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Question on Inductor choice on a Switched Converter

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I was designing a buck converter using either LM2575 and MC34063. BOth a 12V input and a 5V output .. 0.3Amax current. For the Lm i was folloing the datasheet and for MC i was using ON semi AN920. On both minimum Indutance is bigger for smaller max current. Why? I mean. If i chose a inducor for a 300mA current, if it sinks 50mA, it is suposed to work no? So why if i deisgne it for 50mA i am suposed to use Inductor with bigger inuctance (more expensive)?

Thank you!
 

Inductor will decide the inductor current ripple. If the inductance is increased, the current ripple will be reduced.
 

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