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LMR10515: Very light load conditions

Part Number: LMR10515
Other Parts Discussed in Thread: LM10515

Team,

I have a customer that is trying to use a LMR10515 in the following configuration:

Vin: 5V

Vout: 1.8V

Iout: 30mA. 

The efficiency looks terrible here (~60% and high slope), but apart from that, are there any additional causes for concern? The customer has communicated they aren't terribly concerned about the efficiency given the small draw on the part, but are using multiples of these in the design for other rails and wish to keep the BOM simplified.