Integrated Current Sensing Technique Suitable for Step-Down Switch-Mode Power Converters

Xiaojuan XIA  Liang XIE  Weifeng SUN  Longxing SHI  

IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.10   pp.1299-1303
Publication Date: 2009/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.1299
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
current sense,  sense voltage,  SMPC,  on-chip,  

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A new on-chip current sensing circuit suitable for step-down switch-mode power converters (SMPC) is presented in this paper. It can be used in a high speed SMPC. The sense voltage is quite accurate and temperature independent. The structure is very simple. Only eight transistors and a sensing resistor are used. This current sensing technique has been fabricated with a standard 0.5 µm DPDM CMOS process. Experimental results show that the proposed circuit can work well in DC-DC converters such that the loading current can be managed through control theories.