From Technologic Systems Manuals

The TS-8551 does not have any on-board power regulation / output other than the main power input regulation circuit. Therefore, only 5 VDC is provided to the SoM, USB, internal devices to the TS-8551, and other 5 VDC pins.

Rail Current Source Location
5 VDC 1000 mA CN1_15, CN1_16, CN1_29, CN1_47, USB Host port