High operating/quiescent current from buck converters?

[newto]

Hello all!

I'm having a smallish issue with the buck converters on my board, they're drawing a lot more operating/quiescent current than the specs sheet say they should be.

I'm using two https://www.ti.com/lit/ds/symlink/tps562207s.pdf Buck converters to get 3.3V and 5V off two lithium cells. Since this is a prototype, the only stuff soldered on the board so far is the power converters (there are two more connected to the 3.3V) and the battery management. Unfortunate copy paste error, the R52 on the +5 rail should be 52.3k instead of 31k, at the moment they both make 3.3V. So if I say "5V" in this post, it's only outputting 3.3V

Issue I'm running into is that with only a few chips and no actual loads, the board is consuming much more current than expected. With both chips enabled I draw about 24mA with some load on the 3.3V rail from an inefficient boost converter.

The "5V" rail has no load and the 3.3V chip disabled, the board draws 11mA at 6.6V.

If I attach a 33R resistor as a dummy load to the "5V" rail, it draws 64mA at 6.6V.

If I remove the EN resistors on both chips, the board draws ~0mA, so it's not caused by anything else on the board.

Also, if I increase the voltage to 8.4V with only the 5V and no load, the current goes up to 14mA, and with the load, the current goes to 54mA.

So if I interpret this right, the chips should use less than 1mA each, even in the worst case, but they're draining 11mA+, and that amount increases with input voltage?

Am I missing something with Buck converters, or have I done something horribly wrong? For a prototype, this isn't too concerning, but that eats up a lot of my power budget from the batteries