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A New Approach to Reducing Output Ripple in Switched-Capacitor-Based Step-Down DC–DC Converters

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3 Author(s)
Jifeng Han ; Freescale Semicond. Inc., Ridgeland, MS ; von Jouanne, A. ; Temes, G.C.

Rapidly dropping power supply voltages and tight voltage regulation requirements for integrated circuits challenges power supply designers. A novel interleaved discharging (ID) approach is presented to reduce the output ripple in step-down switched-capacitor (SC) dc-dc converters. Simulation and experimental results of a four-stage SC dc-dc converter show that the ID approach can reduce the output ripple by a factor of three. The proposed approach also improves the converter efficiency by 7%. The ID method provides flexibility in the design optimization of step-down SC dc-dc converters

Published in:

Power Electronics, IEEE Transactions on  (Volume:21 ,  Issue: 6 )