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A CMOS Low Dropout Regulator with Extended Stable Region for the Effective Series Resistance of the Output Capacitor
Hsuan-I PAN Chern-Lin CHEN
IEICE TRANSACTIONS on Electronics
Publication Date: 2008/08/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
CMOS analog integrated circuits, stability, compensation, low-dropout regulator,
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In this paper, a new compensation scheme and a corresponding pass element structure for a CMOS low-dropout regulator (LDO) are presented. The proposed approach effectively alleviates the strict stability constraint on the ESR of the output capacitor. Stability of a CMOS LDO with the conventional compensation requires the effective series resistance (ESR) of the output capacitor in a tunnel-like region. With the proposed design approach, an LDO can be stable using an output capacitor without ESR. A 2.5 V/150 mA LDO has been implemented using a 0.5-µm 1P2M CMOS process. The experimental results illustrate that the proposed LDO is stable with an output capacitor of 0.33 µF and no ESR.