An 83% peak efficiency and 1.07W/mm² power density Single Inductor 4-Output DC-DC converter with Bang-Bang Zero^th-Order Control

Abstract

This paper presents a new control scheme dubbed Bang-Bang Zero th -Order Control (BBZOC) for Single Inductor Multiple Output (SIMO) buck converter. The main loop control utilizes a phase detector, charge pump, filter, and comparator. The SIMO buck converter with BBZOC simplifies the compensation design compared to conventional voltage mode control. This work is fabricated in 1P4M 0.35um BCD process and achieves 83% maximum efficiency with the rated output power of 1.04W. The maximum output power is 2.7W and the maximum power density is 1.07 W/mm 2 . Considering the difference in the process, this work represents the state of the art in the power density.

An Adaptively Controlled 10-Output Reconfigurable Dual-Bus SIMO System With Group Allocator for Diversified Load Condition

“…More specifically, the discontinuous current flow of the SIMO converter generates switching noise (V SWN ) from the parasitic inductance in output [11], [18]- [20]. It affects the operation of the comparator directly and causes chaotic operation when there is a very light-load output because the output ripple voltage becomes smaller compared to that of the switching noise [16], [18]. In other words, the ACBC becomes sensitive to the switching noise at light-load output.…”

“…To resolve the problems occurring with light-load outputs in an ACBC, a pulse skip mode can be inserted [18]. However, when the number of the light-load output increased, it can cause stability issues due to chaotic sequence powering.…”

Multi Loop Controllers for Single Inductor Multiple Output Dc-Dc Buck Converters: A Comparative Study

“…To achieve the good regulation performance over wide load and voltage ranges with fewer ripples, the Relative Skip Energy Control (RSEC) [13] is used to make the converter to work in either Continuous Conduction Mode or Green Mode. Bang-Bang Zeroth-Order Control [14], Adaptive Gate Biasing [15], Output Independent Gate Drive Control [16] and ErrorBased Controller [17] are developed for the SIMO DC-DC converter to obtain the high efficiency, compact area and less ripples. However, the above methods are not using any specific linear and nonlinear controller and these algorithms are again complex and need extra circuits.…”