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Powering USB Host Shield by nRF52840DK pca10056

Dear Nordic Semi, ladies and gentlemen!

I'm working on a prototype device with USB host functionality. I am using Arduino USB Host Shield connected to nRF52840 DK. DK is connected and powered via J2 USB (MCU) connector. USB Host seems to be powered, and even provides power to the mouse, if plugged in.

But shield internal oscillator doesn't start, even if nothing is plugged in. I guess there's not enough power for that. Shield' operating voltage is 5V, 400/500 mA. It has no power jack and is powered only when attached to an Arduino board.

So the question is: what are my options to provide enough power to this shield to verify if its internal oscillator starts?

Many thanks.

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