Digitally controlled integrated pseudo-CCM SIMO converter with adaptive freewheel current modulation

In this paper, a digitally controlled integrated single-inductor multiple-output (SIMO) converter operating in pseudo-CCM (PCCM) mode is presented. With an adaptive freewheel current modulation (AFCM) technique, conduction loss of the freewheel switch is significantly reduced in unbalanced load conditions. Moreover, cross-regulation and switching noise are both effectively restricted. A prototype of a single-inductor dual-output (SIDO) boost converter was designed with a 130-nm CMOS process. The two outputs are regulated at 2.5 V and 1.8 V respectively, at a switching frequency of 500 KHz. The simulation results indicate that the expectant specifications are well implemented.

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