A novel device structure for MBDS with intrinsically integrated free-wheeling diodes is introduced to improve the single-gate self-control characteristic for unidirectional current conduction. The MBDS is realized as a large-area device with an on-resistance of 178 mΩ in a GaN power IC, which includes additional peripherals such as two integrated gate drivers, current sense-FET, temperature sensor, and substrate network to avoid back-gate effects. The GaN power IC is fabricated in a GaN-on-X_ISO technology and offers an advanced power device for various topologies.