Single-Inductor Dual-Output DC-DC Buck/Boost Converter

A Single-Inductor Dual-Output (SIDO) DC to DC Buck/Boost Converter topology is proposed. The power stage switching sequence is different from conventional type. In addition to three switches, a freewheel switch is used to prevent negative inductor current occurring and degrading the power efficiency. The converter uses ripple-based control method, which facilitates high switching frequency and decreasing the passive components volume. The chip is fabricated in 0.18 μm CMOS, the proposed SIDO DC-DC Buck/Boost Converter can produce 0.95 V buck voltage with 1.4 V boost voltage. The power transfer efficiency could reach 80% in simulation.