Load-Balance-Independent High Efficiency Single-Inductor Multiple-Output (SIMO) DC-DC Converters

Abstract

Abstract-A single-inductor multiple-output (SIMO) DC-DC converter providing buck and boost outputs with a new switching sequence is presented. In the proposed switching sequence, which does not require any additional blocks, input energy is delivered to outputs continuously by flowing current through the inductor, which leads to high conversion efficiency regardless of the balance between the buck and boost output loads. Furthermore, instead of multiple output loop compensation, only the freewheeling current feedback loop is compensated, which minimizes the number of off-chip components and nullifies the need for the equivalent series resistance (ESR) of the output capacitor for loop compensation. Therefore, power conversion efficiency and output voltage ripples can be improved and minimized, respectively. Implemented in a 0.35-m CMOS, the proposed SIMO DC-DC converter achieves high conversion efficiency regardless of the load balance between the two outputs with maximum efficiency reaching up to 82% under heavy loads.

Single Inductor-Multiple Output DPWM DC-DC Boost Converter with a High Efficiency and Small Area

“…Due to advancement of circuit technology, the research area of the single-output concept has become saturated; however, several pieces of research have been completed in the area of analog-controller SIMO DC-DC converters as well. Also, system stability, poor cross regulation and flexibility are the main issues of SIMO converters to achieve excellent performance [2][3][4][5][6]. Studies of the digital-controller converters can be found in [7,8], while the field-programmable gate array (FPGA), microcontrollers, and compact reconfigurable input output (cRIO) play key roles in the operation of the corresponding digital controller.…”