TPS923650: Buck-Boost current flow

Part Number: TPS923650

Tool/software:

Hello team,

I am going to use TPS923650D1 for LCD backlight driving with 0.1A LED current.

I have 12V - 14V voltage input and 10.8V - 13.2V forward voltage for LEDs. So I need a buck-boost solution for the driver.

But I do not understand how does the current flow in buck-boost connection? 

It starts from VIN -> Inductor -> Diode -> VOUT -> LED Anode -> LED Cathode -> VIN -> ??? -> GND

How does it come from VIN to GND?

Best regards,

Vladislav