Soft-Start Circuit Based on Switched-Capacitor for DC-DC Switching Regulator

Zhenpeng BIAN  Ruohe YAO  Fei LUO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.10   pp.1692-1694
Publication Date: 2012/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1692
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Circuits
Keyword: 
soft-start,  DC-DC switching regulator,  switched-capacitor,  inrush current,  overshoot voltage,  

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Summary: 
An on-chip soft-start circuit based on a switched-capacitor for DC-DC switching regulator is presented. A ramp-voltage, which is generated by a switched-capacitor, is used to make pulse width slowly increase from zero, in order to eliminate the inrush current and the overshoot voltage during start-up. The post simulation results show that the regulator soft starts well with the proposed soft-start circuit.