TY - JOUR
T1 - Transient Output-Current Regulator with Background Calibration Applied to a Buck Converter for Fast Load-Transient Response
AU - Huang, Yi Wei
AU - Yu, Ting Yu
AU - Kuo, Tai Haur
N1 - Funding Information:
Manuscript received August 1, 2020; revised September 4, 2020; accepted September 19, 2020. Date of publication September 24, 2020; date of current version October 20, 2020. This article was approved by Associate Editor Po-Chiun Huang. This work was supported by the Ministry of Science and Technology of Taiwan. (Corresponding Author: Tai-Haur Kuo.) The authors are with the Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan (e-mail: thkuo@ee.ncku.edu.tw). Digital Object Identifier 10.1109/LSSC.2020.3026548
PY - 2020
Y1 - 2020
N2 - A transient output-current regulator (TOCR) is presented and merged into a buck converter to achieve fast load-transient response for stepwise load-current I load profiles, leading to small undershoot/overshoot voltage V US/VOS and short settling time t_S in the output voltage VO. The TOCR instantly detects an Iload transient and triggers a compensation current IU/ID. Moreover, background calibration of the IU/ID is proposed to ensure the sum of inductor current IL and IU/ID accurately tracks Iload under PVT variations. The prototype chip, fabricated in a 0.18-μ m CMOS process, occupies 1.88 mm2. Under 0.45-A and 1-A Iload transients, the measured VO remains within 1% of its nominal 1.8 V, with VUS and VOS both being less than 18 mV and a negligible tS. Compared with other state of the arts, this letter achieves the fastest load-transient response with the smallest VUS/VOS and shortest tS.
AB - A transient output-current regulator (TOCR) is presented and merged into a buck converter to achieve fast load-transient response for stepwise load-current I load profiles, leading to small undershoot/overshoot voltage V US/VOS and short settling time t_S in the output voltage VO. The TOCR instantly detects an Iload transient and triggers a compensation current IU/ID. Moreover, background calibration of the IU/ID is proposed to ensure the sum of inductor current IL and IU/ID accurately tracks Iload under PVT variations. The prototype chip, fabricated in a 0.18-μ m CMOS process, occupies 1.88 mm2. Under 0.45-A and 1-A Iload transients, the measured VO remains within 1% of its nominal 1.8 V, with VUS and VOS both being less than 18 mV and a negligible tS. Compared with other state of the arts, this letter achieves the fastest load-transient response with the smallest VUS/VOS and shortest tS.
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U2 - 10.1109/LSSC.2020.3026548
DO - 10.1109/LSSC.2020.3026548
M3 - Article
AN - SCOPUS:85091914004
VL - 3
SP - 462
EP - 465
JO - IEEE Solid-State Circuits Letters
JF - IEEE Solid-State Circuits Letters
SN - 2573-9603
M1 - 9205282
ER -