Voltage‐mode hysteretic control techniques for high‐current single‐inductor multiple‐output switching regulators

In this Letter, two comparator‐based voltage‐mode hysteretic controller designs are proposed to enhance dynamic response for single‐inductor multiple‐output (SIMO) switching converters to minimise over‐/under‐shoot voltages due to self‐ and cross‐regulations in fast load transients, especially with high output power and large current steps. The proposed converters are designed and simulated in a 65 nm CMOS process with standard I/O devices. With the proposed techniques, the output voltage fluctuations, including steady‐state voltage ripples and over‐/under‐shoot voltages due to self‐ and cross‐regulations during a 1.8 A load transient in 1 ns, are kept within 60 mV. The proposed converter delivers more than 3 A maximum load current per output and a maximum total output power above 6 W, with a peak efficiency above 90%. Compared to state‐of‐the‐art SIMO converters, this work achieves a significantly higher output power capacity and faster dynamic response thus smaller self‐ and cross‐regulations within 0.033 mV/mA.