DocumentCode
1258536
Title
150 mA LDO with self-adjusting frequency compensation scheme
Author
Chen, Ci ; Wu, J.H. ; Wang, Z.X.
Author_Institution
Nat. ASIC Res. Center, Southeast Univ., Nanjing, China
Volume
47
Issue
13
fYear
2011
Firstpage
767
Lastpage
768
Abstract
A low-drop-out regulator with dynamic biased buffers for self-adjusting frequency compensation is presented. The proposed buffer, based on gm-boost elements, keeps the second pole beyond the unity-gain frequency of the loop by dynamically changing its bias current according to the load condition. The LDO has a quiescent current of 23 μA and is able to deliver 150 mA load current. With wide loop bandwidth and adequate phase margin, improved transient response with 38 mV output variation is achieved under a 0-100 mA load current switching test.
Keywords
buffer circuits; compensation; switching circuits; transient response; voltage regulators; LDO; bias current; current 150 mA; current 23 muA; dynamic biased buffer; gm-boost element; load current switching test; low-dropout regulator; phase margin; quiescent current; self-adjusting frequency compensation scheme; transient response; unity-gain frequency;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2011.0771
Filename
5931013
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