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High-Speed Dynamic Level Shifter for High-Side Bootstrapped Gate Driver in High-Voltage Buck Regulators

Considering the high-voltage dc-dc buck regulator applications, a high-speed dynamic level shifter for high-side bootstrapped gate driver is presented. By introducing an instantaneous dynamic current, the propagation delay of the level shifter is reduced to 0.25 ns for the high-side switch. The dV _...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2021-09, Vol.68 (9), p.3083-3087
Main Authors: Yuan, Bing, Xiao, Lang-Qi, Wang, Bing-Yuan, Ying, Jing
Format: Article
Language:English
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Summary:Considering the high-voltage dc-dc buck regulator applications, a high-speed dynamic level shifter for high-side bootstrapped gate driver is presented. By introducing an instantaneous dynamic current, the propagation delay of the level shifter is reduced to 0.25 ns for the high-side switch. The dV _{SW}/dt immunity and reliability are improved by a clamp circuit during the positive and negative slewing. The maximum dV _{SW}/dt that the proposed circuit can tolerate is up to 18V/ns. The process variation immunity is also enhanced by optimizing the design of bias current generator. The achieved area-efficient level shifter is designed based on thin gate-oxide transistors that are widely used in high-voltage process. Experimental results show that the fabricated regulator with the proposed scheme regulates well with an 18 V input, 3.3 V output, and 2 A load current.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2021.3091629