in some certain conditions? 

I ask because my customer is using this device for 12V to 5V conversion, in their previous design they didn't use the diode, and it works well. I begin to suspect the device is working at LDO mode. 

Or what could be the problem?