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TPS54240: TPS54240 of efficiency when low consumption

Part Number: TPS54240
Other Parts Discussed in Thread: TPS5420, LMR33620

Dear Technical support

We have a plan to choice TPS5420 as much as possible.

However, efficency is about 40% when low consumption.

(In our evaluation, test result is that Vin=12V , I in=10mA, Vout=5V and  Iout=10mA)

It is important for us that efficiency is high when low input current.

So would you please tell us how to improve efficiency?

BR

Junya Matsumoto.