Single inductor dual output dc-dc converter for space-limited or large input voltage variation systems

The design of a Single Inductor Dual Output (SIDO) buck converter using two individual voltage mode control loops has been presented in this paper, and the limitation of using such control method has been indicated, then the control schemes for minimizing the cross regulation issue has been discussed. By using two separate control loops, the inductor energy is shared and regulated for both output rails. The bench test results show that both outputs of the proposed scheme can achieve good regulation in steady state, and the auxiliary output rail can also obtain good line regulation. The proposed structure is a promising candidate for space-limited applications or for large input voltage variation systems. Furthermore, by using current mode control on the auxiliary output rail, the load cross regulation issue can be reduced.