Fully integrated switched‐inductor switched‐capacitor dual‐path DC–DC converter

Abstract

A fully integrated switched-inductor switched-capacitor (SISC) DC-DC converter is proposed. This converter is designed in such a way that the input voltage can be twice the process allowable voltage without damaging the on-chip transistors. To mitigate large series resistance of on-chip inductors as one of the main challenges in the switched-inductor power supply on chip, two solutions are proposed. By using analytical model of an on-chip inductor, optimal physical dimensions are designed to achieve the desired inductance with minimum series resistance in a small area. Along with the optimization, the dualpath structure of the proposed converter reduces series resistance losses of the on-chip inductor and increases the effective quality factor up to 7 times in duty cycle of 0.8. The proposed converter is implemented in 0.18 μm standard CMOS process. The circuit converts input voltage of 3.6-0.9 V at the load current of 125 mA with the efficiency of 72.8%. Efficiency enhancement factor reaches 72% at 600 mV output voltage. The achieved current density of the proposed converter is 333 mA/mm 2 . By calculating small signal model of the proposed converter and designing a suitable feedback loop, an appropriate transient behavior was provedcascode buck converter, fully integrated voltage regulator, high current density, high stepdown, inductor quality factor boosting, on-chip inductor optimum design

Evaluation, design, and test of single switch high step‐up boost converter with autotransformer

“…In a lossless ideal transformer, as shown in Figure 1B, where the input power can be considered equal to the output power (1). All the energy delivered to the output is magnetically processed by the core, changing the voltage and current levels depending on the turns-ratio of the transformer N 2 /N 1 (2).…”

“…Thus, to supply power to these systems, a high voltage gain converter is needed. 2,3 Among the step-up converters found in the literature, the standard boost converter stands out. This converter presents a simplicity of operation, has a low number of components.…”

“…Solar panels provide a low voltage level (<50 V) compared to grid (220 V rms ) or a DC nanogrid bus (400 V). Thus, to supply power to these systems, a high voltage gain converter is needed 2,3 . Among the step‐up converters found in the literature, the standard boost converter stands out.…”