A 1A, 20MHz/100MHz dual-inductor 4-output buck converter with fully-integrated bond-wire-based output filters for ripple reduction

A Dual-Frequency Dual-Inductor Multiple-Output (DF-DIMO) buck converter is presented. The 2-phase input stage is switching at 20 MHz and employs two 200-nH inductors, while the output stage is switching at 100 MHz and generates 4, 250-mA outputs. The output capacitors are all fully integrated, and additional bond-wire-based filters are employed at each output for voltage ripple reduction. The proposed design is implemented in standard 65-nm CMOS technology. It achieves less than 40-mV voltage ripple, 0.5-V/60-ns Dynamic Voltage Scaling (DVS), and settling time of less than 80 ns for a 125-mA load step; all with no observable cross regulation transients.