Transient Output-Current Regulator with Background Calibration Applied to a Buck Converter for Fast Load-Transient Response

Yi Wei Huang, Ting Yu Yu, Tai Haur Kuo

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number9205282
Pages (from-to)462-465
Number of pages4
JournalIEEE Solid-State Circuits Letters
Volume3
DOIs
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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